diff options
Diffstat (limited to 'activerecord/lib/active_record/validations.rb')
| -rwxr-xr-x | activerecord/lib/active_record/validations.rb | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/activerecord/lib/active_record/validations.rb b/activerecord/lib/active_record/validations.rb index b6c9647b78..a7e7bd1f26 100755 --- a/activerecord/lib/active_record/validations.rb +++ b/activerecord/lib/active_record/validations.rb @@ -471,7 +471,14 @@ module ActiveRecord # can be named "davidhh". # # class Person < ActiveRecord::Base - # validates_uniqueness_of :user_name, :scope => "account_id" + # validates_uniqueness_of :user_name, :scope => :account_id + # end + # + # It can also validate whether the value of the specified attributes are unique based on multiple scope parameters. For example, + # making sure that a teacher can only be on the schedule once per semester for a particular class. + # + # class TeacherSchedule < ActiveRecord::Base + # validates_uniqueness_of :teacher_id, :scope => [:semester_id, :class_id] # end # # When the record is created, a check is performed to make sure that no record exists in the database with the given value for the specified @@ -479,10 +486,11 @@ module ActiveRecord # # Configuration options: # * <tt>message</tt> - Specifies a custom error message (default is: "has already been taken") - # * <tt>scope</tt> - Ensures that the uniqueness is restricted to a condition of "scope = record.scope" + # * <tt>scope</tt> - One or more columns by which to limit the scope of the uniquness constraint. # * <tt>if</tt> - Specifies a method, proc or string to call to determine if the validation should # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The # method, proc or string should return or evaluate to a true or false value. + def validates_uniqueness_of(*attr_names) configuration = { :message => ActiveRecord::Errors.default_error_messages[:taken] } configuration.update(attr_names.pop) if attr_names.last.is_a?(Hash) @@ -491,9 +499,11 @@ module ActiveRecord condition_sql = "#{attr_name} #{attribute_condition(value)}" condition_params = [value] if scope = configuration[:scope] - scope_value = record.send(scope) - condition_sql << " AND #{scope} #{attribute_condition(scope_value)}" - condition_params << scope_value + Array(scope).map do |scope_item| + scope_value = record.send(scope_item) + condition_sql << " AND #{scope_item} #{attribute_condition(scope_value)}" + condition_params << scope_value + end end unless record.new_record? condition_sql << " AND #{record.class.primary_key} <> ?" |