Ruby on Rails CRUD

Ruby on Rails is a web application framework written in the Ruby programming language. CRUD stands for Create, Read, Update, and Delete, which are the four basic functions of persistent storage.

Create

In Rails, creating a new record in the database is done using the create method. For example:

Post.create(title: 'My Title', content: 'Some content')

This creates a new post with the title "My Title" and content "Some content".

Read

To retrieve records from the database, Rails provides many query methods such as find, where, order, and more. Here's an example of retrieving all posts in descending order by created_at:

@posts = Post.order(created_at: :desc)

This retrieves all posts and assigns them to an instance variable @posts that can be used in a view template.

Update

To update an existing record, Rails provides the update method. For example, to update the content of a post with a certain id:

@post = Post.find(params[:id])
@post.update(content: 'New content')

This finds the post with the given id and updates its content.

Delete

To delete a record from the database, Rails provides the destroy method. For example, to delete a post with a certain id:

@post = Post.find(params[:id])
@post.destroy

This finds the post with the given id and deletes it from the database.

Conclusion

With Ruby on Rails, performing CRUD operations on a database is easy and intuitive. This is just a brief introduction to the topic, but there's much more to learn. By mastering Rails CRUD operations, you'll be able to build powerful web applications in no time.