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module ActiveRecord
class Relation
delegate :to_sql, :to => :relation
attr_reader :relation, :klass
def initialize(klass, relation)
@klass, @relation = klass, relation
end
def to_a
@klass.find_by_sql(@relation.to_sql)
end
def each(&block)
to_a.each(&block)
end
def first
@relation = @relation.take(1)
to_a.first
end
def select(selects)
Relation.new(@klass, @relation.project(selects))
end
def group(groups)
Relation.new(@klass, @relation.group(groups))
end
def order(orders)
Relation.new(@klass, @relation.order(orders))
end
def limit(limits)
Relation.new(@klass, @relation.take(limits))
end
def offset(offsets)
Relation.new(@klass, @relation.skip(offsets))
end
def on(join)
Relation.new(@klass, @relation.on(join))
end
def joins(join, join_type = nil)
if join.blank?
self
else
join = case join
when String
@relation.join(join)
when Hash, Array, Symbol
if @klass.send(:array_of_strings?, join)
@relation.join(join.join(' '))
else
@relation.join(@klass.send(:build_association_joins, join))
end
else
@relation.join(join, join_type)
end
Relation.new(@klass, join)
end
end
def conditions(conditions)
if conditions.blank?
self
else
conditions = @klass.send(:merge_conditions, conditions) if [String, Hash, Array].include?(conditions.class)
Relation.new(@klass, @relation.where(conditions))
end
end
def respond_to?(method)
if @relation.respond_to?(method) || Array.instance_methods.include?(method.to_s)
true
else
super
end
end
private
def method_missing(method, *args, &block)
if @relation.respond_to?(method)
@relation.send(method, *args, &block)
elsif Array.instance_methods.include?(method.to_s)
to_a.send(method, *args, &block)
end
end
end
end
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