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Clarify note that SQLite3 adapter doesn't support add_foreign_key [ci skip]

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Context https://github.com/rails/rails/pull/33563#discussion_r208891486.

Follow up #33563
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bogdanvlviv 2018-08-12 14:56:23 +03:00
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guides/source/active_record_migrations.md
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@ -491,9 +491,8 @@ NOTE: Active Record only supports single column foreign keys. `execute` and
`structure.sql` are required to use composite foreign keys. See
[Schema Dumping and You](#schema-dumping-and-you).
NOTE: At this time, only the mysql, mysql2 and postgresql adapters support
foreign keys. Implementation for sqlite3 is partial, keys are created for new
tables but not for existing tables via `ALTER TABLE` statement.
NOTE: The SQLite3 adapter doesn't support `add_foreign_key` since SQLite supports
only [a limited subset of ALTER TABLE](https://www.sqlite.org/lang_altertable.html).
Removing a foreign key is easy as well: