Question

我试图在Rails 5中通过ajax创建关联模型Comment for Post，但是得到了错误。

帖子中的

ArgumentError＃show

显示/home/mnml/rails/ajax-app/app/views/comments/_form.html.erb第2行：

错误的参数数量（给定1，预期为0）

的routes.rb

  resources :posts, only: [:new, :create, :show, :destroy] do 
    resources :comments, only: [:new, :create, :show, :destroy]
  end

post.rb

  belongs_to :user
  has_many :comments

comment.rb

  belongs_to :user, optional: true
  belongs_to :post

posts_controller.rb

  def show
    @post = Post.find(params[:id])
    @comment = @post.comments.build
    @comments = @post.comments
  end

comments_controller.rb

  def new
    @post = Post.find(params[:post_id])
    @comment = @post.comments.build
  end

  def create
    @post = Post.find(params[:post_id])
    @comment = @post.comments.build(comment_params)
    @comment.user_id = current_user.id

    respond_to do |format|
      if @comment.save
        format.html { redirect_to @comment.post, notice: 'Comment was successfully created.' }
        #format.json { render @comment, status: :created, location: @comment }
        format.js
      else
        format.html { render :new }
        format.json { render json: @comment.errors.full_messages, status: :unprocessable_entity }
      end
    end
  end

  private
    def comment_params
      params.require(:comment).permit(:description)
    end

文章/ show.html.erb

<%= render "comments/form"%>

评论/ _form.html.erb

<form>
<%= form_with [@post, @post.comments.build], id: :new_comment do |form| %>

  <div class="form-group">
    <%= form.label :description %>
    <%= form.text_field :description, id: :comment_description, class: "form-control" %>
  </div>
  <div class="form-group">
    <%= form.submit "Comment it", class: "btn btn-default", data: { "disable-with": "Comment is saving..." } %>
  </div>
<% end %>
</form>

评论/ create.js.erb

$('#comments').prepend('<%= j render(@comment) %>')

我犯错误的地方？谢谢你的帮助

Answer 1

您需要在form_with文件

中拨打_form.html.erb这样的内容

<%= form_with model: [@post, @post.comments.build], id: :new_comment do |form| %>

Rails 5（ajax）：参数个数错误（给定1，预期为0）

1 个答案: