undefined local variable or method `json' in JBuilder

Question

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

undefined local variable or method `json'

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

def index
  @categories = Category.all
end

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

Stack trace:

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'

Answer 1

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

Answer 2

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