新增：项目标记接口

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

@@ -0,0 +1,27 @@
+class Api::V1::Issues::IssueTagsController < Api::V1::BaseController 
+
+  before_action :require_public_and_member_above, only: [:index] 
+
+  def index 
+    @issue_tags = @project.issue_tags.order("#{order_by} #{order_direction}")
+    if params[:only_name]
+      @issue_tags = kaminary_select_paginate(@issue_tags.select(:id, :name))
+    else 
+      @issue_tags = kaminari_paginate(@issue_tags)
+    end
+  end
+
+
+  private 
+  def order_by
+    order_by = params.fetch(:order_by, "created_at")
+    order_by = IssueTag.column_names.include?(order_by) ? order_by : "created_at"
+    order_by
+  end
+
+  def order_direction 
+    order_direction = params.fetch(:order_direction, "desc").downcase
+    order_direction = %w(desc asc).include?(order_direction) ? order_direction : "desc"
+    order_direction
+  end
+end

app/views/api/v1/issues/issue_tags/_simple_detail.json.jbuilder

@@ -0,0 +1 @@
+json.(tag, :id, :name)

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

@@ -0,0 +1,6 @@
+json.total_count @issue_tags.total_count
+json.issue_tags @issue_tags.each do |tag| 
+  if params[:only_name]
+    json.partial! "simple_detail", locals: {tag: tag}
+  end
+end

config/routes/api.rb

@@ -29,6 +29,7 @@ defaults format: :json do
           scope module: :projects do 
             resources :issues
             scope module: :issues do 
+              resources :issue_tags, only: [:index]
               resources :milestones, except: [:new, :edit]
               resources :issue_statues, only: [:index], controller: '/api/v1/issues/statues'
               resources :issue_authors, only: [:index], controller: '/api/v1/issues/authors'