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 129

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
            raise CouchbaseOrm::StrictLoadingViolationError, "#{self.class} is marked as strict_loading and #{assoc} cannot be lazily loaded." if strict_loading?

            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, "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
end

#define_non_cyclic_method(name, &block) ⇒ Object 



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# File 'lib/couchbase-orm/associations.rb', line 133

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 60

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 options[:polymorphic]
            ::CouchbaseOrm.try_load(ref_value) if ref_value
        else
            raise CouchbaseOrm::StrictLoadingViolationError, "#{self.class} is marked as strict_loading and #{assoc} cannot be lazily loaded." if strict_loading?

            assoc.constantize.find(ref_value) if ref_value
        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, "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

    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