Repository: Space2Study-UA-1355-02/BackEnd-02
Pull request #20: #100: Implement "GetCategoryById" endpoint.
Author: login: Kryzhanivsky
Created: 2025-05-05T10:21:25Z | Merged: 2025-05-06T09:16:58Z



<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Added the ability to retrieve a single category by its unique ID through a new endpoint.
- **Documentation**
  - Updated API documentation to include details for the new endpoint to fetch a category by ID, including parameters and possible responses.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->


Diff:
diff --git a/src/controllers/category.js b/src/controllers/category.js
index 229d5b7..c8ec8b4 100644
--- a/src/controllers/category.js
+++ b/src/controllers/category.js
@@ -1,7 +1,13 @@
+
+const mongoose = require('mongoose')
+
 const categoryService = require('~/services/category')
 
+const { createBadRequestError, createNotFoundError } = require('~/utils/errorsHelper')
+
 const { DEFAULT_CATEGORY_LIMIT, DEFAULT_CATEGORY_SKIP } = require('~/consts/category')
 
+
 const createCategory = async (req, res) => {
   const categoryData = req.body
 
@@ -10,6 +16,22 @@ const createCategory = async (req, res) => {
   res.status(201).json(newCategory)
 }
 
+const getCategoryById = async (req, res) => {
+  const id = req.params.id
+
+  if (!mongoose.Types.ObjectId.isValid(id)) {
+    throw createBadRequestError()
+  }
+
+  const category = await categoryService.getCategoryById(id)
+
+  if (!category) {
+    throw createNotFoundError()
+  }
+
+  res.status(200).json(category)
+}
+
 const getCategoryNames = async (req, res) => {
   const { limit, skip, sort, categories, name } = req.query
 
@@ -41,6 +63,7 @@ const getCategories = async (req, res) => {
 
 module.exports = {
   createCategory,
+  getCategories,
   getCategoryNames,
-  getCategories
+  getCategoryById
 }
diff --git a/src/routes/categories.js b/src/routes/categories.js
index f16e93f..0adb859 100644
--- a/src/routes/categories.js
+++ b/src/routes/categories.js
@@ -11,6 +11,7 @@ const {
 
 router.use(authMiddleware)
 router.get('/', asyncWrapper(categoryController.getCategories))
+router.get('/:id', asyncWrapper(categoryController.getCategoryById))
 router.get('/names', asyncWrapper(categoryController.getCategoryNames))
 
 router.use(restrictTo(ADMIN))
diff --git a/src/services/category.js b/src/services/category.js
index b487a7b..bdaa3eb 100644
--- a/src/services/category.js
+++ b/src/services/category.js
@@ -1,4 +1,5 @@
 const Category = require('~/models/category')
+
 const { createError } = require('~/utils/errorsHelper')
 
 const { DOCUMENT_ALREADY_EXISTS } = require('~/consts/errors')
@@ -24,6 +25,10 @@ const categoryService = {
       }
     })
   },
+  
+  getCategoryById: async (id) => {
+    return await Category.findById(id)
+  }
 
   getCategoryNames: async (limit, skip, sortOptions, categories, name) => {
     const query = {}
diff --git a/src/utils/docs/category.yaml b/src/utils/docs/category.yaml
index bd82b10..c3122ea 100644
--- a/src/utils/docs/category.yaml
+++ b/src/utils/docs/category.yaml
@@ -109,6 +109,37 @@ paths:
         '401':
           description: Unauthorized – authentication required
 
+  /categories/{id}:
+    get:
+      tags:
+        - Category
+      summary: Get category by ID
+      description: Returns a category by its unique ID.
+      security:
+        - bearerAuth: [ ]
+        - cookieAuth: [ ]
+      parameters:
+        - name: id
+          in: path
+          required: true
+          description: The ID of the category to retrieve
+          schema:
+            type: string
+            example: 60d21b4667d0d8992e610c85
+      responses:
+        '200':
+          description: Successfully retrieved the category
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Category'
+        '400':
+          description: Invalid ID format
+        '401':
+          description: Unauthorized – authentication required
+        '404':
+          description: Category not found
+
   /categories/names:
     get:
       tags:
@@ -182,7 +213,6 @@ paths:
         '401':
           description: Unauthorized – authentication required
 
-
 components:
   securitySchemes:
     bearerAuth:
@@ -193,6 +223,7 @@ components:
       type: apiKey
       in: cookie
       name: accessToken
+      
   schemas:
     CategoryAppearance:
       type: object


