Add target_path to broadcast API

As a follow-up to the MR that intrduced `target_path` to
`BroadcastMessage`, this MR adds the field to our API.

changelogs/unreleased/nicolasdular-add-broadcast-target-to-api.yml

+---
+title: Add target_path to broadcast message API
+merge_request: 21430
+author:
+type: added

doc/api/broadcast_messages.md

@@ -34,7 +34,8 @@ Example response:
         "color":"#E75E40",
         "font":"#FFFFFF",
         "id":1,
-        "active": false
+        "active": false,
+        "target_path": "*/welcome"
     }
 ]
 ```
@@ -69,7 +70,8 @@ Example response:
     "color":"#cecece",
     "font":"#FFFFFF",
     "id":1,
-    "active":false
+    "active":false,
+    "target_path": "*/welcome"
 }
 ```
 
@@ -107,7 +109,8 @@ Example response:
     "color":"#cecece",
     "font":"#FFFFFF",
     "id":1,
-    "active": true
+    "active": true,
+    "target_path": "*/welcome"
 }
 ```
 
@@ -146,7 +149,8 @@ Example response:
     "color":"#000",
     "font":"#FFFFFF",
     "id":1,
-    "active": true
+    "active": true,
+    "target_path": "*/welcome"
 }
 ```
 

lib/api/broadcast_messages.rb

@@ -37,6 +37,7 @@ module API
         optional :ends_at, type: DateTime, desc: 'Ending time', default: -> { 1.hour.from_now }
         optional :color, type: String, desc: 'Background color'
         optional :font, type: String, desc: 'Foreground color'
+        optional :target_path, type: String, desc: 'Target path'
       end
       post do
         message = BroadcastMessage.create(declared_params(include_missing: false))
@@ -72,6 +73,7 @@ module API
         optional :ends_at, type: DateTime, desc: 'Ending time'
         optional :color, type: String, desc: 'Background color'
         optional :font, type: String, desc: 'Foreground color'
+        optional :target_path, type: String, desc: 'Target path'
       end
       put ':id' do
         message = find_message

lib/api/entities.rb

@@ -1217,7 +1217,7 @@ module API
     end
 
     class BroadcastMessage < Grape::Entity
-      expose :message, :starts_at, :ends_at, :color, :font
+      expose :message, :starts_at, :ends_at, :color, :font, :target_path
     end
 
     class ApplicationStatistics < Grape::Entity

spec/requests/api/broadcast_messages_spec.rb

@@ -29,7 +29,7 @@ describe API::BroadcastMessages do
       expect(response).to include_pagination_headers
       expect(json_response).to be_kind_of(Array)
       expect(json_response.first.keys)
-        .to match_array(%w(id message starts_at ends_at color font active))
+        .to match_array(%w(id message starts_at ends_at color font active target_path))
     end
   end
 
@@ -52,7 +52,7 @@ describe API::BroadcastMessages do
       expect(response).to have_gitlab_http_status(200)
       expect(json_response['id']).to eq message.id
       expect(json_response.keys)
-        .to match_array(%w(id message starts_at ends_at color font active))
+        .to match_array(%w(id message starts_at ends_at color font active target_path))
     end
   end
 
@@ -100,6 +100,15 @@ describe API::BroadcastMessages do
         expect(json_response['color']).to eq attrs[:color]
         expect(json_response['font']).to eq attrs[:font]
       end
+
+      it 'accepts a target path' do
+        attrs = attributes_for(:broadcast_message, target_path: "*/welcome")
+
+        post api('/broadcast_messages', admin), params: attrs
+
+        expect(response).to have_gitlab_http_status(201)
+        expect(json_response['target_path']).to eq attrs[:target_path]
+      end
     end
   end
 
@@ -150,6 +159,15 @@ describe API::BroadcastMessages do
         expect(response).to have_gitlab_http_status(200)
         expect { message.reload }.to change { message.message }.to('new message')
       end
+
+      it 'accepts a new target_path' do
+        attrs = { target_path: '*/welcome' }
+
+        put api("/broadcast_messages/#{message.id}", admin), params: attrs
+
+        expect(response).to have_gitlab_http_status(200)
+        expect(json_response['target_path']).to eq attrs[:target_path]
+      end
     end
   end