Module: CouchbaseOrm::HasMany

Included in:
Base
Defined in:
lib/couchbase-orm/utilities/has_many.rb

Instance Method Summary collapse

Instance Method Details

#build_index(type, klass, remote_class, remote_method, through_key, foreign_key) ⇒ Object 



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# File 'lib/couchbase-orm/utilities/has_many.rb', line 65

def build_index(type, klass, remote_class, remote_method, through_key, foreign_key)
    case type
    when :n1ql
        build_index_n1ql(klass, remote_class, remote_method, through_key, foreign_key)
    when :view
        build_index_view(klass, remote_class, remote_method, through_key, foreign_key)
    else
        raise 'type is unknown'
    end
end

#build_index_n1ql(klass, remote_class, remote_method, through_key, foreign_key) ⇒ Object 



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# File 'lib/couchbase-orm/utilities/has_many.rb', line 94

def build_index_n1ql(klass, remote_class, remote_method, through_key, foreign_key)
    if remote_class
        klass.class_eval do
          n1ql remote_method, emit_key: 'id', query_fn: proc { |bucket, values, options|
            raise ArgumentError, "values[0] must not be blank" if values[0].blank?
            cluster.query("SELECT raw #{through_key} FROM `#{bucket.name}` where type = \"#{design_document}\" and #{foreign_key} = #{quote(values[0])}", options)
          }
        end
    else
        klass.class_eval do
            index_n1ql foreign_key, validate: false
        end
    end
end

#build_index_view(klass, remote_class, remote_method, through_key, foreign_key) ⇒ Object 



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# File 'lib/couchbase-orm/utilities/has_many.rb', line 76

def build_index_view(klass, remote_class, remote_method, through_key, foreign_key)
    if remote_class
        klass.class_eval do
            view remote_method, map: <<-EMAP
                function(doc) {
                    if (doc.type === "{{design_document}}" && doc.#{through_key}) {
                    emit(doc.#{foreign_key}, null);
                    }
                }
            EMAP
        end
    else
        klass.class_eval do
            index_view foreign_key, validate: false
        end
    end
end

#has_many(model, class_name: nil, foreign_key: nil, through: nil, through_class: nil, through_key: nil, type: :view, **options) ⇒ Object

:foreign_key, :class_name, :through



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# File 'lib/couchbase-orm/utilities/has_many.rb', line 4

def has_many(model, class_name: nil, foreign_key: nil, through: nil, through_class: nil, through_key: nil, type: :view, **options)
    class_name = (class_name || model.to_s.singularize.camelcase).to_s
    foreign_key = (foreign_key || ActiveSupport::Inflector.foreign_key(self.name)).to_sym
    if through || through_class
        remote_class = class_name
        class_name = (through_class || through.to_s.camelcase).to_s
        through_key = (through_key || "#{remote_class.underscore}_id").to_sym
        remote_method = :"by_#{foreign_key}_with_#{through_key}"
    else
        remote_method = :"find_by_#{foreign_key}"
    end

    instance_var = "@__assoc_#{model}"

    klass = begin
                class_name.constantize
            rescue NameError
                warn "WARNING: #{class_name} referenced in #{self.name} before it was aded"

                # Open the class early - load order will have to be changed to prevent this.
                # Warning notice required as a misspelling will not raise an error
                Object.class_eval <<-EKLASS
                    class #{class_name} < CouchbaseOrm::Base
                        attribute :#{foreign_key}
                    end
                EKLASS
                class_name.constantize
            end

    build_index(type, klass, remote_class, remote_method, through_key, foreign_key)

    if remote_class
        define_method(model) do
            return self.instance_variable_get(instance_var) if instance_variable_defined?(instance_var)

            remote_klass = remote_class.constantize
            raise ArgumentError, "Can't find #{remote_method} without an id" unless self.id.present?
            enum = klass.__send__(remote_method, key: self.id) { |row|
                case type
                when :n1ql
                    remote_klass.find(row)
                when :view
                    remote_klass.find(row[through_key])
                else
                    raise 'type is unknown'
                end
            }

            self.instance_variable_set(instance_var, enum)
        end
    else
        define_method(model) do
            return self.instance_variable_get(instance_var) if instance_variable_defined?(instance_var)
            self.instance_variable_set(instance_var, self.id ? klass.__send__(remote_method, self.id) : [])
        end
    end

    @associations ||= []
    @associations << [model, options[:dependent]]
end