Reviews:
user: login: coderabbitai[bot]
body: **Actionable comments posted: 5**

<details>
<summary>🧹 Nitpick comments (9)</summary><blockquote>

<details>
<summary>src/consts/validation.js (1)</summary><blockquote>

`11-12`: **LGTM, but add a trailing comma for consistency.**

The implementation of the hex color code pattern is correct, supporting both 3-digit and 6-digit formats with an optional # prefix.



```diff
  NAME_PATTERN: /^[a-zа-яєії]+$/i,
- HEX_COLOR_CODE_PATTERN: /^#(?:[0-9a-fA-F]{3}|[0-9a-fA-F]{6})$/i
+ HEX_COLOR_CODE_PATTERN: /^#(?:[0-9a-fA-F]{3}|[0-9a-fA-F]{6})$/i,
```

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<details>
<summary>src/routes/categories.js (1)</summary><blockquote>

`1-18`: **LGTM! Consider adding an endpoint to retrieve all categories.**

The router is well structured with proper authentication and role-based access control. The GET endpoint for retrieving a category by ID is accessible to all authenticated users, while the POST endpoint for creating categories is restricted to admin users.



Consider adding a GET endpoint for retrieving all categories, which is a common pattern for resource collections:

```diff
router.use(authMiddleware)
router.get('/:id', asyncWrapper(categoryController.getCategoryById))
+ router.get('/', asyncWrapper(categoryController.getAllCategories))

router.use(restrictTo(ADMIN))
router.post('/', asyncWrapper(categoryController.createCategory))
```

This would require implementing the `getAllCategories` controller method.

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<details>
<summary>src/controllers/category.js (1)</summary><blockquote>

`7-13`: **Add input validation before calling the service**

Currently, the function passes the entire request body to the service without validation. Consider adding some basic validation to ensure the request contains the required fields.


```diff
 const createCategory = async (req, res) => {
-  const categoryData = req.body
+  try {
+    const { name, appearance } = req.body
+    
+    if (!name) {
+      throw createBadRequestError('Category name is required')
+    }
+    
+    if (!appearance) {
+      throw createBadRequestError('Category appearance is required')
+    }
 
-  const newCategory = await categoryService.createCategory(categoryData)
+    const newCategory = await categoryService.createCategory({ name, appearance })
 
-  res.status(201).json(newCategory)
+    res.status(201).json(newCategory)
+  } catch (error) {
+    next(error)
+  }
 }
```

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<details>
<summary>src/models/category.js (2)</summary><blockquote>

`15-36`: **Add timestamps to the schema**

Consider adding timestamps to track when categories are created or modified. This is useful for auditing and can be easily added to Mongoose schemas.


```diff
 const categorySchema = new Schema({
   name: {
     type: String,
     required: [true, FIELD_CANNOT_BE_EMPTY('name')],
     unique: [true, DOCUMENT_ALREADY_EXISTS('name')],
     minLength: [1, FIELD_CANNOT_BE_SHORTER('name', 1)],
     maxLength: [150, FIELD_CANNOT_BE_LONGER('name', 150)]
   },
   appearance: {
     icon: {
       type: String,
       required: [true, FIELD_CANNOT_BE_EMPTY('icon')],
       default: DEFAULT_CATEGORY_ICON
     },
     color: {
       type: String,
       required: [true, FIELD_CANNOT_BE_EMPTY('color')],
       match: [HEX_COLOR_CODE_PATTERN, 'Invalid color format, must be a hex color code'],
       default: DEFAULT_CATEGORY_ICON_COLOR
     }
   }
+}, {
+  timestamps: true
 })
```

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`38-38`: **Consider creating an index on the `name` field**

Since you're querying by name in the service and have a unique constraint on it, it's a good practice to create an index on this field for better performance.


```diff
+// Create index on name field for faster queries
+categorySchema.index({ name: 1 });
+
 module.exports = model(CATEGORY, categorySchema)
```

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<summary>src/services/category.js (2)</summary><blockquote>

`20-27`: **Remove unnecessary `await` in the return statement**

The `await` in `return await Category.create(...)` is redundant as `Category.create` already returns a Promise. Removing it would slightly improve performance.


```diff
-    return await Category.create({
+    return Category.create({
       name,
       appearance: {
         icon,
         color
       }
     })
```

