def arel_insert
        table  = self.class.arel_tables[entity.class.table_name][hydra_attribute.backend_type]
        fields = {}
        fields[table[:entity_id]]          = entity.id
        fields[table[:hydra_attribute_id]] = hydra_attribute.id
        fields[table[:value]]              = value
        fields[table[:created_at]]         = Time.now
        fields[table[:updated_at]]         = Time.now
        table.compile_insert(fields)
      end
def arel_insert
        table  = self.class.arel_tables[entity.class.table_name][hydra_attribute.backend_type]
        fields = {}
        fields[table[:entity_id]]          = entity.id
        fields[table[:hydra_attribute_id]] = hydra_attribute.id
        fields[table[:value]]              = value
        fields[table[:created_at]]         = Time.now
        fields[table[:updated_at]]         = Time.now
        table.compile_insert(fields)
      end
Creates arel insert manager

 @return [Arel::InsertManager]