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This predicate was only to figure out if it's safe to do case
insensitive comparison, which is only a problem on PG. Turns out, PG can
just tell us whether we are able to do it or not. If the query turns out
to be a problem, let's just replace that method with checking the SQL
type for `text` or `character`. I'd rather not burden the type objects
with adapter specific knowledge.
The *real* solution, is to deprecate this behavior entirely. The only
reason we need it is because the `:case_sensitive` option for
`validates_uniqueness_of` is documented as "this option is ignored for
non-strings". It makes no sense for us to do that. If the type can't be
compared in a case insensitive way, the user shouldn't tell us to do
case insensitive comparison.
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I think we should deprecate this behavior and just error if you tell us
to do a case insensitive comparison for types which are not case
sensitive. Partially reverts 35592307
Fixes #18195
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Why are people assigning booleans to string columns? >_>
We unintentionally changed the behavior on Sqlite3 and PostgreSQL.
Boolean values should cast to the database's representation of true and
false. This is 't' and 'f' by default, and "1" and "0" on Mysql. The
implementation to make the connection adapter specific behavior is hacky
at best, and should be re-visted once we decide how we actually want to
separate the concerns related to things that should change based on the
database adapter.
That said, this isn't something I'd expect to change based on my
database adapter. We're storing a string, so the way the database
represents a boolean should be irrelevant. It also seems strange for us
to give booleans special behavior at all in string columns. Why is
`to_s` not sufficient? It's inconsistent and confusing. Perhaps we
should consider deprecating in the future.
Fixes #17571
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This was only used for uniqueness validations. The first usage was in
conjunction with `limit`. Types which cast to string, but are not
considered text cannot have a limit. The second case was only with an
explicit `:case_sensitive => true` option given by the user.
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Only `Date` and `Time` are handled.
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`ActiveRecord::ConnectionAdapters::Type::Value` =>
`ActiveRecord::Type::Value`
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