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`28-30`: **Remove unnecessary `await` in the return statement**

Similar to the previous comment, the `await` in `return await Category.findById(id)` is redundant.


```diff
   getCategoryById: async (id) => {
-    return await Category.findById(id)
+    return Category.findById(id)
   }
```

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<summary>src/utils/docs/category.yaml (2)</summary><blockquote>

`91-91`: **Add newline at end of file**

According to YAMLlint, the file is missing a newline character at the end, which is a common convention for source files.


```diff
       required:
         - name
         - appearance
+
```

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[error] 91-91: no new line character at the end of file

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---

`73-91`: **Update Category schema if timestamps are added**

If you decide to add timestamps to the Mongoose schema as suggested, the OpenAPI schema should be updated to include these fields for consistency.


```diff
     Category:
       type: object
       properties:
         _id:
           type: string
           description: Unique category identifier
           example: 60d21b4667d0d8992e610c85
         name:
           type: string
           description: Category name
           minLength: 1
           maxLength: 150
           example: "Language"
         appearance:
           $ref: '#/components/schemas/CategoryAppearance'
+        createdAt:
+          type: string
+          format: date-time
+          description: Timestamp when the category was created
+          example: "2023-05-21T14:30:00Z"
+        updatedAt:
+          type: string
+          format: date-time
+          description: Timestamp when the category was last updated
+          example: "2023-05-21T14:30:00Z"
       required:
         - name
         - appearance
```

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<details>
<summary>📜 Review details</summary>

**Configuration used: CodeRabbit UI**
**Review profile: CHILL**
**Plan: Pro**

<details>
<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between ddae3c99688e81e332a27b7307f14c922f17f071 and 36fa2c2a594cd5234ee19268ff5ff6bf4ab67d85.

</details>

<details>
<summary>📒 Files selected for processing (9)</summary>

* `src/consts/category.js` (1 hunks)
* `src/consts/models.js` (1 hunks)
* `src/consts/validation.js` (1 hunks)
* `src/controllers/category.js` (1 hunks)
* `src/models/category.js` (1 hunks)
* `src/routes/categories.js` (1 hunks)
* `src/routes/index.js` (2 hunks)
* `src/services/category.js` (1 hunks)
* `src/utils/docs/category.yaml` (1 hunks)

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<summary>🧬 Code Graph Analysis (3)</summary>

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<summary>src/models/category.js (1)</summary><blockquote>

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<summary>src/consts/category.js (2)</summary>

* `DEFAULT_CATEGORY_ICON` (1-1)
* `DEFAULT_CATEGORY_ICON_COLOR` (3-3)

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<summary>src/routes/categories.js (1)</summary><blockquote>

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<summary>src/middlewares/auth.js (2)</summary>

* `authMiddleware` (4-10)
* `restrictTo` (12-19)

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<summary>src/services/category.js (1)</summary><blockquote>

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<summary>src/utils/errorsHelper.js (1)</summary>

* `createError` (3-9)

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<summary>🪛 YAMLlint (1.35.1)</summary>

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<summary>src/utils/docs/category.yaml</summary>

[error] 91-91: no new line character at the end of file

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<details>
<summary>🔇 Additional comments (5)</summary><blockquote>

<details>
<summary>src/routes/index.js (2)</summary>

`11-11`: **LGTM!**

The categories route is properly imported.

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---

`21-21`: **LGTM!**

The categories router is properly mounted at '/categories'.

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<details>
<summary>src/consts/models.js (1)</summary>

`15-16`: **LGTM!**

The category model constant is properly defined, and the trailing comma was added to the previous entry.

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<details>
<summary>src/consts/category.js (1)</summary>

`1-8`: **LGTM!**

The default category constants are well defined. The default color '#66C42C' is a valid hex color code that meets the regex pattern defined in validation.js.

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<summary>🪛 ESLint</summary>

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<details>
<summary>src/controllers/category.js (1)</summary>

`1-5`: _⚠️ Potential issue_

**Missing `next` parameter import**

The error throwing in your controller functions implicitly relies on Express's error handling middleware, but the `next` parameter is not included in the function signatures.


```diff
 const mongoose = require('mongoose')
 
 const categoryService = require('~/services/category')
 
 const { createBadRequestError, createNotFoundError } = require('~/utils/errorsHelper')
```

Remember to add the `next` parameter to both function signatures and pass the errors to it.



> Likely an incorrect or invalid review comment.

