instance method `column_for_attribute`

Ruby on Rails 4.2.9

Since v4.2.9 Last seen in v6.0.6

Available in: v4.2.9 v5.2.8.1 v6.0.6

Compare with:

column_for_attribute(name)

Returns the column object for the named attribute. Returns nil if the named attribute does not exist.

class Person < ActiveRecord::Base
end

person = Person.new
person.column_for_attribute(:name) # the result depends on the ConnectionAdapter
# => #<ActiveRecord::ConnectionAdapters::Column:0x007ff4ab083980 @name="name", @sql_type="varchar(255)", @null=true, ...>

person.column_for_attribute(:nothing)
# => nil

Parameters

name req

Source

# File activerecord/lib/active_record/attribute_methods.rb, line 206
      def column_for_attribute(name)
        column = columns_hash[name.to_s]
        if column.nil?
          ActiveSupport::Deprecation.warn(<<-MSG.squish)
            `#column_for_attribute` will return a null object for non-existent
            columns in Rails 5. Use `#has_attribute?` if you need to check for
            an attribute's existence.
          MSG
        end
        column
      end

Defined in activerecord/lib/active_record/attribute_methods.rb line 206 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveRecord::AttributeMethods::ClassMethods

Signature

Parameters