Running `rails generate scaffold` on an existing model in Rails

If you have an existing model in your Rails application and want to generate a scaffold for it, you can use the rails generate scaffold command with the appropriate options.

├Źndice
  1. Step 1: Generate the Scaffold
  2. Step 2: Modify the Controller
  3. Step 3: Modify the Views
  4. Conclusion

Step 1: Generate the Scaffold

The first step is to run the command with the name of your existing model:

rails generate scaffold ModelName

Replace ModelName with the name of your existing model.

This will generate the necessary files for a scaffold, including a controller, views, and routes.

Step 2: Modify the Controller

Since you already have a model, you will need to modify the generated controller to use the existing model. Open the generated controller file, which will be located at app/controllers/model_names_controller.rb.

Replace ModelName with the name of your existing model in the following lines:

class ModelNamesController < ApplicationController
  before_action :set_model_name, only: [:show, :edit, :update, :destroy]

  # ...

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_model_name
      @model_name = ModelName.find(params[:id])
    end

    # ...

    # Only allow a list of trusted parameters through.
    def model_name_params
      params.require(:model_name).permit(:attribute1, :attribute2)
    end
end

Step 3: Modify the Views

You will also need to modify the generated views to use your existing model. Open the generated views, which will be located in the app/views/model_names directory.

Replace ModelName with the name of your existing model in the following files:

  • _form.html.erb
  • edit.html.erb
  • index.html.erb
  • new.html.erb
  • show.html.erb

In each of these files, replace model_name with the name of your existing model in the form fields and any other references to the model.

Conclusion

By following these steps, you can generate a scaffold for an existing model in your Rails application and modify the generated files to use your existing model. This can save you time and effort in setting up a new scaffold from scratch.

Click to rate this post!
[Total: 0 Average: 0]

Related posts

Leave a Reply

Your email address will not be published. Required fields are marked *

Go up

Below we inform you of the use we make of the data we collect while browsing our pages. You can change your preferences at any time by accessing the link to the Privacy Area that you will find at the bottom of our main page. More Information