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class Attribute
attr_reader :relation, :attribute_name, :aliaz
def initialize(relation, attribute_name, aliaz = nil)
@relation, @attribute_name, @aliaz = relation, attribute_name, aliaz
end
def aliazz(aliaz)
Attribute.new(relation, attribute_name, aliaz)
end
def eql?(other)
relation == other.relation and attribute_name == other.attribute_name
end
def ==(other)
EqualityPredicate.new(self, other)
end
def <(other)
LessThanPredicate.new(self, other)
end
def <=(other)
LessThanOrEqualToPredicate.new(self, other)
end
def >(other)
GreaterThanPredicate.new(self, other)
end
def >=(other)
GreaterThanOrEqualToPredicate.new(self, other)
end
def =~(regexp)
MatchPredicate.new(self, regexp)
end
def to_sql(builder = SelectsBuilder.new)
builder.call do
column relation.table, attribute_name, aliaz
end
end
end
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