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module Arel
class Session
class << self
attr_accessor :instance
alias_method :manufacture, :new
def start
if defined?(@started) && @started
yield
else
begin
@started = true
@instance = manufacture
singleton_class.class_eval do
undef :new
alias_method :new, :instance
end
yield
ensure
singleton_class.class_eval do
undef :new
alias_method :new, :manufacture
end
@started = false
end
end
end
end
module CRUD
def create(insert)
insert.call
end
def read(select)
(@read ||= Hash.new do |hash, select|
hash[select] = select.call
end)[select]
end
def update(update)
update.call
end
def delete(delete)
delete.call
end
end
include CRUD
end
end
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