Default conditions for Rails models
I have a model which has a field called deleted
, which is used to mark those deleted items.
So normally I would just want to query those having deleted = false
items, and in some special cases to list those deleted items for restoring.
Is it possible to do that? What I could 开发者_开发百科do now is just using a named scope having :conditions => {:deleted => false}
Is there a better way to do it so that When I do Item.other_named_scope
, I could find all those not-deleted items?
You can use default_scope for this.
class Post
default_scope :conditions => {:deleted => false}
end
Now all queries to the Post
model will be on ACTIVE
posts. When you want to override this behavior use with_exclusive_scope
:
Post.with_exclusive_scope{ find_all_by_deleted(true) } #returns deleted records
Reference:
Link 1
Caveat
The default_scope affects every finder call. It should be used with care and with full awareness of the unwanted side-effects.
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