DeploymentsSerializer can serialize arrays properly

app/controllers/projects/deployments_controller.rb

 class Projects::DeploymentsController < Projects::ApplicationController
+  before_action :authorize_read_environment!
   before_action :authorize_read_deployment!
 
   def index
-    serializer = DeploymentSerializer.new(user: @current_user, project: project)
-
     deployments = environment.deployments.reorder(created_at: :desc)
     deployments = deployments.where('created_at > ?', params[:after].to_time) if params[:after]&.to_time
-    deployments = deployments.map { |deployment| serializer.represent(deployment) }
 
-    render json: { deployments: deployments }
+    render json: { deployments: DeploymentSerializer.new(user: @current_user, project: project)
+                                  .represent(deployments) }
   end
 
   private