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</details>

<!-- This is an auto-generated comment by CodeRabbit for review status -->
state: COMMENTED
author_association: NONE
submitted_at: 2025-05-05T10:26:38Z
user: login: coderabbitai[bot]
body: **Actionable comments posted: 0**

<details>
<summary>♻️ Duplicate comments (1)</summary><blockquote>

<details>
<summary>src/utils/docs/category.yaml (1)</summary><blockquote>

`48-57`: **GET endpoint documentation now included**  
The spec correctly defines the GET `/categories/{id}` path with the `id` path parameter, security schemes, and the expected responses (`200`, `400`, `401`, `404`). This resolves the earlier feedback about missing GET docs.

</blockquote></details>

</blockquote></details>

<details>
<summary>🧹 Nitpick comments (1)</summary><blockquote>

<details>
<summary>src/utils/docs/category.yaml (1)</summary><blockquote>

`122-122`: **Add newline at end of file**  
YAML files should end with a newline to satisfy linting rules and POSIX conventions. Please add an empty line after the last line.

<details>
<summary>🧰 Tools</summary>

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<summary>🪛 YAMLlint (1.35.1)</summary>

[error] 122-122: no new line character at the end of file

(new-line-at-end-of-file)

</details>

</details>

</blockquote></details>

</blockquote></details>

<details>
<summary>📜 Review details</summary>

**Configuration used: CodeRabbit UI**
**Review profile: CHILL**
**Plan: Pro**

<details>
<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between 36fa2c2a594cd5234ee19268ff5ff6bf4ab67d85 and ec926c2c47282ec57da614a667bb2d52ae241f15.

</details>

<details>
<summary>📒 Files selected for processing (1)</summary>

* `src/utils/docs/category.yaml` (1 hunks)

</details>

<details>
<summary>🧰 Additional context used</summary>

<details>
<summary>🪛 YAMLlint (1.35.1)</summary>

<details>
<summary>src/utils/docs/category.yaml</summary>

[error] 122-122: no new line character at the end of file

(new-line-at-end-of-file)

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</details>

</details>

<!-- This is an auto-generated comment by CodeRabbit for review status -->
state: COMMENTED
author_association: NONE
submitted_at: 2025-05-05T10:44:14Z
user: login: vlad-khrychov
state: APPROVED
author_association: NONE
submitted_at: 2025-05-05T14:56:09Z

Review comments:
diff_hunk: @@ -0,0 +1,34 @@
+const mongoose = require('mongoose')
+
+const categoryService = require('~/services/category')
+
+const { createBadRequestError, createNotFoundError } = require('~/utils/errorsHelper')
+
+const createCategory = async (req, res) => {
+  const categoryData = req.body
+
+  const newCategory = await categoryService.createCategory(categoryData)
+
+  res.status(201).json(newCategory)
+}
path: src/controllers/category.js
user: login: coderabbitai[bot]
body: _🛠️ Refactor suggestion_

**Add error handling to `createCategory` function**

The function is missing try-catch error handling. Since the service call could throw errors (like the 409 conflict error for duplicate names), these should be properly caught and handled.


```diff
 const createCategory = async (req, res) => {
-  const categoryData = req.body
+  try {
+    const categoryData = req.body
 
-  const newCategory = await categoryService.createCategory(categoryData)
+    const newCategory = await categoryService.createCategory(categoryData)
 
-  res.status(201).json(newCategory)
+    res.status(201).json(newCategory)
+  } catch (error) {
+    next(error)
+  }
 }
```


> Committable suggestion skipped: line range outside the PR's diff.

<details>
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<!-- This is an auto-generated comment by CodeRabbit -->
created_at: 2025-05-05T10:26:36Z
author_association: NONE
diff_hunk: @@ -0,0 +1,34 @@
+const mongoose = require('mongoose')
+
+const categoryService = require('~/services/category')
+
+const { createBadRequestError, createNotFoundError } = require('~/utils/errorsHelper')
+
+const createCategory = async (req, res) => {
+  const categoryData = req.body
+
+  const newCategory = await categoryService.createCategory(categoryData)
+
+  res.status(201).json(newCategory)
+}
+
+const getCategoryById = async (req, res) => {
+  const id = req.params.id
+
+  if (!mongoose.Types.ObjectId.isValid(id)) {
+    throw createBadRequestError()
+  }
+
+  const category = await categoryService.getCategoryById(id)
+
+  if (!category) {
+    throw createNotFoundError()
+  }
+
+  res.status(200).json(category)
+}
path: src/controllers/category.js
user: login: coderabbitai[bot]
body: _🛠️ Refactor suggestion_

