Module: ActiveRecord::AttributeMethods::Read

Extended by:
ActiveSupport::Concern
Defined in:
activerecord/lib/active_record/attribute_methods/read.rb

Defined Under Namespace

Modules: ClassMethods

Constant Summary collapse

ATTRIBUTE_TYPES_CACHED_BY_DEFAULT =
[:datetime, :timestamp, :time, :date]

Instance Method Summary collapse

Methods included from ActiveSupport::Concern

append_features, extended, included

Instance Method Details

#_read_attribute(attr_name) ⇒ Object


110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
# File 'activerecord/lib/active_record/attribute_methods/read.rb', line 110

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
  end
end

#read_attribute(attr_name) ⇒ Object

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)).


101
102
103
104
105
106
107
108
# File 'activerecord/lib/active_record/attribute_methods/read.rb', line 101

def read_attribute(attr_name)
  method = "_#{attr_name}"
  if respond_to? method
    send method if @attributes.has_key?(attr_name.to_s)
  else
    _read_attribute attr_name
  end
end

#unserializable_attribute?(attr_name, column) ⇒ Boolean

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

Returns:

  • (Boolean)

128
129
130
# File 'activerecord/lib/active_record/attribute_methods/read.rb', line 128

def unserializable_attribute?(attr_name, column)
  column.text? && self.class.serialized_attributes.include?(attr_name)
end

#unserialize_attribute(attr_name) ⇒ Object

Returns the unserialized object of the attribute.


133
134
135
136
137
138
# File 'activerecord/lib/active_record/attribute_methods/read.rb', line 133

def unserialize_attribute(attr_name)
  coder = self.class.serialized_attributes[attr_name]
  unserialized_object = coder.load(@attributes[attr_name])

  @attributes.frozen? ? unserialized_object : @attributes[attr_name] = unserialized_object
end