Module | Sequel::Plugins::ValidationClassMethods::ClassMethods
In: | lib/sequel/plugins/validation_class_methods.rb

### Methods

has_validations? inherited skip_superclass_validations skip_superclass_validations? validate validates validates_acceptance_of validates_confirmation_of validates_each validates_format_of validates_inclusion_of validates_length_of validates_not_string validates_numericality_of validates_presence_of validates_uniqueness_of

### Classes and Modules

Class Sequel::Plugins::ValidationClassMethods::ClassMethods::Generator

### Attributes

validations | [R] | A hash of associations for this model class. Keys are column symbols, values are arrays of validation procs.

### Public Instance methods

has_validations?()

Returns true if validations are defined.

[Source]

        # File lib/sequel/plugins/validation_class_methods.rb, line 40
    40:         def has_validations?
    41:           !validations.empty?
    42:         end

inherited(subclass)

Setup the validations hash in the subclass

[Source]

        # File lib/sequel/plugins/validation_class_methods.rb, line 45
    45:         def inherited(subclass)
    46:           super
    47:           subclass.class_eval do
    48:             @validation_mutex = Mutex.new
    49:             @validations = {}
    50:           end
    51:         end

skip_superclass_validations()

Instructs the model to skip validations defined in superclasses

[Source]

        # File lib/sequel/plugins/validation_class_methods.rb, line 54
    54:         def skip_superclass_validations
    55:           @skip_superclass_validations = true
    56:         end

skip_superclass_validations?()

Instructs the model to skip validations defined in superclasses

[Source]

        # File lib/sequel/plugins/validation_class_methods.rb, line 59
    59:         def skip_superclass_validations?
    60:           defined?(@skip_superclass_validations) && @skip_superclass_validations
    61:         end

validate(o)

Validates the given instance.

[Source]

        # File lib/sequel/plugins/validation_class_methods.rb, line 83
    83:         def validate(o)
    84:           superclass.validate(o) if superclass.respond_to?(:validate) && !skip_superclass_validations?
    85:           validations.each do |att, procs|
    86:             v = case att
    87:             when Array
    88:               att.collect{|a| o.send(a)}
    89:             else
    90:               o.send(att)
    91:             end
    92:             procs.each {|tag, p| p.call(o, att, v)}
    93:           end
    94:         end

validates(&block)

Defines validations by converting a longhand block into a series of shorthand definitions. For example:

      class MyClass < Sequel::Model
        validates do
          length_of :name, :minimum => 6
          length_of :password, :minimum => 8
        end
      end

is equivalent to:

      class MyClass < Sequel::Model
        validates_length_of :name, :minimum => 6
        validates_length_of :password, :minimum => 8
      end

[Source]

        # File lib/sequel/plugins/validation_class_methods.rb, line 78
    78:         def validates(&block)
    79:           Generator.new(self, &block)
    80:         end

validates_acceptance_of(*atts)

Validates acceptance of an attribute. Just checks that the value is equal to the :accept option. This method is unique in that :allow_nil is assumed to be true instead of false.

Possible Options:

- :accept - The value required for the object to be valid (default: ‘1’)
- :message - The message to use (default: ‘is not accepted’)

[Source]

         # File lib/sequel/plugins/validation_class_methods.rb, line 103
    103:         def validates_acceptance_of(*atts)
    104:           opts = {
    105:             :message => 'is not accepted',
    106:             :allow_nil => true,
    107:             :accept => '1',
    108:             :tag => :acceptance,
    109:           }.merge!(extract_options!(atts))
    110:           atts << opts
    111:           validates_each(*atts) do |o, a, v|
    112:             o.errors.add(a, opts[:message]) unless v == opts[:accept]
    113:           end
    114:         end

validates_confirmation_of(*atts)

Validates confirmation of an attribute. Checks that the object has a _confirmation value matching the current value. For example:

      validates_confirmation_of :blah

Just makes sure that object.blah = object.blah_confirmation. Often used for passwords or email addresses on web forms.

Possible Options:

- :message - The message to use (default: ‘is not confirmed’)

[Source]

         # File lib/sequel/plugins/validation_class_methods.rb, line 126
    126:         def validates_confirmation_of(*atts)
    127:           opts = {
    128:             :message => 'is not confirmed',
    129:             :tag => :confirmation,
    130:           }.merge!(extract_options!(atts))
    131:           atts << opts
    132:           validates_each(*atts) do |o, a, v|
    133:             o.errors.add(a, opts[:message]) unless v == o.send("#{a}_confirmation""#{a}_confirmation")
    134:           end
    135:         end

validates_each(*atts, &block)

Adds a validation for each of the given attributes using the supplied block. The block must accept three arguments: instance, attribute and value, e.g.:

      validates_each :name, :password do |object, attribute, value|
        object.errors.add(attribute, 'is not nice') unless value.nice?
      end

Possible Options:

