Does Resource class always assume @model is reloadable?

In Resource#save:

    def _save(validation_context = nil)
      unless @model.valid?(validation_context)
        fail JSONAPI::Exceptions::ValidationErrors.new(self)
      end

      if defined? @model.save
        saved = @model.save(validate: false)

        unless saved
          if @model.errors.present?
            fail JSONAPI::Exceptions::ValidationErrors.new(self)
          else
            fail JSONAPI::Exceptions::SaveFailed.new
          end
        end
      else
        saved = true
      end
      @model.reload if @reload_needed
      @reload_needed = false

      @save_needed = !saved

      :completed
    end

We check to see if the save action exists but we don't check if the reload action exists.

Why is that? What other types of classes besides ActiveRecord::Base was this intended to work on? Or was this code only intended to work against ActiveRecord?

This is important to know as I'm refactoring for #1006 .

Start at Resource#save, especially the @model.save and @model.reload calls, and review the refactor tracked in #1006 alongside the ActiveRecord::Base assumption. Determine which model interface is intended to be supported; done means the behavior is clarified and the refactor has an explicit, verified contract.