how to display the has_many in the api serializer rails

To display the has_many association in the API serializer in Rails, you can follow these steps:

Step 1: Define the association in your model In your model, use the has_many method to define the association. For example, if you have a User model that has many Posts, you would define it like this:

class User < ApplicationRecord
  has_many :posts
end

Step 2: Configure the serializer Create a serializer for the parent model (in this case, the User model) if you haven't already. You can use a gem like active_model_serializers to generate the serializer automatically. Once you have the serializer, configure it to include the has_many association.

class UserSerializer < ActiveModel::Serializer
  has_many :posts
end

Step 3: Customize the serialization If you want to include additional attributes or customize the serialization of the associated records, you can define a separate serializer for the associated model (in this case, the Post model). For example:

class PostSerializer < ActiveModel::Serializer
  attributes :id, :title, :body
end

Step 4: Render the serialized data in the API response In your controller, when rendering the JSON response, include the associated records by calling the association method on the parent object. For example:

class UsersController < ApplicationController
  def show
    user = User.find(params[:id])
    render json: user, include: :posts
  end
end

This will include the serialized posts data in the JSON response for the User record.

That's it! By following these steps, you can display the has_many association in the API serializer in Rails.