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| author | Steve Klabnik <steve@steveklabnik.com> | 2013-08-12 06:57:36 -0700 |
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| committer | Steve Klabnik <steve@steveklabnik.com> | 2013-08-12 06:57:36 -0700 |
| commit | 4d1e5847cd2f8dfc566c12d3b9e5e7f811f53282 (patch) | |
| tree | 2de54215a4359b8a966450d6831b946ba0b01e79 /guides/source | |
| parent | bd14099e2ffbcbc33dfa36e274edca98a4921daa (diff) | |
| parent | ac02c190a50370500c72527e30a1da5e0d2da82c (diff) | |
| download | rails-4d1e5847cd2f8dfc566c12d3b9e5e7f811f53282.tar.gz rails-4d1e5847cd2f8dfc566c12d3b9e5e7f811f53282.tar.bz2 rails-4d1e5847cd2f8dfc566c12d3b9e5e7f811f53282.zip | |
Merge pull request #11852 from prijutme4ty/guide_addition
Added comment to a guide about necessity of `:dependent` option for asso... [ci skip]
Diffstat (limited to 'guides/source')
| -rw-r--r-- | guides/source/association_basics.md | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/guides/source/association_basics.md b/guides/source/association_basics.md index 9b80a65a44..e133e71d42 100644 --- a/guides/source/association_basics.md +++ b/guides/source/association_basics.md @@ -1137,6 +1137,12 @@ Controls what happens to the associated object when its owner is destroyed: * `:restrict_with_exception` causes an exception to be raised if there is an associated record * `:restrict_with_error` causes an error to be added to the owner if there is an associated object +It's necessary not to set or leave `:nullify` option for those associations +that have `NOT NULL` database constraints. If you don't set `dependent` to +destroy such associations you won't be able to change the associated object +because initial associated object foreign key will be set to unallowed `NULL` +value. + ##### `:foreign_key` By convention, Rails assumes that the column used to hold the foreign key on the other model is the name of this model with the suffix `_id` added. The `:foreign_key` option lets you set the name of the foreign key directly: |