active_attr by cgriego

Adds file validators to ActiveModel. Maintained by musaffa on GitHub, where it has earned 259 stars from the community.

Date and time validation plugin for ActiveModel and Rails. Supports multiple ORMs and allows custom date/time formats. Maintained by adzap on GitHub, where it has earned 1,620 stars from the community.

An ActiveModel extension that automatically strips all attributes of leading and trailing whitespace before validation. If the attribute is blank, it strips the value to nil. Maintained by rmm5t on GitHub, where it has earned 650 stars from the community.