Class: Tessa::DynamicExtensions::MultipleRecord

Inherits:
Tessa::DynamicExtensions show all
Defined in:
lib/tessa/model/dynamic_extensions.rb

Instance Attribute Summary

Attributes inherited from Tessa::DynamicExtensions

#field

Instance Method Summary collapse

Methods inherited from Tessa::DynamicExtensions

#initialize, #name

Constructor Details

This class inherits a constructor from Tessa::DynamicExtensions

Instance Method Details

#build(mod) ⇒ Object 



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# File 'lib/tessa/model/dynamic_extensions.rb', line 67

def build(mod)
  mod.class_eval <<~CODE, __FILE__, __LINE__ + 1
      def #{name}
        field = self.class.tessa_fields["#{name}".to_sym]
        tessa_ids = field.id(on: self) - #{name}_attachments.map(&:key)
        
        @#{name} ||= [
          *#{name}_attachments.map { |a| Tessa::ActiveStorage::AssetWrapper.new(a) },
        ]
      end

      def #{field.id_field}
        [
          # Use the attachment's key
          *#{name}_attachments.map(&:key),
        ]
      end

      def #{name}=(attachables)
        # Every new upload is going to ActiveStorage
        a = @active_storage_attached_#{name} ||=
          ::ActiveStorage::Attached::Many.new("#{name}", self, dependent: :purge_later)

        case attachables
        when Tessa::AssetChangeSet
          attachables.changes.select(&:remove?).each do |change|
            if existing = #{name}_attachments.find { |a| a.key == change.id }
              existing.destroy
            else
              ids = self.#{field.id_field}
              ids&.delete(change.id.to_i)
              self.#{field.id_field} = ids&.any? ? ids : nil
            end
          end
          attachables.changes.select(&:add?).each do |change|
            next if #{field.id_field}.include? change.id

            a.attach(change.id)
          end
        when nil
          a.detach
          self.#{field.id_field} = nil
        else
          a.attach(*attachables)
          self.#{field.id_field} = nil
        end
      end

      def attributes
        super.merge({
          '#{field.id_field}' => #{field.id_field},
          '_tessa_#{field.id_field}' => super['#{field.id_field}']
        })
      end
    CODE
  mod
end