- :allow_blank - Whether to skip the validation if the value is blank.
- :allow_missing - Whether to skip the validation if the attribute isn‘t a key in the values hash. This is different from allow_nil, because Sequel only sends the attributes in the values when doing an insert or update. If the attribute is not present, Sequel doesn‘t specify it, so the database will use the table‘s default value. This is different from having an attribute in values with a value of nil, which Sequel will send as NULL. If your database table has a non NULL default, this may be a good option to use. You don‘t want to use allow_nil, because if the attribute is in values but has a value nil, Sequel will attempt to insert a NULL value into the database, instead of using the database‘s default.
- :allow_nil - Whether to skip the validation if the value is nil.
- :if - A symbol (indicating an instance_method) or proc (which is instance_evaled) skipping this validation if it returns nil or false.
- :tag - The tag to use for this validation.

[Source]

         # File lib/sequel/plugins/validation_class_methods.rb, line 160
    160:         def validates_each(*atts, &block)
    161:           opts = extract_options!(atts)
    162:           blk = if (i = opts[:if]) || (am = opts[:allow_missing]) || (an = opts[:allow_nil]) || (ab = opts[:allow_blank])
    163:             proc do |o,a,v|
    164:               next if i && !validation_if_proc(o, i)
    165:               next if an && Array(v).all?{|x| x.nil?}
    166:               next if ab && Array(v).all?{|x| x.blank?}
    167:               next if am && Array(a).all?{|x| !o.values.has_key?(x)}
    168:               block.call(o,a,v)
    169:             end
    170:           else
    171:             block
    172:           end
    173:           tag = opts[:tag]
    174:           atts.each do |a|
    175:             a_vals = @validation_mutex.synchronize{validations[a] ||= []}
    176:             if tag && (old = a_vals.find{|x| x[0] == tag})
    177:               old[1] = blk
    178:             else
    179:               a_vals << [tag, blk]
    180:             end
    181:           end
    182:         end

validates_format_of(*atts)

Validates the format of an attribute, checking the string representation of the value against the regular expression provided by the :with option.

Possible Options:

- :message - The message to use (default: ‘is invalid’)
- :with - The regular expression to validate the value with (required).

[Source]

         # File lib/sequel/plugins/validation_class_methods.rb, line 190
    190:         def validates_format_of(*atts)
    191:           opts = {
    192:             :message => 'is invalid',
    193:             :tag => :format,
    194:           }.merge!(extract_options!(atts))
    195:
    196:           unless opts[:with].is_a?(Regexp)
    197:             raise ArgumentError, "A regular expression must be supplied as the :with option of the options hash"
    198:           end
    199:
    200:           atts << opts
    201:           validates_each(*atts) do |o, a, v|
    202:             o.errors.add(a, opts[:message]) unless v.to_s =~ opts[:with]
    203:           end
    204:         end

validates_inclusion_of(*atts)

Validates that an attribute is within a specified range or set of values.

Possible Options:

- :in - An array or range of values to check for validity (required)
- :message - The message to use (default: ‘is not in range or set: <specified range>’)

[Source]

         # File lib/sequel/plugins/validation_class_methods.rb, line 316
    316:         def validates_inclusion_of(*atts)
    317:           opts = extract_options!(atts)
    318:           unless opts[:in] && opts[:in].respond_to?(:include?)
    319:             raise ArgumentError, "The :in parameter is required, and respond to include?"
    320:           end
    321:           opts[:message] ||= "is not in range or set: #{opts[:in].inspect}"
    322:           atts << opts
    323:           validates_each(*atts) do |o, a, v|
    324:             o.errors.add(a, opts[:message]) unless opts[:in].include?(v)
    325:           end
    326:         end

validates_length_of(*atts)

Validates the length of an attribute.

Possible Options:

- :is - The exact size required for the value to be valid (no default)
- :maximum - The maximum size allowed for the value (no default)
- :message - The message to use (no default, overrides :too_long, :too_short, and :wrong_length options if present)
- :minimum - The minimum size allowed for the value (no default)
- :too_long - The message to use use if it the value is too long (default: ‘is too long’)
- :too_short - The message to use use if it the value is too short (default: ‘is too short’)
- :within - The array/range that must include the size of the value for it to be valid (no default)
- :wrong_length - The message to use use if it the value is not valid (default: ‘is the wrong length’)

[Source]

         # File lib/sequel/plugins/validation_class_methods.rb, line 218
    218:         def validates_length_of(*atts)
    219:           opts = {
    220:             :too_long     => 'is too long',
    221:             :too_short    => 'is too short',
    222:             :wrong_length => 'is the wrong length'
    223:           }.merge!(extract_options!(atts))
    224:
    225:           opts[:tag] ||= ([:length] + [:maximum, :minimum, :is, :within].reject{|x| !opts.include?(x)}).join('-').to_sym
    226:           atts << opts
    227:           validates_each(*atts) do |o, a, v|
    228:             if m = opts[:maximum]
    229:               o.errors.add(a, opts[:message] || opts[:too_long]) unless v && v.size <= m
    230:             end
    231:             if m = opts[:minimum]
    232:               o.errors.add(a, opts[:message] || opts[:too_short]) unless v && v.size >= m
    233:             end
    234:             if i = opts[:is]
    235:               o.errors.add(a, opts[:message] || opts[:wrong_length]) unless v && v.size == i
    236:             end
    237:             if w = opts[:within]
    238:               o.errors.add(a, opts[:message] || opts[:wrong_length]) unless v && w.include?(v.size)
    239:             end
    240:           end
    241:         end

validates_not_string(*atts)

