Displaying queries using ajax in Rails

Can someone assist me in dealing with a particular issue? I am using ajax to refresh queries from the database dynamically each time there is a change in a search form.

The main objective is to load N number of records based on the parameters selected in the search form.

I currently have code that enables me to query the database and display the results on the webpage. The code is functioning properly, and for each record in the query result, it displays a "square".

This is the controller:

 def clientsjson

      @search  =  Client.search(params[:q])
      @clients = @search.result

      respond_to do |format|
        format.json { render :json => @clients }
      end
  end

Here is the JavaScript file:

$(document).ready(function() {
   $( ".searchupdate" ).change(function() {

    $.getJSON("/client/clientsjson?"+$('#client_search').serialize(), function (data) {

        var $ul = $('<div></div>');

         $ul.append(data.map(function(data) {
                // HTML structure for displaying data from the JSON response 

         }));

         $('#clientList1').html('');
         $('#clientList1').empty().append($ul);

    });

  });
});

This is the HTML part:

<div id="clientList1"></div>

Although the code works almost perfectly, I encounter two main issues:

  1. The 'client' model has multiple parent models such as country, city, languages, etc. The JSON query only provides IDs without names. How can I access the parent models to retrieve and print the names instead of the IDs?

  2. Similarly, how can I access child models like 'client.comments' when rendering them from JSON isn't possible? Is there a way to access associated child models for each record in the query?

Any suggestions on how to improve this process would be greatly appreciated. Thank you!

////Update

After calling localhost:3000/client/clientsjson.json?q=test in my browser, the output looks like this:

[{"comments":[]},{"comments":[]}, {"comments":[]}]

This is the Json Builder file:

json.array! @clients do |client|
  // Nested attributes to include in the JSON response

end

And here is the route defined in routes.rb to invoke the action:

get 'client/clientsjson' => "clients#clientsjson", :as => 'clientsjson', :format => :json

Answer №1

To enhance the structure of your JSON response, consider utilizing either jbuilder or RABL. These tools provide a straightforward way to include associated data in your JSON output.

In this scenario, you can create a view file at:

app/views/clients/clientjson.json.jbuilder

Your jbuilder template could resemble the following example:

json.array! @clients do |client|
  json.id client.id
  json.name client.name
  json.rate client.rate
  json.address client.address
  json.date client.date
  json.numbercomments client.numbercomments

  json.comments client.comments, :subject, :comment, :created_at

  json.country do
    json.name client.country.name
  end

  json.city do
    json.name client.city.name
  end

  json.language do
    json.name client.language.name
  end

end

You should also update your controller action as follows:

def clientsjson
  @search  =  Client.search(params[:q])
  @clients = @search.result

  respond_to do |format|
    format.json
  end
end

This adjustment will provide all the necessary JSON nodes with associated data.

Answer №2

Utilizing jbuilder or RABL for JSON generation is a great choice. It allows for customization in determining the data to retrieve, including nested arrays for related records.

In cases like this one, incorporating Backbone.JS and handlebars for javascript templating could be beneficial. This approach helps separate HTML from Javascript, simplifying future modifications to either aspect. While any JS templating system is better than none, my personal satisfaction lies with Backbone and Handlebars.

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