Building your own API with Rails/

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Update Products

Update Products

Learn how to add the standard HTTP method PUT for the Product model in the API.

We'll cover the following...

Hopefully, by now the logic to build the upcoming actions is clear. This lesson will focus on the update action for when we need to fetch the product from the database and update it.

Define update action

We will implement the update action on the users controller in app/controllers/api/v1/products_controller.rb. The code for the update function is below.

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class Api::V1::ProductsController < ApplicationController
  before_action :set_product, only: %i[show update]
  before_action :check_login, only: %i[create]
  before_action :check_owner, only: %i[update]
# ...
  
  def update
    if @product.update(product_params)
      render json: @product
    else
      render json: @product.errors, status: :unprocessable_entity
    end
  end
  private
  # ...
  def check_owner
    head :forbidden unless @product.user_id == current_user&.id
  end
  
  def set_product
    @product = Product.find(params[:id])
  end
end

The implementation is quite simple. We will retrieve the product from the ...