module Ransack class Visitor def accept(object) visit(object) end def can_accept?(object) respond_to? DISPATCH[object.class] end def visit_Array(object) object.map { |o| accept(o) }.compact end def visit_Ransack_Nodes_Condition(object) object.arel_predicate if object.valid? end def visit_Ransack_Nodes_Grouping(object) object.combinator == 'or' ? visit_or(object) : visit_and(object) end def visit_and(object) nodes = object.values.map { |o| accept(o) }.compact return nil unless nodes.size > 0 if nodes.size > 1 Arel::Nodes::Grouping.new(Arel::Nodes::And.new(nodes)) else nodes.first end end def visit_or(object) nodes = object.values.map { |o| accept(o) }.compact return nil unless nodes.size > 0 if nodes.size > 1 nodes.inject(&:or) else nodes.first end end def visit_Ransack_Nodes_Sort(object) object.attr.send(object.dir) if object.valid? end def quoted?(object) case object when Arel::Nodes::SqlLiteral, Bignum, Fixnum false else true end end def visit(object) send(DISPATCH[object.class], object) end DISPATCH = Hash.new do |hash, klass| hash[klass] = "visit_#{klass.name.gsub('::', '_')}" end end end