forgeplus/app/controllers/api/pm/issue_links_controller.rb

class Api::Pm::IssueLinksController <  Api::Pm::BaseController
  before_action :load_project
  before_action :load_issue
  def index
    @links = @issue.pm_links.where(be_linkable_type: 'Issue')
  end

  def create
    params[:link_ids].map { |e| @issue.pm_links.find_or_create_by(be_linkable_type: 'Issue', be_linkable_id: e) }
    render_ok
  end

  def destroy
    @link = @issue.pm_links.find_by(be_linkable_type: 'Issue', be_linkable_id: params[:id])
    if @link.try(:destroy)
      render_ok
    else
      render_error('删除失败！')
    end
  end
end