diff options
Diffstat (limited to 'railties')
| -rw-r--r-- | railties/guides/source/active_record_querying.textile | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/railties/guides/source/active_record_querying.textile b/railties/guides/source/active_record_querying.textile index 009d541106..484ba796bd 100644 --- a/railties/guides/source/active_record_querying.textile +++ b/railties/guides/source/active_record_querying.textile @@ -130,6 +130,40 @@ SELECT * FROM clients ORDER BY clients.id DESC LIMIT 1 <tt>Model.last</tt> returns +nil+ if no matching record is found. No exception will be raised. +h5. +first!+ + +<tt>Model.first!</tt> finds the first record matched by the supplied options. For example: + +<ruby> +client = Client.first! +=> #<Client id: 1, first_name: "Lifo"> +</ruby> + +SQL equivalent of the above is: + +<sql> +SELECT * FROM clients LIMIT 1 +</sql> + +<tt>Model.first!</tt> raises +RecordNotFound+ if no matching record is found. + +h5. +last!+ + +<tt>Model.last!</tt> finds the last record matched by the supplied options. For example: + +<ruby> +client = Client.last! +=> #<Client id: 221, first_name: "Russel"> +</ruby> + +SQL equivalent of the above is: + +<sql> +SELECT * FROM clients ORDER BY clients.id DESC LIMIT 1 +</sql> + +<tt>Model.last!</tt> raises +RecordNotFound+ if no matching record is found. + h4. Retrieving Multiple Objects h5. Using Multiple Primary Keys |