new + save 和 create 之间的 rails 差异 [英] Differences in rails between new + save and create

问题描述

我是 Rails 新手，不明白使用 new+save 方法和使用 create 方法之间的区别.

I'm new to rails and I don't understand the differences between the use of new+save methods and the create method.

def create
    @item = Item.new(params[:item])

    respond_to do |format|
      if @item.save
        format.html { redirect_to @item, notice: 'Item was successfully created.' }
        format.json { render json: @item, status: :created, location: @item }
      else
        format.html { render action: "new" }
        format.json { render json: @item.errors, status: :unprocessable_entity }
      end
    end
end

和:

  def create

    respond_to do |format|
      if Item.create(params[:item])
        format.html { redirect_to @item, notice: 'Item was successfully created.' }
        format.json { render json: @item, status: :created, location: @item }
      else
        format.html { render action: "new" }
        format.json { render json: @item.errors, status: :unprocessable_entity }
      end
    end
  end

推荐答案

内部 create 调用 new 然后 save 无论如何:

Internally create calls new then save anyway:

  def create(attributes = nil, options = {}, &block)
    if attributes.is_a?(Array)
      attributes.collect { |attr| create(attr, options, &block) }
    else
      object = new(attributes, options, &block)
      object.save
      object
    end
  end

这篇关于new + save 和 create 之间的 rails 差异的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！