Calling Rails controller data through JS AJAX call

Question

I'm making a rails app using this code in the controller to call an API- I initially call the

inventories endpoint

, then make separate calls to two other id endpoints

store_id, product_id

to grabs specifics pieces of data linked to the inventories. This data gets passed into a hash that becomes '@inventories / transformed results':

class InventoriesController < ApplicationController

 def index

 response = Typhoeus.get("http://lcboapi.com/inventories")

 parsed_json = JSON.parse(response.body)



transformed_results = []



parsed_json["result"].each do |inventory|

  transformed_results.push(

    {

      product_name: product_lookup(inventory["product_id"]),

      store_name: store_lookup(inventory["store_id"]),

      quantity: inventory["quantity"],

    }

  )

end



@inventories = transformed_results

end

  private



  def store_lookup(store_id)

  response = Typhoeus.get("http://lcboapi.com/stores/#{store_id}")

    parsed_json = JSON.parse(response.body)

  return parsed_json["result"]["name"]

end



 def product_lookup(product_id)

 response = Typhoeus.get("http://lcboapi.com/products/#{product_id}")

     parsed_json = JSON.parse(response.body)

 return parsed_json["result"]["name"]

 end

end

My question is how best to get my json hash through AJAX into a form I can pass through and iterate in assets/javascript.

I am aware I can build it into the view (html.erb) and have done so, but I want to make my data interact with DOM elements.

Note: I've tried doing a simple console log to show the json data in the console as a test, with no response. I'm okay with using jQuery until I get comfortable with React, but I'm not sure how to grab my @inventories data from assets/javascript/inventories.js

document.addEventListener('DOMContentLoaded', function () {

  console.log("ready!");

  $.ajax({

    url: "/inventories",

    method: "GET",

    dataType: "json"

  }).done(function(data){

    console.log(data);

  });



})

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Answer 1

In one of your js files (in assets/javascript), you'll need to do something like:

storeLookupResults = $.ajax({
  url: "/inventories.js",
  type: 'GET'
})
storeLookupResults.success (data) =>
  # do stuff with your results
  # 'data' will contain your json

NOTE: I made up the route, so you'll need to make sure you use a real route

Then, in your InventoriesController, modify index to something like:

def index
  response = Typhoeus.get("http://lcboapi.com/inventories")
  parsed_json = JSON.parse(response.body).with_indifferent_access

  @inventories = parsed_json[:result].map do |inventory|
    {
      product_name: product_lookup(inventory[:product_id]),
      store_name: store_lookup(inventory[:store_id]),
      quantity: inventory[:quantity],
    }
  end

  respond_to do |format|
    format.html
    format.json {render json: @inventories, status: :ok}
  end  

end

Note that .map returns an array. So, you don't have to do:

transformed_results = []

parsed_json["result"].each do |inventory|
  transformed_results.push(
    {
      product_name: product_lookup(inventory["product_id"]),
      store_name: store_lookup(inventory["store_id"]),
      quantity: inventory["quantity"],
    }
  )
end    

@inventories = transformed_results

Also note that I did:

parsed_json = JSON.parse(response.body).with_indifferent_access

It's a purely stylistic preference. I like using symbols instead of strings.

Calling Rails controller data through JS AJAX call

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