[Rails-core] delete_all with limit
Hi, I was wondering if there is a specific reason why delete_all does not accept limits? Ultimately, I want to achieve batched deletes in my application and something like delete_in_batches or even delete_allthat accepts limits would be useful. I can try adding this but wanted to get some feedback/suggestions first. -- You received this message because you are subscribed to the Google Groups Ruby on Rails: Core group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-core+unsubscr...@googlegroups.com. To post to this group, send email to rubyonrails-core@googlegroups.com. Visit this group at http://groups.google.com/group/rubyonrails-core. For more options, visit https://groups.google.com/d/optout.
Re: [Rails-core] delete_all with limit
On Apr 3, 2014, at 2:28 PM, Isha i...@jadedpixel.com wrote: Hi, I was wondering if there is a specific reason why delete_all does not accept limits? Ultimately, I want to achieve batched deletes in my application and something like delete_in_batches or even delete_allthat accepts limits would be useful. I can try adding this but wanted to get some feedback/suggestions first. FWIW, passing a LIMIT clause to a DELETE is included in the SQL92 standard, but actually-implemented support is spotty: * Postgres: not supported * Oracle: not supported (but maybe hackable with ROWNUM tricks) * SQLite3: supported if enabled at compile time * MySQL: supported * SQL Server: not supported (but maybe with a TOP subquery?) —Matt Jones signature.asc Description: Message signed with OpenPGP using GPGMail
Re: [Rails-core] delete_all with limit
In addition to Matt's suggestion, there is a usual workaround for this that's achieved by copying all ids in batches to a separate table then joining on it. I guess it's tricky to achieve with Rails given this table dependency. How would you solve it if it proves needed? On Thu, Apr 3, 2014 at 11:54 PM, Matt Jones al2o...@gmail.com wrote: On Apr 3, 2014, at 2:28 PM, Isha i...@jadedpixel.com wrote: Hi, I was wondering if there is a specific reason why delete_all does not accept limits? Ultimately, I want to achieve batched deletes in my application and something like delete_in_batches or even delete_allthat accepts limits would be useful. I can try adding this but wanted to get some feedback/suggestions first. FWIW, passing a LIMIT clause to a DELETE is included in the SQL92 standard, but actually-implemented support is spotty: * Postgres: not supported * Oracle: not supported (but maybe hackable with ROWNUM tricks) * SQLite3: supported if enabled at compile time * MySQL: supported * SQL Server: not supported (but maybe with a TOP subquery?) --Matt Jones -- Mohamed Wael Khobalatte -- You received this message because you are subscribed to the Google Groups Ruby on Rails: Core group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-core+unsubscr...@googlegroups.com. To post to this group, send email to rubyonrails-core@googlegroups.com. Visit this group at http://groups.google.com/group/rubyonrails-core. For more options, visit https://groups.google.com/d/optout.
