新增：关键词搜索以及排序

app/controllers/api/pm/issues_controller.rb

@@ -45,6 +45,8 @@ class Api::Pm::IssuesController < Api::Pm::BaseController
                    .where.not(id: @issue.id)
                    .where.not(id: Issue.full_children_issues(@issue).map{|i|i.id}) 
     @issues = @issues.where(pm_issue_type: params[:pm_issue_type]) if params[:pm_issue_type].present?
+    @issues = @issues.ransack(id_or_project_issues_index_eq: params[:keyword]).result.or(@issues.ransack(subject_or_description_cont: params[:keyword]).result) if params[:keyword].present?
+    @issues = @issues.reorder("#{issue_sort_by} #{issue_sort_direction}")
     if params[:only_name].present?
       @issues = kaminary_select_paginate(
         @issues.select(:id, :subject, :project_issues_index, :updated_on, :created_on))
@@ -185,6 +187,18 @@ class Api::Pm::IssuesController < Api::Pm::BaseController
       :assigner_ids => [] )
   end
 
+  def issue_sort_by 
+    sort_by = params.fetch(:sort_by, "updated_on")
+    sort_by = Issue.column_names.include?(sort_by) ? sort_by : "updated_on"
+    sort_by
+  end
+
+  def issue_sort_direction 
+    sort_direction = params.fetch(:sort_direction, "desc").downcase
+    sort_direction = %w(desc asc).include?(sort_direction) ? sort_direction : "desc"
+    sort_direction
+  end
+
   def tag_sort_by
     sort_by = params.fetch(:sort_by, "created_at")
     sort_by = IssueTag.column_names.include?(sort_by) ? sort_by : "created_at"