Repository: meilisearch/meilisearch
File: meilisearch/src/routes/indexes/mod.rs (Rust)

Code before:
pub struct ListIndexes {
    #[deserr(default, error = DeserrQueryParamError<InvalidIndexOffset>)]
    pub offset: Param<usize>,
    #[deserr(default = Param(PAGINATION_DEFAULT_LIMIT), error = DeserrQueryParamError<InvalidIndexLimit>)]
    pub limit: Param<usize>,
}
impl ListIndexes {
    fn as_pagination(self) -> Pagination {
        Pagination { offset: self.offset.0, limit: self.limit.0 }
    }
}

pub async fn list_indexes(
    index_scheduler: GuardedData<ActionPolicy<{ actions::INDEXES_GET }>, Data<IndexScheduler>>,
    paginate: AwebQueryParameter<ListIndexes, DeserrQueryParamError>,
) -> Result<HttpResponse, ResponseError> {
    let filters = index_scheduler.filters();
    let indexes: Vec<Option<IndexView>> =
        index_scheduler.try_for_each_index(|uid, index| -> Result<Option<IndexView>, _> {
            if !filters.is_index_authorized(uid) {
                return Ok(None);
            }
            Ok(Some(IndexView::new(uid.to_string(), index)?))
        })?;
    // Won't cause to open all indexes because IndexView doesn't keep the `Index` opened.
    // error when trying to fix it: the trait `ExactSizeIterator` is not implemented for `Flatten<IntoIter<Option<IndexView>>>`
    let indexes: Vec<IndexView> = indexes.into_iter().flatten().collect();
    let ret = paginate.as_pagination().auto_paginate_sized(indexes.into_iter());

    debug!("returns: {:?}", ret);
    Ok(HttpResponse::Ok().json(ret))
}

#[derive(Deserr, Debug)]
#[deserr(error = DeserrJsonError, rename_all = camelCase, deny_unknown_fields)]
pub struct IndexCreateRequest {
    #[deserr(error = DeserrJsonError<InvalidIndexUid>, missing_field_error = DeserrJsonError::missing_index_uid)]
    uid: IndexUid,
    #[deserr(default, error = DeserrJsonError<InvalidIndexPrimaryKey>)]
    primary_key: Option<String>,
}

pub async fn create_index(
    index_scheduler: GuardedData<ActionPolicy<{ actions::INDEXES_CREATE }>, Data<IndexScheduler>>,
    body: AwebJson<IndexCreateRequest, DeserrJsonError>,
    req: HttpRequest,
    analytics: web::Data<dyn Analytics>,
) -> Result<HttpResponse, ResponseError> {
    let IndexCreateRequest { primary_key, uid } = body.into_inner();

    let allow_index_creation = index_scheduler.filters().allow_index_creation(&uid);

Review comment (refactor):
I think we can remove this line if clippy is not flagging it, otherwise it might be confusing

```suggestion
```

Code after:
pub struct ListIndexes {
    #[deserr(default, error = DeserrQueryParamError<InvalidIndexOffset>)]
    pub offset: Param<usize>,
    #[deserr(default = Param(PAGINATION_DEFAULT_LIMIT), error = DeserrQueryParamError<InvalidIndexLimit>)]
    pub limit: Param<usize>,
}
impl ListIndexes {
    fn as_pagination(self) -> Pagination {
        Pagination { offset: self.offset.0, limit: self.limit.0 }
    }
}

pub async fn list_indexes(
    index_scheduler: GuardedData<ActionPolicy<{ actions::INDEXES_GET }>, Data<IndexScheduler>>,
    paginate: AwebQueryParameter<ListIndexes, DeserrQueryParamError>,
) -> Result<HttpResponse, ResponseError> {
    let filters = index_scheduler.filters();
    let indexes: Vec<Option<IndexView>> =
        index_scheduler.try_for_each_index(|uid, index| -> Result<Option<IndexView>, _> {
            if !filters.is_index_authorized(uid) {
                return Ok(None);
            }
            Ok(Some(IndexView::new(uid.to_string(), index)?))
        })?;
    // Won't cause to open all indexes because IndexView doesn't keep the `Index` opened.
    let indexes: Vec<IndexView> = indexes.into_iter().flatten().collect();
    let ret = paginate.as_pagination().auto_paginate_sized(indexes.into_iter());

    debug!("returns: {:?}", ret);
    Ok(HttpResponse::Ok().json(ret))
}

#[derive(Deserr, Debug)]
#[deserr(error = DeserrJsonError, rename_all = camelCase, deny_unknown_fields)]
pub struct IndexCreateRequest {
    #[deserr(error = DeserrJsonError<InvalidIndexUid>, missing_field_error = DeserrJsonError::missing_index_uid)]
    uid: IndexUid,
    #[deserr(default, error = DeserrJsonError<InvalidIndexPrimaryKey>)]
    primary_key: Option<String>,
}

pub async fn create_index(
    index_scheduler: GuardedData<ActionPolicy<{ actions::INDEXES_CREATE }>, Data<IndexScheduler>>,
    body: AwebJson<IndexCreateRequest, DeserrJsonError>,
    req: HttpRequest,
    analytics: web::Data<dyn Analytics>,
) -> Result<HttpResponse, ResponseError> {
    let IndexCreateRequest { primary_key, uid } = body.into_inner();

    let allow_index_creation = index_scheduler.filters().allow_index_creation(&uid);
    if allow_index_creation {