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Diffstat (limited to 'activemodel/lib/active_model/validations/uniqueness.rb')
| -rw-r--r-- | activemodel/lib/active_model/validations/uniqueness.rb | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/activemodel/lib/active_model/validations/uniqueness.rb b/activemodel/lib/active_model/validations/uniqueness.rb deleted file mode 100644 index 593d2cfd54..0000000000 --- a/activemodel/lib/active_model/validations/uniqueness.rb +++ /dev/null @@ -1,104 +0,0 @@ -module ActiveModel - module Validations - module ClassMethods - # Validates whether the value of the specified attributes are unique across the system. Useful for making sure that only one user - # can be named "davidhh". - # - # class Person < ActiveRecord::Base - # 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 - # attribute (that maps to a column). When the record is updated, the same check is made but disregarding the record itself. - # - # Because this check is performed outside the database there is still a chance that duplicate values - # will be inserted in two parallel transactions. To guarantee against this you should create a - # unique index on the field. See +add_index+ for more information. - # - # Configuration options: - # * <tt>:message</tt> - Specifies a custom error message (default is: "has already been taken") - # * <tt>:scope</tt> - One or more columns by which to limit the scope of the uniqueness constraint. - # * <tt>:case_sensitive</tt> - Looks for an exact match. Ignored by non-text columns (+true+ by default). - # * <tt>:allow_nil</tt> - If set to +true+, skips this validation if the attribute is +nil+ (default is: +false+) - # * <tt>:allow_blank</tt> - If set to +true+, skips this validation if the attribute is blank (default is: +false+) - # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should - # occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should - # not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). 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.extract_options!) - - validates_each(attr_names,configuration) do |record, attr_name, value| - # The check for an existing value should be run from a class that - # isn't abstract. This means working down from the current class - # (self), to the first non-abstract class. Since classes don't know - # their subclasses, we have to build the hierarchy between self and - # the record's class. - class_hierarchy = [record.class] - while class_hierarchy.first != self - class_hierarchy.insert(0, class_hierarchy.first.superclass) - end - - # Now we can work our way down the tree to the first non-abstract - # class (which has a database table to query from). - finder_class = class_hierarchy.detect { |klass| !klass.abstract_class? } - - if value.nil? || (configuration[:case_sensitive] || !finder_class.columns_hash[attr_name.to_s].text?) - condition_sql = "#{record.class.quoted_table_name}.#{attr_name} #{attribute_condition(value)}" - condition_params = [value] - else - # sqlite has case sensitive SELECT query, while MySQL/Postgresql don't. - # Hence, this is needed only for sqlite. - condition_sql = "LOWER(#{record.class.quoted_table_name}.#{attr_name}) #{attribute_condition(value)}" - condition_params = [value.downcase] - end - - if scope = configuration[:scope] - Array(scope).map do |scope_item| - scope_value = record.send(scope_item) - condition_sql << " AND #{record.class.quoted_table_name}.#{scope_item} #{attribute_condition(scope_value)}" - condition_params << scope_value - end - end - - unless record.new_record? - condition_sql << " AND #{record.class.quoted_table_name}.#{record.class.primary_key} <> ?" - condition_params << record.send(:id) - end - - results = finder_class.with_exclusive_scope do - connection.select_all( - construct_finder_sql( - :select => attr_name, - :from => finder_class.quoted_table_name, - :conditions => [condition_sql, *condition_params] - ) - ) - end - - unless results.length.zero? - found = true - - # As MySQL/Postgres don't have case sensitive SELECT queries, we try to find duplicate - # column in ruby when case sensitive option - if configuration[:case_sensitive] && finder_class.columns_hash[attr_name.to_s].text? - found = results.any? { |a| a[attr_name.to_s] == value } - end - - record.errors.add(attr_name, configuration[:message]) if found - end - end - end - end - end -end |