Support renaming a feature flag via the api

Update documentation and specs

doc/api/feature_flags.md

@@ -96,13 +96,13 @@ Example response:
 Gets a single feature flag.
 
 ```plaintext
-GET /projects/:id/feature_flags/:name
+GET /projects/:id/feature_flags/:feature_flag_name
 ```
 
 | Attribute           | Type             | Required   | Description                                                                            |
 | ------------------- | ---------------- | ---------- | ---------------------------------------------------------------------------------------|
 | `id`                | integer/string   | yes        | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding).       |
-| `name`              | string           | yes        | The name of the feature flag.                                                          |
+| `feature_flag_name` | string           | yes        | The name of the feature flag.                                                          |
 
 ```shell
 curl --header "PRIVATE-TOKEN: <your_access_token>" https://gitlab.example.com/api/v4/projects/1/feature_flags/awesome_feature
@@ -201,15 +201,16 @@ Example response:
 Updates a feature flag.
 
 ```plaintext
-PUT /projects/:id/feature_flags/:name
+PUT /projects/:id/feature_flags/:feature_flag_name
 ```
 
 | Attribute           | Type             | Required   | Description                                                                            |
 | ------------------- | ---------------- | ---------- | ---------------------------------------------------------------------------------------|
 | `id`                | integer/string   | yes        | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding).       |
-| `name`              | string           | yes        | The name of the feature flag.                                                          |
+| `feature_flag_name` | string           | yes        | The current name of the feature flag.                                                  |
 | `description`       | string           | no         | The description of the feature flag.                                                   |
 | `active`            | boolean          | no         | The active state of the flag. [Supported](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/38350) in GitLab 13.3 and later. |
+| `name`              | string           | no         | The new name of the feature flag. [Supported](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/38350) in GitLab 13.3 and later. |
 | `strategies`        | JSON             | no         | The feature flag [strategies](../operations/feature_flags.md#feature-flag-strategies). |
 | `strategies:id`     | JSON             | no         | The feature flag strategy id.                                                          |
 | `strategies:name`   | JSON             | no         | The strategy name.                                                                     |
@@ -275,13 +276,13 @@ Example response:
 Deletes a feature flag.
 
 ```plaintext
-DELETE /projects/:id/feature_flags/:name
+DELETE /projects/:id/feature_flags/:feature_flag_name
 ```
 
 | Attribute           | Type             | Required   | Description                                                                            |
 | ------------------- | ---------------- | ---------- | ---------------------------------------------------------------------------------------|
 | `id`                | integer/string   | yes        | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding).       |
-| `name`              | string           | yes        | The name of the feature flag.  |
+| `feature_flag_name` | string           | yes        | The name of the feature flag.                                                          |
 
 ```shell
 curl --header "PRIVATE-TOKEN: <your_access_token>" --request DELETE "https://gitlab.example.com/api/v4/projects/1/feature_flags/awesome_feature"

ee/changelogs/unreleased/ff-update-name-put.yml

+---
+title: Support renaming feature flags via the api
+merge_request: 38425
+author:
+type: fixed

ee/lib/api/feature_flags.rb

@@ -81,9 +81,9 @@ module API
       end
 
       params do
-        requires :name, type: String, desc: 'The name of the feature flag'
+        requires :feature_flag_name, type: String, desc: 'The name of the feature flag'
       end
-      resource 'feature_flags/:name', requirements: FEATURE_FLAG_ENDPOINT_REQUIREMENTS do
+      resource 'feature_flags/:feature_flag_name', requirements: FEATURE_FLAG_ENDPOINT_REQUIREMENTS do
         desc 'Get a feature flag of a project' do
           detail 'This feature was introduced in GitLab 12.5'
           success EE::API::Entities::FeatureFlag
@@ -145,6 +145,7 @@ module API
           success EE::API::Entities::FeatureFlag
         end
         params do
+          optional :name, type: String, desc: 'The name of the feature flag'
           optional :description, type: String, desc: 'The description of the feature flag'
           optional :active, type: Boolean, desc: 'Active/inactive value of the flag'
           optional :strategies, type: Array do
@@ -237,9 +238,9 @@ module API
 
       def feature_flag
         @feature_flag ||= if feature_flags_new_version_enabled?
-                            user_project.operations_feature_flags.find_by_name!(params[:name])
+                            user_project.operations_feature_flags.find_by_name!(params[:feature_flag_name])
                           else
-                            user_project.operations_feature_flags.legacy_flag.find_by_name!(params[:name])
+                            user_project.operations_feature_flags.legacy_flag.find_by_name!(params[:feature_flag_name])
                           end
       end
 

ee/spec/requests/api/feature_flags_spec.rb

@@ -814,6 +814,17 @@ RSpec.describe API::FeatureFlags do
         expect(feature_flag.reload.active).to eq(false)
       end
 
+      it 'updates the feature flag name' do
+        params = { name: 'new-name' }
+
+        put api("/projects/#{project.id}/feature_flags/feature1", user), params: params
+
+        expect(response).to have_gitlab_http_status(:ok)
+        expect(response).to match_response_schema('public_api/v4/feature_flag', dir: 'ee')
+        expect(json_response['name']).to eq('new-name')
+        expect(feature_flag.reload.name).to eq('new-name')
+      end
+
       it 'ignores a provided version parameter' do
         params = { description: 'other description', version: 'bad_value' }