Invoke the controller function to retrieve information on the client side

I need to make a call to a server-side controller method that will return a string, eventually formatted as JSON. Once I receive this data on the client side, I want to use it to update a specific part of the user interface.

Here is my current setup:

Controller:

class HomeController < ApplicationController

  def index
  end

  def show
  end

  def name
    name = "Sean"
    respond_to do |format|
      format.html
      format.json {render json: name }
    end
  end
end

Routes:

  resources :home do 
    collection do
      get 'name'
    end
  end

AJAX Call:

window.callAPI = () ->
  $.ajax
    type: "GET"
    url: "/home/name"
    success: (data) ->
      console.log data
    error: (error) ->
      console.log error

However, I am encountering the following error:

Started GET "/home/name" for 127.0.0.1 at 2015-01-22 13:28:59 -0700
Processing by HomeController#name as */*
Completed 500 Internal Server Error in 9ms

ActionView::MissingTemplate (Missing template home/name, application/name with {:locale=>[:en], :formats=>[:html], :variants=>[], :handlers=>[:erb, :builder, :raw, :ruby, :slim, :coffee, :jbuilder]}. Searched in:
  * "/home/sylanz/Documents/NimbusCC/app/views"
):
  app/controllers/home_controller.rb:10:in `name'

Answer №1

Make sure to request the JSON format by calling /home/name.json as indicated in the error message. Otherwise, Rails will assume you want an HTML response since there is no HTML template available.

If this action is solely for an API endpoint, consider removing the format.html statement entirely.

Answer №2

Make sure to include the dataType option in your Ajax call:

$.ajax
  type: "GET"
  url: "/page/details"
  dataType: "json" #Don't forget this
  success: (response) ->
    console.log(response)

Answer №3

In jQuery, there exists a convenient shortcut called getJSON which can be used as a replacement for ajax when you need to specify the dataType: "json" as part of your request.

If you were wondering how to discover this, simply take a look at your logs:

:formats=>[:html]

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