Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
Commits on Jul 28, 2013
  1. @sgrif

    Add ability to specify how a class is converted to Arel predicate

    sgrif authored
    This adds the ability for rails apps or gems to have granular control
    over how a domain object is converted to sql. One simple use case would
    be to add support for Regexp. Another simple case would be something
    like the following:
    
        class DateRange < Struct.new(:start, :end)
          def include?(date)
            (start..end).cover?(date)
          end
        end
    
        class DateRangePredicate
          def call(attribute, range)
            attribute.in(range.start..range.end)
          end
        end
    
        ActiveRecord::PredicateBuilder.register_handler(DateRange,
          DateRangePredicate.new)
    
    More complex cases might include taking a currency object and converting
    it from EUR to USD before performing the query.
    
    By moving the existing handlers to this format, we were also able to
    nicely refactor a rather nasty method in PredicateBuilder.
Something went wrong with that request. Please try again.