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| author | Xavier Noria <fxn@hashref.com> | 2009-03-13 09:29:37 +0100 |
|---|---|---|
| committer | Xavier Noria <fxn@hashref.com> | 2009-03-13 09:29:37 +0100 |
| commit | 60644467527bf2ffb45148b80f572a11a73f6e56 (patch) | |
| tree | d67208d5f9aa851a908d6c72a6c6eebcd28f2d87 | |
| parent | 8ac0e631046664b18349b3be32d8f7ba1ffdbdd7 (diff) | |
| download | rails-60644467527bf2ffb45148b80f572a11a73f6e56.tar.gz rails-60644467527bf2ffb45148b80f572a11a73f6e56.tar.bz2 rails-60644467527bf2ffb45148b80f572a11a73f6e56.zip | |
explains the order in which records are fetched by find_each
| -rw-r--r-- | railties/guides/source/active_record_querying.textile | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/railties/guides/source/active_record_querying.textile b/railties/guides/source/active_record_querying.textile index c902e457d4..f66947e47d 100644 --- a/railties/guides/source/active_record_querying.textile +++ b/railties/guides/source/active_record_querying.textile @@ -809,7 +809,7 @@ To be able to iterate over big sets of rows like that Active Record provides +fi Behind the scenes +find_each+ fetches rows in batches of 1000 and yields them one by one. The size of the underlying batches is configurable via the +:batch_size+ option. -The +:start+ option allows you to configure the first ID of the sequence if the lowest is not the one you need. This may be useful for example to be able to resume an interrupted batch process if it saves the last processed ID as a checkpoint. +Records are fetched in ascending order on the primary key, which must be an integer. The +:start+ option allows you to configure the first ID of the sequence if the lowest is not the one you need. This may be useful for example to be able to resume an interrupted batch process if it saves the last processed ID as a checkpoint. +find_each+ accepts the same options as +find+ except for +:order+ and +:limit+. Those two are needed internally and if the options argument include any of them an exception is raised. |