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Add guides for required model generator option.

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Related to this PR #16062

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Carlos Souza 2014-12-09 15:29:28 -05:00
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guides/source/active_record_migrations.md
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@ -452,6 +452,8 @@ number of digits after the decimal point.
are using a dynamic value (such as a date), the default will only be calculated
the first time (i.e. on the date the migration is applied).
* `index` Adds an index for the column.
* `required` Adds `required: true` for `belongs_to` associations and
`null: false` to the column in the migration.
Some adapters may support additional options; see the adapter specific API docs
for further information.