Class: DataMapper::Query::Conditions::Comparison

Inherits:
Object
  • Object
show all
Defined in:
lib/dm-core/query/conditions/comparison.rb

Overview

An abstract class which provides easy access to comparison operators

Examples:

Creating a new comparison

Comparison.new(:eql, MyClass.my_property, "value")

Class Method Summary collapse

Class Method Details

.new(slug, subject, value) ⇒ DataMapper::Query::Conditions::AbstractComparison

Creates a new Comparison instance

The returned instance will be suitable for matching the given subject (property or relationship) against the value.

Examples:

Comparison.new(:eql, MyClass.properties[:id], 1)



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# File 'lib/dm-core/query/conditions/comparison.rb', line 58

def self.new(slug, subject, value)
  if klass = comparison_class(slug)
    klass.new(subject, value)
  else
    raise ArgumentError, "No Comparison class for #{slug.inspect} has been defined"
  end
end

.slugs ⇒ Array<Symbol>

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns an array of all slugs registered with Comparison



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# File 'lib/dm-core/query/conditions/comparison.rb', line 71

def self.slugs
  AbstractComparison.descendants.map { |comparison_class| comparison_class.slug }
end