**Add error handling to `getCategoryById` function**

Similar to the `createCategory` function, this function lacks proper error handling with try-catch. Also, since the function signature uses the `next` parameter implicitly when throwing errors, it should be included in the parameter list.


```diff
-const getCategoryById = async (req, res) => {
+const getCategoryById = async (req, res, next) => {
   const id = req.params.id
 
-  if (!mongoose.Types.ObjectId.isValid(id)) {
-    throw createBadRequestError()
-  }
-
-  const category = await categoryService.getCategoryById(id)
-
-  if (!category) {
-    throw createNotFoundError()
-  }
-
-  res.status(200).json(category)
+  try {
+    if (!mongoose.Types.ObjectId.isValid(id)) {
+      throw createBadRequestError('Invalid category ID format')
+    }
+
+    const category = await categoryService.getCategoryById(id)
+
+    if (!category) {
+      throw createNotFoundError('Category not found')
+    }
+
+    res.status(200).json(category)
+  } catch (error) {
+    next(error)
+  }
 }
```


<!-- suggestion_start -->

<details>
<summary>📝 Committable suggestion</summary>

> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

`````suggestion
const getCategoryById = async (req, res, next) => {
  const id = req.params.id

  try {
    if (!mongoose.Types.ObjectId.isValid(id)) {
      throw createBadRequestError('Invalid category ID format')
    }

    const category = await categoryService.getCategoryById(id)

    if (!category) {
      throw createNotFoundError('Category not found')
    }

    res.status(200).json(category)
  } catch (error) {
    next(error)
  }
}
`````

</details>

<!-- suggestion_end -->

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<!-- This is an auto-generated comment by CodeRabbit -->
created_at: 2025-05-05T10:26:36Z
author_association: NONE
diff_hunk: @@ -0,0 +1,38 @@
+const { Schema, model } = require('mongoose')
+
+const { DEFAULT_CATEGORY_ICON, DEFAULT_CATEGORY_ICON_COLOR } = require('~/consts/category')
+const {
+  FIELD_CANNOT_BE_EMPTY,
+  DOCUMENT_ALREADY_EXISTS,
+  FIELD_CANNOT_BE_SHORTER,
+  FIELD_CANNOT_BE_LONGER
+} = require('~/consts/errors')
+const { CATEGORY } = require('~/consts/models')
+const {
+  regex: { HEX_COLOR_CODE_PATTERN }
+} = require('~/consts/validation')
+
+const categorySchema = new Schema({
+  name: {
+    type: String,
+    required: [true, FIELD_CANNOT_BE_EMPTY('name')],
+    unique: [true, DOCUMENT_ALREADY_EXISTS('name')],
+    minLength: [1, FIELD_CANNOT_BE_SHORTER('name', 1)],
+    maxLength: [150, FIELD_CANNOT_BE_LONGER('name', 150)]
+  },
+  appearance: {
+    icon: {
+      type: String,
+      required: [true, FIELD_CANNOT_BE_EMPTY('icon')],
+      default: DEFAULT_CATEGORY_ICON
+    },
+    color: {
+      type: String,
+      required: [true, FIELD_CANNOT_BE_EMPTY('color')],
+      regex: HEX_COLOR_CODE_PATTERN,
+      default: DEFAULT_CATEGORY_ICON_COLOR
+    }
path: src/models/category.js
user: login: coderabbitai[bot]
body: _⚠️ Potential issue_

**Use `match` instead of `regex` for MongoDB validation**

Mongoose uses the `match` property for regex validation, not `regex`. This could cause the color validation to be silently ignored.


```diff
     color: {
       type: String,
       required: [true, FIELD_CANNOT_BE_EMPTY('color')],
-      regex: HEX_COLOR_CODE_PATTERN,
+      match: [HEX_COLOR_CODE_PATTERN, 'Invalid color format, must be a hex color code'],
       default: DEFAULT_CATEGORY_ICON_COLOR
     }
```


<!-- suggestion_start -->

<details>
<summary>📝 Committable suggestion</summary>

> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

`````suggestion
    color: {
      type: String,
      required: [true, FIELD_CANNOT_BE_EMPTY('color')],
      match: [HEX_COLOR_CODE_PATTERN, 'Invalid color format, must be a hex color code'],
      default: DEFAULT_CATEGORY_ICON_COLOR
    }
`````

</details>

<!-- suggestion_end -->

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 ESLint</summary>

[error] 29-30: Expected linebreaks to be 'CRLF' but found 'LF'.

