rails generate model tag name:string:uniq --no-timestamps
Migrate schema to version: 8
Add Tag factory definition
Add initial spec for Tag model
rails generate model tag_relation entry:references tag:references --no-timestamps
Migrate schema to version: 9
Entry has many Tag models
Edit Entry#tags
Add underscore.js to vendor javascripts
Make Underscore.js compatible with ERB
Add new tag interactive
Check the checkbox when exist tag inputted
Reject empty name tags
Ignore empty new tag name
Build form controls which to add new tag
Tag should have present #name
Do not query in views
Retrieve templates content as HTML

Retrieve as HTML (element object) is safe
Merge pull request #1 from aereal/feature/tagging

タグ付け