method

register_handler

v4.1.8 - Show latest stable - 0 notes - Class: ActiveRecord::PredicateBuilder

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What's this?

register_handler(klass, handler) public

Define how a class is converted to Arel nodes when passed to where. The handler can be any object that responds to call, and will be used for any value that +===+ the class given. For example:

MyCustomDateRange = Struct.new(:start, :end)
handler = proc do |column, range|
  Arel::Nodes::Between.new(column,
    Arel::Nodes::And.new([range.start, range.end])
  )
end
ActiveRecord::PredicateBuilder.register_handler(MyCustomDateRange, handler)

Show source

# File activerecord/lib/active_record/relation/predicate_builder.rb, line 104
    def self.register_handler(klass, handler)
      @handlers.unshift([klass, handler])
    end

register_handler

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