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validate_uniqueness_of and case insensitive columns ...
#1759
As far as I've seen, the case_sensitive_equality_operator is in
rails 2.2 bound to the connection adapter. But why is the more
expensive case insensitve case not handled in a connection adapter
bound way? On mysql an complete table-scan will run if someone
compares by using lower() = . The result would be the same, if not
using lower... in my freezed checkout of rails 1.x there was a
comment, that this is anyway only needed by sqlite.. so why don't
write a adapter specific method here as well? I had a lot of
trouble on my project, searching for the bottleneck, until I found
this out...
