app/services/merge_requests/create_service.rb


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module MergeRequests
  class CreateService < MergeRequests::BaseService
    def execute
      # @project is used to determine whether the user can set the merge request's
      # assignee, milestone and labels. Whether they can depends on their
      # permissions on the target project.
      source_project = @project
      @project = Project.find(params[:target_project_id]) if params[:target_project_id]

      params[:target_project_id] ||= source_project.id

      merge_request = MergeRequest.new
      merge_request.source_project = source_project
      merge_request.merge_params['force_remove_source_branch'] = params.delete(:force_remove_source_branch)

      create(merge_request)
    end

    def after_create(issuable)
      event_service.open_mr(issuable, current_user)
      notification_service.new_merge_request(issuable, current_user)
      todo_service.new_merge_request(issuable, current_user)
    end
  end
end