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module ActiveRelation
module Predicates
class Base
def ==(other)
self.class == other.class
end
end
class Binary < Base
attr_reader :attribute1, :attribute2
def initialize(attribute1, attribute2)
@attribute1, @attribute2 = attribute1, attribute2
end
def ==(other)
super and @attribute1 == other.attribute1 and @attribute2 == other.attribute2
end
def qualify
self.class.new(attribute1.qualify, attribute2.qualify)
end
def to_sql(options = {})
"#{attribute1.to_sql} #{predicate_sql} #{attribute2.to_sql}"
end
end
class Equality < Binary
def ==(other)
self.class == other.class and
((attribute1 == other.attribute1 and attribute2 == other.attribute2) or
(attribute1 == other.attribute2 and attribute2 == other.attribute1))
end
protected
def predicate_sql
'='
end
end
class GreaterThanOrEqualTo < Binary
protected
def predicate_sql
'>='
end
end
class GreaterThan < Binary
protected
def predicate_sql
'>'
end
end
class LessThanOrEqualTo < Binary
protected
def predicate_sql
'<='
end
end
class LessThan < Binary
protected
def predicate_sql
'<'
end
end
class Match < Base
attr_reader :attribute, :regexp
def initialize(attribute, regexp)
@attribute, @regexp = attribute, regexp
end
end
class RelationInclusion < Base
attr_reader :attribute, :relation
def initialize(attribute, relation)
@attribute, @relation = attribute, relation
end
def ==(other)
super and attribute == other.attribute and relation == other.relation
end
def to_sql(options = {})
"#{attribute.to_sql} IN (#{relation.to_sql})"
end
end
end
end
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