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Document unchangeable column types. #2788

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Nov 2, 2016
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Document unchangeable column types. #2788

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4 changes: 3 additions & 1 deletion migrations.md
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Expand Up @@ -283,7 +283,7 @@ Before modifying a column, be sure to add the `doctrine/dbal` dependency to your

#### Updating Column Attributes

The `change` method allows you to modify an existing column to a new type or modify the column's attributes. For example, you may wish to increase the size of a string column. To see the `change` method in action, let's increase the size of the `name` column from 25 to 50:
The `change` method allows you to modify some existing column types to a new type or modify the column's attributes. For example, you may wish to increase the size of a string column. To see the `change` method in action, let's increase the size of the `name` column from 25 to 50:

Schema::table('users', function ($table) {
$table->string('name', 50)->change();
Expand All @@ -294,6 +294,8 @@ We could also modify a column to be nullable:
Schema::table('users', function ($table) {
$table->string('name', 50)->nullable()->change();
});

> {note} These column types can _NOT_ be changed in this way: `char, double, enum, mediumInteger, timestamp, tinyInteger, ipAddress, json, jsonb, macAddress, mediumIncrements, morphs, nullableTimestamps, softDeletes, timeTz, timestampTz, timestamps, timestampsTz, unsignedMediumInteger, unsignedTinyInteger, uuid`.

> {note} Modifying any column in a table that also has a column of type `enum` is not currently supported.

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