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Class: ActiveModel::Type::Value

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Subclasses:
BigInteger, Binary, Boolean, Date, DateTime, Decimal, Float, ImmutableString, Integer, String, Time, ActiveRecord::Encryption::EncryptedAttributeType, ActiveRecord::Type::Date, ActiveRecord::Type::DateTime, ActiveRecord::Type::DecimalWithoutScale, ActiveRecord::Type::Json, ActiveRecord::Type::Text, ActiveRecord::Type::Time, ActiveRecord::Type::UnsignedInteger, ActiveRecord::ConnectionAdapters::SQLite3Adapter::SQLite3Integer, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Array, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Bit, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::BitVarying, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Bytea, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Cidr, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Date, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::DateTime, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Decimal, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Enum, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Hstore, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Inet, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Interval, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Jsonb, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::LegacyPoint, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Macaddr, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Money, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Oid, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Point, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Range, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::SpecializedString, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Timestamp, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::TimestampWithTimeZone, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Uuid, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Vector, ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Xml
Super Chains via Extension / Inclusion / Inheritance
Instance Chain:
self, SerializeCastValue
Inherits: Object
Defined in: activemodel/lib/active_model/type/value.rb

Overview

Active Model Value Type

The base class for all attribute types. This class also serves as the default type for attributes that do not specify a type.

Class Method Summary

Instance Attribute Summary

Instance Method Summary

SerializeCastValue - Included

#initialize, #itself_if_serialize_cast_value_compatible

Constructor Details

.new(precision: nil, limit: nil, scale: nil) ⇒ Value

Initializes a type with three basic configuration settings: precision, limit, and scale. The Value base class does not define behavior for these settings. It uses them for equality comparison and hash key generation only.

[ GitHub ] 

  


# File 'activemodel/lib/active_model/type/value.rb', line 19



def initialize(precision: nil, limit: nil, scale: nil)
  super()
  @precision = precision
  @scale = scale
  @limit = limit
end


  







Instance Attribute Details



  

    #binary?  ⇒ Boolean  (readonly)
  

  

    This method is for internal use only.
  



  

    
These predicates are not documented, as I need to look further into
their use, and see if they can be removed entirely.

  





  


  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 79



def binary? # :nodoc:
  false
end


  








  

    #limit   (readonly)
  

  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 13



attr_reader :precision, :scale, :limit


  








  

    #mutable?  ⇒ Boolean  (readonly)
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 142



def mutable? # :nodoc:
  true
end


  








  

    #precision   (readonly)
  

  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 13



attr_reader :precision, :scale, :limit


  








  

    #scale   (readonly)
  

  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 13



attr_reader :precision, :scale, :limit


  








  

    #serialized?  ⇒ Boolean  (readonly)
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 138



def serialized? # :nodoc:
  false
end


  







Instance Method Details



  

    #==(other)  
    Also known as: #eql?
  

  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 123



def ==(other)
  self.class == other.class &&
    precision == other.precision &&
    scale == other.scale &&
    limit == other.limit
end


  








  

    #as_json  
  



  

    
  





  
Raises:


    
  
  • 
    (NoMethodError)
  
    • 





  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 146



def as_json(*)
  raise NoMethodError
end


  








  

    #as_schema_json  
  

  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 150



def as_schema_json
  { "precision" => precision, "scale" => scale, "limit" => limit }
end


  








  

    #assert_valid_value(_)  
  

  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 135



def assert_valid_value(_)
end


  








  

    #cast(value)  
  



  

    
::ActiveModel::Type casts a value from user input (e.g. from a setter). This value may
be a string from the form builder, or a ruby object passed to a setter.
There is currently no way to differentiate between which source it came
from.


The return value of this method will be returned from
ActiveRecord::AttributeMethods::Read#read_attribute. See also:
#cast_value.


value The raw input, as provided to the attribute setter.

  



  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 59



def cast(value)
  cast_value(value) unless value.nil?
end


  








  

    #cast_value(value)   (private)
  



  

    
Convenience method for types which do not need separate type casting
behavior for user and database inputs. Called by #cast for
values except nil.

  



  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 164



def cast_value(value) # :doc:
  value
end


  








  

    #changed?(old_value, new_value, _new_value_before_type_cast)  ⇒ Boolean 
  



  

    
Determines whether a value has changed for dirty checking. old_value
and new_value will always be type-cast. Types should not need to
override this method.

  





  


  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 86



def changed?(old_value, new_value, _new_value_before_type_cast)
  old_value != new_value
end


  








  

    #changed_in_place?(raw_old_value, new_value)  ⇒ Boolean 
  



  

    
Determines whether the mutable value has been modified since it was
read. Returns false by default. If your type returns an object
which could be mutated, you should override this method. You will need
to either:


    

  • pass new_value to #serialize and compare it to
raw_old_value
    • 



or


    

  • pass raw_old_value to #deserialize and compare it to
new_value
    • 



raw_old_value The original value, before being passed to
#deserialize.


new_value The current value, after type casting.

  





  


  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 107



def changed_in_place?(raw_old_value, new_value)
  false
end


  








  

    #deserialize(value)  
    Also known as: #serialize
  



  

    
Converts a value from database input to the appropriate ruby type. The
return value of this method will be returned from
ActiveRecord::AttributeMethods::Read#read_attribute. The default
implementation just calls #cast.


value The raw input, as provided from the database.

  



  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 45



def deserialize(value)
  cast(value)
end


  








  

    #eql?(other)  
  



  

    
Alias for #==.

  



  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 129



alias eql? ==


  








  

    #force_equality?(_value)  ⇒ Boolean 
  

  

    This method is for internal use only.
  



  

    
  





  


  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 115



def force_equality?(_value) # :nodoc:
  false
end


  








  

    #hash  
  

  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 131



def hash
  [self.class, precision, scale, limit].hash
end


  








  

    #init_from_schema_json(coder, references)  
  

  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 154



def init_from_schema_json(coder, references)
  @precision = coder["precision"]
  @scale = coder["scale"]
  @limit = coder["limit"]
end


  








  

    #map(value)  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 119



def map(value, &) # :nodoc:
  value
end


  








  

    #serializable?(value)  ⇒ Boolean 
  



  

    
Returns true if this type can convert value to a type that is usable
by the database.  For example a boolean type can return true if the
value parameter is a Ruby boolean, but may return false if the value
parameter is some other object.

  





  


  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 30



def serializable?(value, &)
  true
end


  








  

    #serialize(value)  
  



  

    
Casts a value from the ruby type to a type that the database knows how
to understand. The returned value from this method should be a
String, ::Numeric, Date, Time, ::Symbol, true, false, or
nil.

  



  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 67



def serialize(value)
  value
end


  








  

    #type  
  



  

    
Returns the unique type name as a ::Symbol. Subclasses should override
this method.

  



  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 36



def type
end


  








  

    #type_cast_for_schema(value)  
  

  

    This method is for internal use only.
  



  

    
::ActiveModel::Type casts a value for schema dumping. This method is private, as we are
hoping to remove it entirely.

  



  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 73



def type_cast_for_schema(value) # :nodoc:
  value.inspect
end


  








  

    #value_constructed_by_mass_assignment?(_value)  ⇒ Boolean 
  

  

    This method is for internal use only.
  



  

    
  





  


  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/type/value.rb', line 111



def value_constructed_by_mass_assignment?(_value) # :nodoc:
  false
end