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module Arel
class Attribute
def column
original_relation.column_for(self)
end
def type_cast(value)
root.relation.format(self, value)
end
def format(object)
object.to_sql(Sql::Attribute.new(self))
end
def to_sql(formatter = Sql::WhereCondition.new(relation))
formatter.attribute self
end
end
class Value
delegate :inclusion_predicate_sql, :equality_predicate_sql, :to => :value
def to_sql(formatter = Sql::WhereCondition.new(relation))
formatter.value value
end
def format(object)
object.to_sql(Sql::Value.new(relation))
end
end
class Ordering
def to_sql(formatter = Sql::OrderClause.new(relation))
formatter.ordering self
end
end
class Ascending < Ordering
def direction_sql; 'ASC' end
end
class Descending < Ordering
def direction_sql; 'DESC' end
end
class Expression < Attribute
def to_sql(formatter = Sql::SelectClause.new(relation))
formatter.expression self
end
end
class Count < Expression
def function_sql; 'COUNT' end
end
class Distinct < Expression
def function_sql; 'DISTINCT' end
end
class Sum < Expression
def function_sql; 'SUM' end
end
class Maximum < Expression
def function_sql; 'MAX' end
end
class Minimum < Expression
def function_sql; 'MIN' end
end
class Average < Expression
def function_sql; 'AVG' end
end
end
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