issues_controller.rb

class Projects::IssuesController < Projects::ApplicationController
  before_filter :module_enabled
  before_filter :issue, only: [:edit, :update, :show]

  # Allow read any issue
  before_filter :authorize_read_issue!

  # Allow write(create) issue
  before_filter :authorize_write_issue!, only: [:new, :create]

  # Allow modify issue
  before_filter :authorize_modify_issue!, only: [:edit, :update]

  # Allow issues bulk update
  before_filter :authorize_admin_issues!, only: [:bulk_update]

  respond_to :html

  def index
    terms = params['issue_search']
    @issues = get_issues_collection
    @issues = @issues.full_search(terms) if terms.present?
    @issues = @issues.page(params[:page]).per(20)

    respond_to do |format|
      format.html
      format.atom { render layout: false }
      format.json do
        render json: {
          html: view_to_html_string("projects/issues/_issues")
        }
      end
    end
  end

  def new
    params[:issue] ||= ActionController::Parameters.new(
      assignee_id: ""
    )

    @issue = @project.issues.new(issue_params)
    respond_with(@issue)
  end

  def edit
    respond_with(@issue)
  end

  def show
    @note = @project.notes.new(noteable: @issue)
    @notes = @issue.notes.inc_author.fresh
    @noteable = @issue

    respond_with(@issue)
  end

  def create
    @issue = Issues::CreateService.new(project, current_user, issue_params).execute

    respond_to do |format|
      format.html do
        if @issue.valid?
          redirect_to namespace_project_issue_path(@project.namespace,
                                                   @project, @issue)
        else
          render :new
        end
      end
      format.js do |format|
        @link = @issue.attachment.url.to_js
      end
    end
  end

  def update
    @issue = Issues::UpdateService.new(project, current_user, issue_params).execute(issue)

    respond_to do |format|
      format.js
      format.html do
        if @issue.valid?
          redirect_to [@project.namespace.becomes(Namespace), @project, @issue]
        else
          render :edit
        end
      end
      format.json do
        render json: {
          saved: @issue.valid?,
          assignee_avatar_url: @issue.assignee.try(:avatar_url)
        }
      end
    end
  end

  def bulk_update
    result = Issues::BulkUpdateService.new(project, current_user, params).execute
    redirect_to :back, notice: "#{result[:count]} issues updated"
  end

  protected

  def issue
    @issue ||= begin
                 @project.issues.find_by!(iid: params[:id])
               rescue ActiveRecord::RecordNotFound
                 redirect_old
               end
  end

  def authorize_modify_issue!
    return render_404 unless can?(current_user, :modify_issue, @issue)
  end

  def authorize_admin_issues!
    return render_404 unless can?(current_user, :admin_issue, @project)
  end

  def module_enabled
    return render_404 unless @project.issues_enabled
  end

  # Since iids are implemented only in 6.1
  # user may navigate to issue page using old global ids.
  #
  # To prevent 404 errors we provide a redirect to correct iids until 7.0 release
  #
  def redirect_old
    issue = @project.issues.find_by(id: params[:id])

    if issue
      redirect_to namespace_project_issue_path(@project.namespace, @project,
                                               issue)
      return
    else
      raise ActiveRecord::RecordNotFound.new
    end
  end

  def issue_params
    params.require(:issue).permit(
      :title, :assignee_id, :position, :description,
      :milestone_id, :state_event, :task_num, label_ids: []
    )
  end
end