Module: CouchbaseOrm::Associations::ClassMethods

Defined in:
lib/couchbase-orm/associations.rb

Instance Method Summary collapse

Instance Method Details

#associations ⇒ Object 



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# File 'lib/couchbase-orm/associations.rb', line 138

def associations
  @associations || []
end

#belongs_to(name, **options) ⇒ Object

Defines a belongs_to association for the model



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# File 'lib/couchbase-orm/associations.rb', line 12

def belongs_to(name, **options)
  @associations ||= []
  @associations << [name.to_sym, options[:dependent]]

  ref = options[:foreign_key] || :"#{name}_id"
  ref_ass = :"#{ref}="
  instance_var = :"@__assoc_#{name}"

    # Class reference
  assoc = (options[:class_name] || name.to_s.camelize).to_s

    # Create the local setter / getter
  attribute(ref) { |value|
    remove_instance_variable(instance_var) if instance_variable_defined?(instance_var)
    value
  }

    # Define reader
  define_method(name) do
    return instance_variable_get(instance_var) if instance_variable_defined?(instance_var)

    val = if options[:polymorphic]
            ::CouchbaseOrm.try_load(self.send(ref))
          else
            assoc.constantize.find(self.send(ref), quiet: true)
          end
    instance_variable_set(instance_var, val)
    val
  end

    # Define writer
  attr_writer name

  define_method(:"#{name}=") do |value|
    if value
      if !options[:polymorphic]
        klass = assoc.constantize
        raise ArgumentError.new("type mismatch on association: #{klass.design_document} != #{value.class.design_document}") if klass.design_document != value.class.design_document
      end
      self.send(ref_ass, value.id)
    else
      self.send(ref_ass, nil)
    end

    instance_variable_set(instance_var, value)
  end

  define_method(:"#{name}_reset") do
    remove_instance_variable(instance_var) if instance_variable_defined?(instance_var)
  end
end

#define_non_cyclic_method(name, &block) ⇒ Object 



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# File 'lib/couchbase-orm/associations.rb', line 142

def define_non_cyclic_method(name, &block)
  return if method_defined?(name)

  define_method(name) do |*_args|
    result = true
    @_already_called ||= {}
      # Loop prevention for validation of associations
    unless @_already_called[name]
      begin
        @_already_called[name] = true
        result = instance_eval(&block)
      ensure
        @_already_called[name] = false
      end
    end
    result
  end
end

#has_and_belongs_to_many(name, **options) ⇒ Object 



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# File 'lib/couchbase-orm/associations.rb', line 64

def has_and_belongs_to_many(name, **options)
  @associations ||= []
  @associations << [name.to_sym, options[:dependent]]

  ref = options[:foreign_key] || :"#{name.to_s.singularize}_ids"
  ref_ass = :"#{ref}="
  instance_var = :"@__assoc_#{name}"

    # Class reference
  assoc = (options[:class_name] || name.to_s.singularize.camelize).to_s

    # Create the local setter / getter
  attribute(ref) { |value|
    remove_instance_variable(instance_var) if instance_variable_defined?(instance_var)
    value
  }

    # Define reader
  define_method(name) do
    return instance_variable_get(instance_var) if instance_variable_defined?(instance_var)

    ref_value = self.send(ref)
    ref_value = nil if ref_value.respond_to?(:empty?) && ref_value.empty?
    val = if ref_value.nil?
            nil
          elsif options[:polymorphic]
            ::CouchbaseOrm.try_load(ref_value)
          else
            assoc.constantize.find(ref_value, quiet: true)
          end
    val = Array.wrap(val || [])
    instance_variable_set(instance_var, val)
    val
  end

    # Define writer
  attr_writer name

  define_method(:"#{name}=") do |value|
    if value
      if !options[:polymorphic]
        klass = assoc.constantize
        value.each do |v|
          raise ArgumentError.new("type mismatch on association: #{klass.design_document} != #{v.class.design_document}") if klass.design_document != v.class.design_document
        end
      end
      self.send(ref_ass, value.map(&:id))
    else
      self.send(ref_ass, nil)
    end

    instance_variable_set(instance_var, value)
  end

  define_method(:"#{name}_reset") do
    self.remove_instance_variable(instance_var) if self.instance_variable_defined?(instance_var)
  end

  return unless options[:autosave]

  save_method = :"autosave_associated_records_for_#{name}"

  define_non_cyclic_method(save_method) do
    old, new = previous_changes[ref]
    adds = (new || []) - (old || [])
    subs = (old || []) - (new || [])
    update_has_and_belongs_to_many_reverse_association(assoc, adds, true, **options) if adds.any?
    update_has_and_belongs_to_many_reverse_association(assoc, subs, false, **options) if subs.any?
  end

  after_create save_method
  after_update save_method
end