You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: migrations_controller.rb
    path of file: ./repos/test_track/app/controllers/api/v2
    
    the code of the file until where you have to start completion: class Api::V2
    
  def create
    app_migration = current_app.migrations.find_or_initialize_by(create_params)
    if app_migration.save
      head :no_content
    else
      render_errors app_migration
    end