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Of course, calculating timestamps is no fun, so Active Record provides a generator to handle making it for you:

This will create an empty but appropriately named migration:

If the migration name is of the form "AddXXXToYYY" or "RemoveXXXFromYYY" and is followed by a list of column names and types then a migration containing the appropriate add_column and remove_column statements will be created.

will generate

If you'd like to add an index on the new column, you can do that as well:

Similarly, you can generate a migration to remove a column from the command line:

generates

You are not limited to one magically generated column. For example:

If the migration name is of the form "CreateXXX" and is followed by a list of column names and types then a migration creating the table XXX with the columns listed will be generated. For example:

As always, what has been generated for you is just a starting point. You can add or remove from it as you see fit by editing the db/migrate/YYYYMMDDHHMMSS_add_details_to_products.rb file.

Also, the generator accepts column type as references (also available as belongs_to ). For instance:

This migration will create a user_id column and appropriate index. For more add_reference options, visit the Patricia Green Newbury 3ZFrV4
.

There is also a generator which will produce join tables if JoinTable is part of the name:

will produce the following migration:

The model and scaffold generators will create migrations appropriate for adding a new model. This migration will already contain instructions for creating the relevant table. If you tell Rails what columns you want, then statements for adding these columns will also be created. For example, running:

will create a migration that looks like this

You can append as many column name/type pairs as you want.

Some commonly used Easy Spirit Travel Time Shoe CvzJUX9Df7
can be passed directly on the command line. They are enclosed by curly braces and follow the field type:

For instance, running:

will produce a migration that looks like this

Have a look at the generators help output for further details.

Once you have created your migration using one of the generators it's time to get to work!

The create_table method is one of the most fundamental, but most of the time, will be generated for you from using a model or scaffold generator. A typical use would be

which creates a products table with a column called name (and as discussed below, an implicit id column).

By default, create_table will create a primary key called id . You can change the name of the primary key with the :primary_key option (don't forget to update the corresponding model) or, if you don't want a primary key at all, you can pass the option id: false . If you need to pass database specific options you can place an SQL fragment in the :options option. For example:

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