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| author | Richard Schneeman <richard.schneeman+no-recruiters@gmail.com> | 2018-08-11 14:49:59 -0500 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2018-08-11 14:49:59 -0500 |
| commit | 141f50ef9ee6ce26820549e9f5b4629ddee182ce (patch) | |
| tree | 5a96ed0a7bea7697dba593537ef354019400af08 /guides | |
| parent | 317efa5c3593b70e9cc9a2fcb67488a302b71731 (diff) | |
| parent | 847e6915268e1ff1a1aeb5c48c7d9af01e2ff383 (diff) | |
| download | rails-141f50ef9ee6ce26820549e9f5b4629ddee182ce.tar.gz rails-141f50ef9ee6ce26820549e9f5b4629ddee182ce.tar.bz2 rails-141f50ef9ee6ce26820549e9f5b4629ddee182ce.zip | |
Merge pull request #33563 from lzap/foreign-key-note-doc
ActiveRecord Guide - sqlite3 foreign keys note
Diffstat (limited to 'guides')
| -rw-r--r-- | guides/source/active_record_migrations.md | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/guides/source/active_record_migrations.md b/guides/source/active_record_migrations.md index cfa444fda0..be5af133ff 100644 --- a/guides/source/active_record_migrations.md +++ b/guides/source/active_record_migrations.md @@ -491,6 +491,10 @@ 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. + Removing a foreign key is easy as well: ```ruby |