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[error] 33-34: Expected linebreaks to be 'CRLF' but found 'LF'.

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</details>

</details>

<!-- This is an auto-generated comment by CodeRabbit -->
created_at: 2025-05-05T10:26:36Z
author_association: NONE
diff_hunk: @@ -0,0 +1,33 @@
+const Category = require('~/models/category')
+
+const { createError } = require('~/utils/errorsHelper')
+
+const { DOCUMENT_ALREADY_EXISTS } = require('~/consts/errors')
+
+const categoryService = {
+  createCategory: async (data) => {
+    const {
+      name,
+      appearance: { icon, color }
+    } = data
+
+    const duplicate = await Category.findOne({ name })
+
+    if (duplicate) {
+      throw createError(409, DOCUMENT_ALREADY_EXISTS('name'))
+    }
+
+    return await Category.create({
+      name,
+      appearance: {
+        icon,
+        color
+      }
+    })
+  },
path: src/services/category.js
user: login: coderabbitai[bot]
body: _🛠️ Refactor suggestion_

**Add validation for the input structure**

The service doesn't validate the structure of the input data before destructuring it, which could lead to runtime errors if `appearance` is missing or null.


```diff
 createCategory: async (data) => {
+    if (!data || !data.name || !data.appearance) {
+      throw createError(400, { message: 'Invalid category data' })
+    }
+
     const {
       name,
       appearance: { icon, color }
     } = data
 
     const duplicate = await Category.findOne({ name })
 
     if (duplicate) {
       throw createError(409, DOCUMENT_ALREADY_EXISTS('name'))
     }
 
     return await Category.create({
       name,
       appearance: {
         icon,
         color
       }
     })
   },
```


<!-- suggestion_start -->

<details>
<summary>📝 Committable suggestion</summary>

> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

`````suggestion
  createCategory: async (data) => {
    if (!data || !data.name || !data.appearance) {
      throw createError(400, { message: 'Invalid category data' })
    }

    const {
      name,
      appearance: { icon, color }
    } = data

    const duplicate = await Category.findOne({ name })

    if (duplicate) {
      throw createError(409, DOCUMENT_ALREADY_EXISTS('name'))
    }

    return await Category.create({
      name,
      appearance: {
        icon,
        color
      }
    })
  },
`````

</details>

<!-- suggestion_end -->

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 ESLint</summary>

[error] 8-9: Expected linebreaks to be 'CRLF' but found 'LF'.

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---

[error] 9-10: Expected linebreaks to be 'CRLF' but found 'LF'.

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[error] 15-16: Expected linebreaks to be 'CRLF' but found 'LF'.

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[error] 16-17: Expected linebreaks to be 'CRLF' but found 'LF'.

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[error] 17-18: Expected linebreaks to be 'CRLF' but found 'LF'.

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[error] 18-19: Expected linebreaks to be 'CRLF' but found 'LF'.

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[error] 19-20: Expected linebreaks to be 'CRLF' but found 'LF'.

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[error] 20-21: Expected linebreaks to be 'CRLF' but found 'LF'.

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[error] 21-22: Expected linebreaks to be 'CRLF' but found 'LF'.

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[error] 22-23: Expected linebreaks to be 'CRLF' but found 'LF'.

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[error] 23-24: Expected linebreaks to be 'CRLF' but found 'LF'.

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[error] 24-25: Expected linebreaks to be 'CRLF' but found 'LF'.

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[error] 25-26: Expected linebreaks to be 'CRLF' but found 'LF'.

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---

[error] 26-27: Expected linebreaks to be 'CRLF' but found 'LF'.

