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module ActiveRelation
class Predicate
def ==(other)
self.class == other.class
end
end
class Binary < Predicate
attr_reader :attribute, :operand
def initialize(attribute, operand)
@attribute, @operand = attribute, operand
end
def ==(other)
super and @attribute == other.attribute and @operand == other.operand
end
def bind(relation)
descend{ |x| x.bind(relation) }
end
def qualify
descend(&:qualify)
end
def to_sql(strategy = Sql::Predicate.new)
"#{attribute.to_sql(strategy)} #{predicate_sql} #{operand.to_sql(strategy)}"
end
def descend
self.class.new(yield(attribute), yield(operand))
end
end
class Equality < Binary
def ==(other)
self.class == other.class and
((attribute == other.attribute and operand == other.operand) or
(attribute == other.operand and operand == other.attribute))
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 < Binary
alias_method :regexp, :operand
def initialize(attribute, regexp)
@attribute, @regexp = attribute, regexp
end
end
class RelationInclusion < Binary
alias_method :relation, :operand
protected
def predicate_sql
'IN'
end
end
end
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