记录下来lambda的用处

@required_attributes = [:member, :project,:membership_role, :membership_type]

@hash = @required_attributes.inject({}) { |memo, obj| memo[obj] = Factory(obj); memo }

hash.keys.each do |key|

? ? h_c = hash.clone

? ? h_c.delete(key)

? ? lambda{

? ? ? obj.create!(h_c)

? ? }.should raise_exception(

? ? ? ActiveRecord::RecordInvalid,

? ? ?"Validation failed: #{key.to_s.gsub(/_id/, '').capitalize.gsub(/_/, ' ')} can't be blank"

? ? )?

?end?