Module: Sequel::Plugins::ValidationClassMethods::ClassMethods
- Defined in:
- lib/sequel/plugins/validation_class_methods.rb
Defined Under Namespace
Classes: Generator
Instance Attribute Summary collapse
-
#validations ⇒ Object
readonly
A hash of associations for this model class.
Instance Method Summary collapse
-
#has_validations? ⇒ Boolean
Returns true if validations are defined.
-
#inherited(subclass) ⇒ Object
Setup the validations hash in the subclass.
-
#skip_superclass_validations ⇒ Object
Instructs the model to skip validations defined in superclasses.
-
#skip_superclass_validations? ⇒ Boolean
Instructs the model to skip validations defined in superclasses.
-
#validate(o) ⇒ Object
Validates the given instance.
-
#validates(&block) ⇒ Object
Defines validations by converting a longhand block into a series of shorthand definitions.
-
#validates_acceptance_of(*atts) ⇒ Object
Validates acceptance of an attribute.
-
#validates_confirmation_of(*atts) ⇒ Object
Validates confirmation of an attribute.
-
#validates_each(*atts, &block) ⇒ Object
Adds a validation for each of the given attributes using the supplied block.
-
#validates_format_of(*atts) ⇒ Object
Validates the format of an attribute, checking the string representation of the value against the regular expression provided by the :with option.
-
#validates_inclusion_of(*atts) ⇒ Object
Validates that an attribute is within a specified range or set of values.
-
#validates_length_of(*atts) ⇒ Object
Validates the length of an attribute.
-
#validates_not_string(*atts) ⇒ Object
Validates whether an attribute is not a string.
-
#validates_numericality_of(*atts) ⇒ Object
Validates whether an attribute is a number.
-
#validates_presence_of(*atts) ⇒ Object
Validates the presence of an attribute.
-
#validates_uniqueness_of(*atts) ⇒ Object
Validates only if the fields in the model (specified by atts) are unique in the database.
Instance Attribute Details
#validations ⇒ Object (readonly)
A hash of associations for this model class. Keys are column symbols, values are arrays of validation procs.
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 22 def validations @validations end |
Instance Method Details
#has_validations? ⇒ Boolean
Returns true if validations are defined.
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 40 def has_validations? !validations.empty? end |
#inherited(subclass) ⇒ Object
Setup the validations hash in the subclass
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 45 def inherited(subclass) super subclass.class_eval do @validation_mutex = Mutex.new @validations = {} end end |
#skip_superclass_validations ⇒ Object
Instructs the model to skip validations defined in superclasses
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 54 def skip_superclass_validations @skip_superclass_validations = true end |
#skip_superclass_validations? ⇒ Boolean
Instructs the model to skip validations defined in superclasses
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 59 def skip_superclass_validations? defined?(@skip_superclass_validations) && @skip_superclass_validations end |
#validate(o) ⇒ Object
Validates the given instance.
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 83 def validate(o) superclass.validate(o) if superclass.respond_to?(:validate) && !skip_superclass_validations? validations.each do |att, procs| v = case att when Array att.collect{|a| o.send(a)} else o.send(att) end procs.each {|tag, p| p.call(o, att, v)} end end |
#validates(&block) ⇒ Object
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
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 78 def validates(&block) Generator.new(self, &block) end |
#validates_acceptance_of(*atts) ⇒ Object
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’)
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 103 def validates_acceptance_of(*atts) opts = { :message => 'is not accepted', :allow_nil => true, :accept => '1', :tag => :acceptance, }.merge!((atts)) atts << opts validates_each(*atts) do |o, a, v| o.errors.add(a, opts[:message]) unless v == opts[:accept] end end |
#validates_confirmation_of(*atts) ⇒ Object
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’)
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 126 def validates_confirmation_of(*atts) opts = { :message => 'is not confirmed', :tag => :confirmation, }.merge!((atts)) atts << opts validates_each(*atts) do |o, a, v| o.errors.add(a, opts[:message]) unless v == o.send(:"#{a}_confirmation") end end |
#validates_each(*atts, &block) ⇒ Object
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.
