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💅 for migrations guide from #15457 [ci skip]

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Zachary Scott 2014-06-01 14:02:04 -07:00
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guides/source/migrations.md
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@ -417,25 +417,26 @@ column and adds an index on it. Finally it renames the `upccode` column.
### Changing Columns
Like the `remove_column` and `add_column` Rails provides the `change_column`.
Like the `remove_column` and `add_column` Rails provides the `change_column`
migration method.
```ruby
change_column :products, :part_number, :text
```
This changes the column part_number on products table to be a text.
This changes the column `part_number` on products table to be a `:text` field.
Besides the `change_column`, the `change_column_null` and
`change_column_default` are used specifically to change the null and default
values of a column.
Besides `change_column`, the `change_column_null` and `change_column_default`
methods are used specifically to change the null and default values of a
column.
```ruby
change_column_null :products, :name, false
change_column_default :products, :approved, false
```
This sets name on products to a NOT NULL column and the default value
of approved as false.
This sets `:name` field on products to a `NOT NULL` column and the default
value of the `:approved` field to false.
### When Helpers aren't Enough