module ActiveRecord::AttributeMethods::Query

Active Record Attribute Methods Query

Adds query methods for attributes that return either true or false depending on the attribute type and value.

For Boolean attributes this will return true if the value is present and return false otherwise:

class Product < ActiveRecord::Base
end

product = Product.new(archived: false)
product.archived? # => false
product.archived = true
product.archived? # => true

For Numeric attributes this will return true if the value is a non-zero number and return false otherwise:

product.inventory_count = 0
product.inventory_count? # => false
product.inventory_count = 1
product.inventory_count? # => true

For other attributes it will return true if the value is present and return false otherwise:

product.name = nil
product.name? # => false
product.name = " "
product.name? # => false
product.name = "Orange"
product.name? # => true

Public Instance Methods

query_attribute (attr_name)

Source

# File lib/active_record/attribute_methods/query.rb, line 47
def query_attribute(attr_name)
  value = self.public_send(attr_name)

  query_cast_attribute(attr_name, value)
end

Returns true or false for the attribute identified by attr_name, depending on the attribute type and value.

Also aliased as: attribute?

Private Instance Methods

attribute? (attr_name)

Alias for: query_attribute

query_cast_attribute (attr_name, value)

Source

# File lib/active_record/attribute_methods/query.rb, line 63
def query_cast_attribute(attr_name, value)
  case value
  when true        then true
  when false, nil  then false
  else
    if !type_for_attribute(attr_name) { false }
      if Numeric === value || !value.match?(/[^0-9]/)
        !value.to_i.zero?
      else
        return false if ActiveModel::Type::Boolean::FALSE_VALUES.include?(value)
        !value.blank?
      end
    elsif value.respond_to?(:zero?)
      !value.zero?
    else
      !value.blank?
    end
  end
end