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 160 def validates_each(*atts, &block) opts = (atts) blk = if (i = opts[:if]) || (am = opts[:allow_missing]) || (an = opts[:allow_nil]) || (ab = opts[:allow_blank]) proc do |o,a,v| next if i && !validation_if_proc(o, i) next if an && Array(v).all?{|x| x.nil?} next if ab && Array(v).all?{|x| x.blank?} next if am && Array(a).all?{|x| !o.values.has_key?(x)} block.call(o,a,v) end else block end tag = opts[:tag] atts.each do |a| a_vals = @validation_mutex.synchronize{validations[a] ||= []} if tag && (old = a_vals.find{|x| x[0] == tag}) old[1] = blk else a_vals << [tag, blk] end end end |
#validates_format_of(*atts) ⇒ Object
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).
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 190 def validates_format_of(*atts) opts = { :message => 'is invalid', :tag => :format, }.merge!((atts)) unless opts[:with].is_a?(Regexp) raise ArgumentError, "A regular expression must be supplied as the :with option of the options hash" end atts << opts validates_each(*atts) do |o, a, v| o.errors.add(a, opts[:message]) unless v.to_s =~ opts[:with] end end |
#validates_inclusion_of(*atts) ⇒ Object
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>’)
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 316 def validates_inclusion_of(*atts) opts = (atts) unless opts[:in] && opts[:in].respond_to?(:include?) raise ArgumentError, "The :in parameter is required, and respond to include?" end opts[:message] ||= "is not in range or set: #{opts[:in].inspect}" atts << opts validates_each(*atts) do |o, a, v| o.errors.add(a, opts[:message]) unless opts[:in].include?(v) end end |
#validates_length_of(*atts) ⇒ Object
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’)
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 218 def validates_length_of(*atts) opts = { :too_long => 'is too long', :too_short => 'is too short', :wrong_length => 'is the wrong length' }.merge!((atts)) opts[:tag] ||= ([:length] + [:maximum, :minimum, :is, :within].reject{|x| !opts.include?(x)}).join('-').to_sym atts << opts validates_each(*atts) do |o, a, v| if m = opts[:maximum] o.errors.add(a, opts[:message] || opts[:too_long]) unless v && v.size <= m end if m = opts[:minimum] o.errors.add(a, opts[:message] || opts[:too_short]) unless v && v.size >= m end if i = opts[:is] o.errors.add(a, opts[:message] || opts[:wrong_length]) unless v && v.size == i end if w = opts[:within] o.errors.add(a, opts[:message] || opts[:wrong_length]) unless v && w.include?(v.size) end end end |
#validates_not_string(*atts) ⇒ Object
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)
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 252 def validates_not_string(*atts) opts = { :tag => :not_string, }.merge!((atts)) atts << opts validates_each(*atts) do |o, a, v| if v.is_a?(String) unless = opts[:message] = if sch = o.db_schema[a] and typ = sch[:type] "is not a valid #{typ}" else "is a string" end end o.errors.add(a, ) end end end |
#validates_numericality_of(*atts) ⇒ Object
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)
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 276 def validates_numericality_of(*atts) opts = { :message => 'is not a number', :tag => :numericality, }.merge!((atts)) atts << opts validates_each(*atts) do |o, a, v| begin if opts[:only_integer] Kernel.Integer(v.to_s) else Kernel.Float(v.to_s) end rescue o.errors.add(a, opts[:message]) end end end |
#validates_presence_of(*atts) ⇒ Object
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’)
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 300 def validates_presence_of(*atts) opts = { :message => 'is not present', :tag => :presence, }.merge!((atts)) atts << opts validates_each(*atts) do |o, a, v| o.errors.add(a, opts[:message]) if v.blank? && v != false end end |
#validates_uniqueness_of(*atts) ⇒ Object
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’)
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# File 'lib/sequel/plugins/validation_class_methods.rb', line 344 def validates_uniqueness_of(*atts) opts = { :message => 'is already taken', :tag => :uniqueness, }.merge!((atts)) atts << opts validates_each(*atts) do |o, a, v| error_field = a a = Array(a) v = Array(v) ds = o.class.filter(a.zip(v)) num_dups = ds.count allow = if num_dups == 0 # No unique value in the database true elsif num_dups > 1 # Multiple "unique" values in the database!! # Someone didn't add a unique index false elsif o.new? # New record, but unique value already exists in the database false elsif ds.first === o # Unique value exists in database, but for the same record, so the update won't cause a duplicate record true else false end o.errors.add(error_field, opts[:message]) unless allow end end |