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module ActiveRelation
class Aggregation
include Sql::Quoting
attr_reader :attribute, :function_sql, :alias
delegate :relation, :to => :attribute
def initialize(attribute, function_sql, aliaz = nil)
@attribute, @function_sql, @alias = attribute, function_sql, aliaz
end
module Transformations
def substitute(new_relation)
Aggregation.new(attribute.substitute(new_relation), function_sql, @alias)
end
def as(aliaz)
Aggregation.new(attribute, function_sql, aliaz)
end
def to_attribute
Attribute.new(relation, @alias)
end
end
include Transformations
def to_sql(strategy = nil)
"#{function_sql}(#{attribute.to_sql})" + (@alias ? " AS #{quote_column_name(@alias)}" : '')
end
def ==(other)
self.class == other.class and attribute == other.attribute and function_sql == other.function_sql
end
end
end
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