Validates whether an attribute is not a string. This is generally useful in conjunction with raise_on_typecast_failure = false, where you are passing in string values for non-string attributes (such as numbers and dates). If typecasting fails (invalid number or date), the value of the attribute will be a string in an invalid format, and if typecasting succeeds, the value will not be a string.

Possible Options:

- :message - The message to use (default: ‘is a string’ or ‘is not a valid (integer|datetime|etc.)’ if the type is known)

[Source]

         # File lib/sequel/plugins/validation_class_methods.rb, line 252
    252:         def validates_not_string(*atts)
    253:           opts = {
    254:             :tag => :not_string,
    255:           }.merge!(extract_options!(atts))
    256:           atts << opts
    257:           validates_each(*atts) do |o, a, v|
    258:             if v.is_a?(String)
    259:               unless message = opts[:message]
    260:                 message = if sch = o.db_schema[a] and typ = sch[:type]
    261:                   "is not a valid #{typ}"
    262:                 else
    263:                   "is a string"
    264:                 end
    265:               end
    266:               o.errors.add(a, message)
    267:             end
    268:           end
    269:         end

validates_numericality_of(*atts)

Validates whether an attribute is a number.

Possible Options:

- :message - The message to use (default: ‘is not a number’)
- :only_integer - Whether only integers are valid values (default: false)

[Source]

         # File lib/sequel/plugins/validation_class_methods.rb, line 276
    276:         def validates_numericality_of(*atts)
    277:           opts = {
    278:             :message => 'is not a number',
    279:             :tag => :numericality,
    280:           }.merge!(extract_options!(atts))
    281:           atts << opts
    282:           validates_each(*atts) do |o, a, v|
    283:             begin
    284:               if opts[:only_integer]
    285:                 Kernel.Integer(v.to_s)
    286:               else
    287:                 Kernel.Float(v.to_s)
    288:               end
    289:             rescue
    290:               o.errors.add(a, opts[:message])
    291:             end
    292:           end
    293:         end

validates_presence_of(*atts)

Validates the presence of an attribute. Requires the value not be blank, with false considered present instead of absent.

Possible Options:

- :message - The message to use (default: ‘is not present’)

[Source]

         # File lib/sequel/plugins/validation_class_methods.rb, line 300
    300:         def validates_presence_of(*atts)
    301:           opts = {
    302:             :message => 'is not present',
    303:             :tag => :presence,
    304:           }.merge!(extract_options!(atts))
    305:           atts << opts
    306:           validates_each(*atts) do |o, a, v|
    307:             o.errors.add(a, opts[:message]) if v.blank? && v != false
    308:           end
    309:         end

validates_uniqueness_of(*atts)

Validates only if the fields in the model (specified by atts) are unique in the database. Pass an array of fields instead of multiple fields to specify that the combination of fields must be unique, instead of that each field should have a unique value.

This means that the code:

      validates_uniqueness_of([:column1, :column2])

validates the grouping of column1 and column2 while

      validates_uniqueness_of(:column1, :column2)

validates them separately.

You should also add a unique index in the database, as this suffers from a fairly obvious race condition.

Possible Options:

- :message - The message to use (default: ‘is already taken’)

[Source]

         # File lib/sequel/plugins/validation_class_methods.rb, line 344
    344:         def validates_uniqueness_of(*atts)
    345:           opts = {
    346:             :message => 'is already taken',
    347:             :tag => :uniqueness,
    348:           }.merge!(extract_options!(atts))
    349:
    350:           atts << opts
    351:           validates_each(*atts) do |o, a, v|
    352:             error_field = a
    353:             a = Array(a)
    354:             v = Array(v)
    355:             ds = o.class.filter(a.zip(v))
    356:             num_dups = ds.count
    357:             allow = if num_dups == 0
    358:               # No unique value in the database
    359:               true
    360:             elsif num_dups > 1
    361:               # Multiple "unique" values in the database!!
    362:               # Someone didn't add a unique index
    363:               false
    364:             elsif o.new?
    365:               # New record, but unique value already exists in the database
    366:               false
    367:             elsif ds.first === o
    368:               # Unique value exists in database, but for the same record, so the update won't cause a duplicate record
    369:               true
    370:             else
    371:               false
    372:             end
    373:             o.errors.add(error_field, opts[:message]) unless allow
    374:           end
    375:         end

[Validate]