From and lock should be defined to be consistent with other ivars. Limit and offset are always defined, no need to test that.

[#4253 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

Signed-off-by: Nwycats <wycats@gmail.com>

Signed-off-by: Nwycats <wycats@gmail.com>

Signed-off-by: Nwycats <wycats@gmail.com>

Use quoted_table_name with arel.from() if no from values explicitly supplied. Arel seems to be spending a lot of time figuring out the FROM value otherwise.