新增：里程碑相关数量返回

app/controllers/api/v1/issues/milestones_controller.rb

@@ -5,14 +5,16 @@ class Api::V1::Issues::MilestonesController < Api::V1::BaseController
 
   # 里程碑列表
   def index 
+    @milestones = @project.versions
+    @milestones = @milestones.ransack(name_or_description_cont: params[:keyword]).result if params[:keyword].present?
+    @closed_milestone_count = @milestones.closed.size 
+    @opening_milestone_count = @milestones.opening.size
+    @milestones = params[:category] == "closed" ? @milestones.closed : @milestones.opening
     if params[:only_name]
-      @milestones = @project.versions.select(:id, :name)
-      @milestones = @milestones.ransack(name_or_description_cont: params[:keyword]).result if params[:keyword].present?
+      @milestones = @milestones.select(:id, :name)
       @milestones = kaminary_select_paginate(@milestones)
     else 
-      @milestones = @project.versions.includes(:issues, :closed_issues, :opened_issues)
-      @milestones = params[:category] == "closed" ? @milestones.closed : @milestones.opening
-      @milestones = @milestones.ransack(name_or_description_cont: params[:keyword]).result if params[:keyword].present?
+      @milestones = @milestones.includes(:issues, :closed_issues, :opened_issues)
       @milestones = kaminari_paginate(@milestones)
     end
   end 
@@ -65,4 +67,12 @@ class Api::V1::Issues::MilestonesController < Api::V1::BaseController
     return render_not_found('里程碑不存在！') unless @milestone.present?
   end
 
+  def sort_by 
+    Version.columns.include?(params.fetch(:sort_by, "created_on")) ? params.fetch(:sort_by, "created_on") : "created_on"
+  end
+
+  def sort_direction 
+    %w(desc asc).include?(params.fetch(:sort_direction, "updated_on")) ? params.fetch(:sort_direction, "updated_on") : "updated_on"
+  end
+
 end

app/views/api/v1/issues/milestones/_detail.json.jbuilder

@@ -1,5 +1,6 @@
 json.(milestone, :id, :name, :description, :effective_date, :status)
 json.issues_count milestone.opened_issues.size + milestone.closed_issues.size 
+json.opened_issues_count milestone.opened_issues.size
 json.close_issues_count milestone.closed_issues.size
 json.percent milestone.issue_percent
 json.created_at milestone.created_on.strftime("%Y-%m-%d %H:%M")

app/views/api/v1/issues/milestones/index.json.jbuilder

@@ -1,3 +1,5 @@
+json.closed_milestone_count @closed_milestone_count 
+json.opening_milestone_count @opening_milestone_count
 json.total_count @milestones.total_count
 json.milestones @milestones.each do |milestone| 
   if params[:only_name]