Module: ActiveRecord::AttributeMethods::Read

### Home Classes Methods

### In Files

- lib/active_record/attribute_methods/read.rb

### Namespace

- MODULE ActiveRecord::AttributeMethods::Read::ClassMethods

### Methods

- #read_attribute
- #unserializable_attribute?
- #unserialize_attribute

### Files

- README.rdoc

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# ActiveRecord::AttributeMethods::Read

### Constants

ATTRIBUTE_TYPES_CACHED_BY_DEFAULT

### Public Instance Methods

read_attribute(attr_name) click to toggle source

Returns the value of the attribute identified by `attr_name` after it has been typecast (for example, “2004-12-12” in a data column is cast to a date object, like Date.new(2004, 12, 12)).

    # File lib/active_record/attribute_methods/read.rb, line 75
    def read_attribute(attr_name)
      attr_name = attr_name.to_s
      attr_name = self.class.primary_key if attr_name == 'id'
      value = @attributes[attr_name]
      unless value.nil?
        if column = column_for_attribute(attr_name)
          if unserializable_attribute?(attr_name, column)
            unserialize_attribute(attr_name)
          else
            column.type_cast(value)
          end
        else
          value
        end
      else
        nil
      end
    end

unserializable_attribute?(attr_name, column) click to toggle source

Returns true if the attribute is of a text column and marked for serialization.

    # File lib/active_record/attribute_methods/read.rb, line 95
    def unserializable_attribute?(attr_name, column)
      column.text? && self.class.serialized_attributes[attr_name]
    end

unserialize_attribute(attr_name) click to toggle source

Returns the unserialized object of the attribute.

    # File lib/active_record/attribute_methods/read.rb, line 100
    def unserialize_attribute(attr_name)
      unserialized_object = object_from_yaml(@attributes[attr_name])

      if unserialized_object.is_a?(self.class.serialized_attributes[attr_name]) || unserialized_object.nil?
        @attributes.frozen? ? unserialized_object : @attributes[attr_name] = unserialized_object
      else
        raise SerializationTypeMismatch,
          "#{attr_name} was supposed to be a #{self.class.serialized_attributes[attr_name]}, but was a #{unserialized_object.class.to_s}"
      end
    end

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