(linebreak-style)

</details>

</details>

<!-- This is an auto-generated comment by CodeRabbit -->
created_at: 2025-05-05T10:26:37Z
author_association: NONE
diff_hunk: @@ -0,0 +1,91 @@
+tags:
+  - name: Categories
+    description: Endpoints for managing categories
+
+paths:
+  /categories:
+    post:
+      tags:
+        - Categories
+      summary: Create a new category
+      description: Allows an admin to create a new category.
+      security:
+        - bearerAuth: [ ]
+        - cookieAuth: [ ]
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              required:
+                - name
+                - appearance
+              properties:
+                name:
+                  type: string
+                  minLength: 1
+                  maxLength: 150
+                  example: "Language"
+                appearance:
+                  $ref: '#/components/schemas/CategoryAppearance'
+      responses:
+        '201':
+          description: Category successfully created
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Category'
+        '400':
+          description: Invalid request payload
+        '401':
+          description: Unauthorized – authentication required
+        '403':
+          description: Forbidden – admin role required
+        '409':
+          description: Category with the same name already exists
path: src/utils/docs/category.yaml
user: login: coderabbitai[bot]
body: _🛠️ Refactor suggestion_

**Add GET endpoint documentation**

The OpenAPI specification only documents the POST endpoint, but the controller also implements a GET endpoint for retrieving a category by ID. Consider adding documentation for this endpoint to ensure complete API documentation.


```diff
 paths:
   /categories:
     post:
       tags:
         - Categories
       summary: Create a new category
       description: Allows an admin to create a new category.
       security:
         - bearerAuth: [ ]
         - cookieAuth: [ ]
       requestBody:
         required: true
         content:
           application/json:
             schema:
               type: object
               required:
                 - name
                 - appearance
               properties:
                 name:
                   type: string
                   minLength: 1
                   maxLength: 150
                   example: "Language"
                 appearance:
                   $ref: '#/components/schemas/CategoryAppearance'
       responses:
         '201':
           description: Category successfully created
           content:
             application/json:
               schema:
                 $ref: '#/components/schemas/Category'
         '400':
           description: Invalid request payload
         '401':
           description: Unauthorized – authentication required
         '403':
           description: Forbidden – admin role required
         '409':
           description: Category with the same name already exists
+
+  /categories/{id}:
+    get:
+      tags:
+        - Categories
+      summary: Get a category by ID
+      description: Retrieves a category by its unique identifier.
+      security:
+        - bearerAuth: [ ]
+        - cookieAuth: [ ]
+      parameters:
+        - name: id
+          in: path
+          required: true
+          description: Category unique identifier
+          schema:
+            type: string
+      responses:
+        '200':
+          description: Category successfully retrieved
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Category'
+        '400':
+          description: Invalid category ID format
+        '401':
+          description: Unauthorized – authentication required
+        '404':
+          description: Category not found
```


<!-- suggestion_start -->

<details>
<summary>📝 Committable suggestion</summary>

> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

`````suggestion
tags:
  - name: Categories
    description: Endpoints for managing categories

paths:
  /categories:
    post:
      tags:
        - Categories
      summary: Create a new category
      description: Allows an admin to create a new category.
      security:
        - bearerAuth: [ ]
        - cookieAuth: [ ]
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - name
                - appearance
              properties:
                name:
                  type: string
                  minLength: 1
                  maxLength: 150
                  example: "Language"
                appearance:
                  $ref: '#/components/schemas/CategoryAppearance'
      responses:
        '201':
          description: Category successfully created
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Category'
        '400':
          description: Invalid request payload
        '401':
          description: Unauthorized – authentication required
        '403':
          description: Forbidden – admin role required
        '409':
          description: Category with the same name already exists

  /categories/{id}:
    get:
      tags:
        - Categories
      summary: Get a category by ID
      description: Retrieves a category by its unique identifier.
      security:
        - bearerAuth: [ ]
        - cookieAuth: [ ]
      parameters:
        - name: id
          in: path
          required: true
          description: Category unique identifier
          schema:
            type: string
      responses:
        '200':
          description: Category successfully retrieved
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Category'
        '400':
          description: Invalid category ID format
        '401':
          description: Unauthorized – authentication required
        '404':
          description: Category not found
`````

</details>

<!-- suggestion_end -->

<!-- This is an auto-generated comment by CodeRabbit -->

✅ Addressed in commit ec926c2
created_at: 2025-05-05T10:26:37Z
author_association: NONE

PR comments:
user: login: coderabbitai[bot]
created_at: 2025-05-05T10:21:32Z
body: <!-- This is an auto-generated comment: summarize by coderabbit.ai -->
<!-- This is an auto-generated comment: failure by coderabbit.ai -->

> [!CAUTION]
> ## Review failed
> 
> The pull request is closed.

