add update variant api.

app/controllers/api/v1/product_variants_controller.rb

@@ -0,0 +1,13 @@
+# encoding: utf-8
+module Api::V1
+  class ProductVariantsController < AppController
+    doorkeeper_for :update, scopes: [:write_products], unless: lambda { @api_client }
+
+    def update
+      @variant = shop.variants.find(params[:id])
+      @variant.update_attributes params[:variant].except(:id)
+      render :show
+    end
+
+  end
+end

app/views/api/v1/product_variants/show.rabl

@@ -0,0 +1,2 @@
+object @variant => :variant
+attributes :id, :product_id, :price, :compare_at_price, :weight, :sku, :position, :option1, :option2, :option3, :requires_shipping, :inventory_quantity, :inventory_management, :inventory_policy, :created_at, :updated_at

app/views/api/v1/products/index.rabl

@@ -1,2 +1,2 @@
 collection @products, root: :products, object_root: false
-attributes :id, :title, :body_html, :handle, :product_type, :vendor, :created_at, :updated_at
+extends "api/v1/products/show"

app/views/api/v1/products/show.rabl

@@ -0,0 +1,6 @@
+object @product
+attributes :id, :title, :body_html, :handle, :product_type, :vendor, :created_at, :updated_at
+
+child :variants => :variants do
+  extends "api/v1/product_variants/show"
+end

config/routes.rb

@@ -9,6 +9,7 @@
       get '/shop'           , to: "shops#show"
       post '/themes/install', to: 'themes#install'
       get '/products'       , to: "products#index"
+      put '/variants/:id'   , to: "product_variants#update"
       get '/orders'         , to: "orders#index"
       get '/orders/:id'     , to: "orders#show"
       post '/webhooks'      , to: "webhooks#create"

spec/controllers/api/v1/product_variants_controller_spec.rb

@@ -0,0 +1,70 @@
+#encoding: utf-8
+require 'spec_helper'
+
+describe Api::V1::ProductVariantsController do
+
+  let(:shop) { Factory(:user).shop }
+
+  let(:iphone4) { Factory :iphone4, shop: shop }
+
+  let(:variant) { iphone4.variants.first }
+
+  let(:body) { {id: variant.id, price: 45 }} # modify to
+
+  before :each do
+    request.host = "#{shop.primary_domain.host}"
+  end
+
+  context '#update' do
+
+    before { [iphone4] }
+
+    let(:application) { Factory :express_application } # OAuth application
+
+    context 'with scopes' do # 资源访问范围匹配
+
+      let(:token) { Factory :access_token, application: application, resource_owner_id: shop.id, scopes: "write_products" }
+
+      it 'should be success' do
+        put :update, id: variant.id, variant: body, format: :json, access_token: token.token
+        response.should be_success
+        json = JSON(response.body)['variant']
+        pattern = {
+          id: variant.id,
+          product_id: iphone4.id,
+          price: 45.0,
+          compare_at_price: 3500.0,
+          weight: 2.9,
+          sku: "APPLE1000",
+          position: 1,
+          option1: "默认标题",
+          option2: nil,
+          option3: nil,
+          requires_shipping: true,
+          inventory_quantity: nil,
+          inventory_management: nil,
+          inventory_policy: "deny",
+          created_at: WILDCARD_MATCHER,
+          updated_at: WILDCARD_MATCHER
+        }
+        json.should match_json_expression(pattern)
+      end
+
+    end
+
+    context 'without scopes' do # 资源访问范围不匹配
+
+      let(:token) { Factory :access_token, application: application, resource_owner_id: shop.id }
+
+      it 'should be fail' do # 认证失败
+        put :update, id: variant.id, variant: body, format: :json, access_token: token.token
+        response.should_not be_success
+        response.status.should eql 401
+      end
+
+    end
+
+
+  end
+
+end

spec/controllers/api/v1/products_controller_spec.rb

@@ -40,7 +40,25 @@
           product_type: "手机",
           vendor: "Apple",
           created_at: WILDCARD_MATCHER,
-          updated_at: WILDCARD_MATCHER
+          updated_at: WILDCARD_MATCHER,
+          variants: [{
+            id: 1,
+            product_id: 1,
+            price: 3000.0,
+            compare_at_price: 3500.0,
+            weight: 2.9,
+            sku: "APPLE1000",
+            position: 1,
+            option1: "默认标题",
+            option2: nil,
+            option3: nil,
+            requires_shipping: true,
+            inventory_quantity: nil,
+            inventory_management: nil,
+            inventory_policy: "deny",
+            created_at: WILDCARD_MATCHER,
+            updated_at: WILDCARD_MATCHER
+          }]
         }
         product_json.should match_json_expression(pattern)
       end