The only case where we got a column that was not `nil`, but did not
respond to `cast_type` was when type casting the default value during
schema creation. We can look up the cast type, and add that object to
the column definition. Will allow us to consistently rely on the type
objects for type casting in all directions.
We're never going to be able to use the attribute object here, however,
so let's just accept the ugly demeter violation here for now.
Remove test cases which were either redundant with other tests in the
file, or were actually testing the type objects (which are tested
elsewhere)
The intention is to eventually remove `column` from the arguments list
both for `quote` and for `type_cast` entirely. This is the first step
to that end.
This patch fixes quoting for ActiveSupport::Duration instances:
# before
>> ActiveRecord::Base.connection.quote 30.minutes
=> "'--- 1800\n...\n'"
# after
>> ActiveRecord::Base.connection.quote 30.minutes
=> "1800"
Also, adds a test for type casting ActiveSupport::Duration instances.
Related to #1119.
