rails 4 template missing error in render in ajax - ruby-on-rails

Question

I have the following ajax function
$.ajax({
url: '/sub_categories/sub_cat',
data: 'sub_cat=45',
success: function() {
alert('success');
}
})
Here is my controller
require 'json'
class SubCategoriesController < ApplicationController
def show
end
def sub_cat
#sub_categories = SubCategory.where(category_id: params[:cat_id])
html = render_to_string 'sub_categories/sub_cat'
response_html true,html
end
end
My application controller
def response_html status,html
respond_to do |format|
format.json {render json: {
status: status,
html: html,
}
}
format.html
end
end
I have json file in sub_categories/sub_cat.json.erb
When I run getting error as
ActionView::MissingTemplate at /sub_categories/sub_cat.json
Missing template sub_categories/show, application/show with {:locale=>[:en], :formats=>[:json], :handlers=>[:erb, :builder, :raw, :ruby, :jbuilder, :coffee]}. Searched in:
* "/home/editmehere/Documents/site/name/app/views"
My route.rb has
resources :sub_categories do
get 'sub_cat', on: :collection
end
Why I am getting error like this and how can I solve it. Can anyone help me to solve it.

Answer 1

I'm guessing you're trying to keep your application dry, but why don't you just use this in your SubCategoriesController:
class SubCategoriesController < ApplicationController
def sub_cat
#sub_categories = SubCategory.where(category_id: params[:cat_id])
respond_to do |format|
format.json
format.html
end
end
end
This will allow you to call sub_cat.json.erb without having to pass the status var, or pre-render the HTML. This is just convention, so apologies if it's not what you need. I see a lot of people on here overcomplicate things, when simplicity would work much better
Ajax
Also, I believe you've got a problem with your ajax data var:
data: 'sub_cat=45',
should be
data: {sub_cat: "45"},