working4.tar.gz

default

hello

crud migration

crud CR

crud app1

redd

testing

votable_fix

CRUD new1

In this course, you will learn the fundamentals of Ruby on Rails to build your own application.

You will start by learning how to create a new project, deploy to a Rails server, and the Rails design pattern. After that, you’ll learn how to perform CRUD operations, handle user authentication, and manage sessions.

Once you finish this course, you’ll have the foundations in place to build more complex applications to add to your portfolio.

Introduction to Ruby on Rails

## Writing your own migrations
The `generate` command only provides you with a template to work off of. It will create a single table with the specified attributes, and a migration will be generated for the command. To really make use of migrations, you need to be familiar with the various methods it contains.

> **Note:** A migration file is created when the command is run for the first time. Trying to use the `generate model` command with the same model name will give an error.  You will have to run migration commands to make changes to the model.

### Up and down methods
The `up` and `down` methods perform opposing functions. Whatever transformation is made by your `up` method should be exactly reverted when you run the `down` method. Essentially, running the `up` and `down` methods in succession should leave the database schema unchanged.

If your `up` method creates a table, your `down` method should drop it. It is recommended that the reversal of the transformations using the `down` method be done in reverse order.



# Writing your own migrations
The `generate` command only provides you with a template to work off of. It will create a single table with the specified attributes, and a migration will be generated for the command. To really make use of migrations, you need to be familiar with the various methods it contains.

> **Note:** A migration file is created when the command is run for the first time. Trying to use the `generate model` command with the same model name will give an error.  You will have to run migration commands to make changes to the model.

## Up and down methods
The `up` and `down` methods perform opposing functions. Whatever transformation is made by your `up` method should be exactly reverted when you run the `down` method. Essentially, running the `up` and `down` methods in succession should leave the database schema unchanged.

If your `up` method creates a table, your `down` method should drop it. It is recommended that the reversal of the transformations using the `down` method be done in reverse order.



Learn about the various methods in Rails migrations and how to use them.

Introduction to Ruby on Rails

CRUD on Rails

Your First Rails Application!

Comments

Testing

Conclusion

Migrations Methods

Writing your own migrations

Up and down methods