Add account_id param to GET /api/v1/notifications (#10796)

* Add `from_account` to notifications API

this adds the ability to filter notifications by the account they
originated from

* passing a non-existent user should cause none to be returned

* Fix codeclimate warnings

* fix more codeclimate warnings

* make requested changes:

* use account id instead of user@domain
* name the param `account_id` instead of `from_account`

* Don't use `return` in a lambda

spec/controllers/api/v1/notifications_controller_spec.rb

@@ -6,6 +6,7 @@ RSpec.describe Api::V1::NotificationsController, type: :controller do
   let(:user)  { Fabricate(:user, account: Fabricate(:account, username: 'alice')) }
   let(:token) { Fabricate(:accessible_access_token, resource_owner_id: user.id, scopes: scopes) }
   let(:other) { Fabricate(:user, account: Fabricate(:account, username: 'bob')) }
+  let(:third) { Fabricate(:user, account: Fabricate(:account, username: 'carol')) }
 
   before do
     allow(controller).to receive(:doorkeeper_token) { token }
@@ -55,6 +56,7 @@ RSpec.describe Api::V1::NotificationsController, type: :controller do
       mentioning_status = PostStatusService.new.call(other.account, text: 'Hello @alice')
       @mention_from_status = mentioning_status.mentions.first
       @favourite = FavouriteService.new.call(other.account, first_status)
+      @second_favourite = FavouriteService.new.call(third.account, first_status)
       @follow = FollowService.new.call(other.account, 'alice')
     end
 
@@ -84,6 +86,66 @@ RSpec.describe Api::V1::NotificationsController, type: :controller do
       end
     end
 
+    describe 'from specified user' do
+      before do
+        get :index, params: { account_id: third.account.id }
+      end
+
+      it 'returns http success' do
+        expect(response).to have_http_status(200)
+      end
+
+      it 'includes favourite' do
+        expect(assigns(:notifications).map(&:activity)).to include(@second_favourite)
+      end
+
+      it 'excludes favourite' do
+        expect(assigns(:notifications).map(&:activity)).to_not include(@favourite)
+      end
+
+      it 'excludes mention' do
+        expect(assigns(:notifications).map(&:activity)).to_not include(@mention_from_status)
+      end
+
+      it 'excludes reblog' do
+        expect(assigns(:notifications).map(&:activity)).to_not include(@reblog_of_first_status)
+      end
+
+      it 'excludes follow' do
+        expect(assigns(:notifications).map(&:activity)).to_not include(@follow)
+      end
+    end
+
+    describe 'from nonexistent user' do
+      before do
+        get :index, params: { account_id: 'foo' }
+      end
+
+      it 'returns http success' do
+        expect(response).to have_http_status(200)
+      end
+
+      it 'excludes favourite' do
+        expect(assigns(:notifications).map(&:activity)).to_not include(@favourite)
+      end
+
+      it 'excludes second favourite' do
+        expect(assigns(:notifications).map(&:activity)).to_not include(@second_favourite)
+      end
+
+      it 'excludes mention' do
+        expect(assigns(:notifications).map(&:activity)).to_not include(@mention_from_status)
+      end
+
+      it 'excludes reblog' do
+        expect(assigns(:notifications).map(&:activity)).to_not include(@reblog_of_first_status)
+      end
+
+      it 'excludes follow' do
+        expect(assigns(:notifications).map(&:activity)).to_not include(@follow)
+      end
+    end
+
     describe 'with excluded mentions' do
       before do
         get :index, params: { exclude_types: ['mention'] }
@@ -105,6 +167,10 @@ RSpec.describe Api::V1::NotificationsController, type: :controller do
         expect(assigns(:notifications).map(&:activity)).to include(@favourite)
       end
 
+      it 'includes third favourite' do
+        expect(assigns(:notifications).map(&:activity)).to include(@second_favourite)
+      end
+
       it 'includes follow' do
         expect(assigns(:notifications).map(&:activity)).to include(@follow)
       end