JBuilder中未定义的局部变量或方法`json'

When I try get all categories (index action) there is an error:

当我尝试获取所有类别（索引操作）时出现错误：

undefined local variable or method `json'

But in show action everything fine. All files has .jbuilder extension. Here is controller code:

但在展示行动一切都很好。所有文件都有.jbuilder扩展名。这是控制器代码：

def index
  @categories = Category.all
end

# GET /categories/1
# GET /categories/1.json
def show
  @category = Category.find(params[:id])
end

Stack trace:

堆栈跟踪：

app/views/categories/index.json.builder:1:in_app_views_categories_index_json_builder___502133872307116590_70140532925300' actionpack (3.2.11) lib/action_view/template.rb:145:inblock in render'
activesupport (3.2.11) lib/active_support/notifications.rb:125:in instrument' actionpack (3.2.11) lib/action_view/template.rb:143:inrender'

app / views / categories / index.json.builder：1：in_app_views_categories_index_json_builder ___ 502133872307116590_70140532925300'actionpack（3.2.11）lib / action_view / template.rb：145：inblock in render'activesupport（3.2.11）lib / active_support / notifications.rb: 125：在仪器'actionpack（3.2.11）lib / action_view / template.rb：143：inrender'

2 个解决方案

#1

Try to rename your file index.json.builder to index.json.jbuilder

尝试将文件index.json.builder重命名为index.json.jbuilder

#2

You could also rename it to index.json.jpbuilder and use this gem: https://github.com/bigjason/jpbuilder (if you want JSONP)

你也可以将它重命名为index.json.jpbuilder并使用这个gem：https：//github.com/bigjason/jpbuilder（如果你想要JSONP）

#1