<!-- end of auto-generated comment: failure by coderabbit.ai -->
<!-- walkthrough_start -->

## Walkthrough

A new feature is introduced to support fetching a single category by its ID. This includes adding a controller method, service function, route handler, and OpenAPI documentation for the new GET `/categories/{id}` endpoint. The implementation includes input validation and proper error handling for invalid IDs and missing categories.

## Changes

| File(s)                                         | Change Summary                                                                                                   |
|-------------------------------------------------|------------------------------------------------------------------------------------------------------------------|
| src/controllers/category.js                     | Added `getCategoryById` controller: validates ID, fetches category, handles errors, and updates exports.         |
| src/services/category.js                        | Added `getCategoryById` service method to fetch a category by its ID.                                            |
| src/routes/categories.js                        | Added new GET `/:id` route, protected by authentication, mapped to the new controller method.                     |
| src/utils/docs/category.yaml                    | Documented new GET `/categories/{id}` endpoint with parameters, responses, and authentication requirements.       |

## Sequence Diagram(s)

```mermaid
sequenceDiagram
    participant Client
    participant Router
    participant Controller
    participant Service
    participant Database

    Client->>Router: GET /categories/{id}
    Router->>Controller: getCategoryById(req, res)
    Controller->>Controller: Validate ID
    alt ID invalid
        Controller-->>Client: 400 Bad Request
    else ID valid
        Controller->>Service: getCategoryById(id)
        Service->>Database: Category.findById(id)
        Database-->>Service: Category | null
        Service-->>Controller: Category | null
        alt Category not found
            Controller-->>Client: 404 Not Found
        else Category found
            Controller-->>Client: 200 OK + Category JSON
        end
    end
```

## Possibly related PRs

- [Space2Study-UA-1355-02/BackEnd-02#14](https://github.com/Space2Study-UA-1355-02/BackEnd-02/pull/14): Introduces the initial Mongoose category model and constants, which are foundational for the new "get by ID" feature.

## Suggested reviewers

- olena-kuziaieva
- Don-de-padlo
- ruslansymonenko
- Sergij95
- vlad-khrychov

## Poem

> A hop and a leap, a new route appears,  
> Categories by ID—now greeted with cheers!  
> Controllers and services, working in sync,  
> Docs and routes updated in a blink.  
> With paws on the keys, this rabbit’s delight:  
> Fetch your category, now by its unique byte!  
> 🐇✨

<!-- walkthrough_end -->
<!-- internal state start -->


<!-- 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 -->

<!-- internal state end -->

---

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<summary>📜 Recent review details</summary>

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<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between ec926c2c47282ec57da614a667bb2d52ae241f15 and fe5a1f7896bbc0616df38bfe94640fb1a58c3d0d.

</details>

<details>
<summary>📒 Files selected for processing (4)</summary>

* `src/controllers/category.js` (3 hunks)
* `src/routes/categories.js` (1 hunks)
* `src/services/category.js` (2 hunks)
* `src/utils/docs/category.yaml` (2 hunks)

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</details>

<!-- tips_end -->
author_association: NONE
user: login: sonarqubecloud[bot]
created_at: 2025-05-06T09:16:49Z
body: ## [![Quality Gate Passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/qg-passed-20px.png 'Quality Gate Passed')](https://sonarcloud.io/dashboard?id=Space2Study-UA-1355-02_BackEnd-02&pullRequest=20) **Quality Gate passed**  
Issues  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 New issues](https://sonarcloud.io/project/issues?id=Space2Study-UA-1355-02_BackEnd-02&pullRequest=20&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/accepted-16px.png '') [0 Accepted issues](https://sonarcloud.io/project/issues?id=Space2Study-UA-1355-02_BackEnd-02&pullRequest=20&issueStatuses=ACCEPTED)

Measures  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=Space2Study-UA-1355-02_BackEnd-02&pullRequest=20&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0.0% Coverage on New Code](https://sonarcloud.io/component_measures?id=Space2Study-UA-1355-02_BackEnd-02&pullRequest=20&metric=new_coverage&view=list)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0.0% Duplication on New Code](https://sonarcloud.io/component_measures?id=Space2Study-UA-1355-02_BackEnd-02&pullRequest=20&metric=new_duplicated_lines_density&view=list)  
  
[See analysis details on SonarQube Cloud](https://sonarcloud.io/dashboard?id=Space2Study-UA-1355-02_BackEnd-02&pullRequest=20)


author_association: NONE