如何添加用户名进行评论？

Question

用户创建评论时。我们怎么能加上他的名字呢？我尝试过current_user，但显然只是说明当前用户的名字，而不是发表评论的人的姓名。

在评论模型has_many :comments, as: :commentable中的用户模型belongs_to :commentable, polymorphic: true中，在路径中使用resources :users do resources :comments end细分。

视图/评论/ _comments.html.erb

<div id="comments">
<% @comments.each do |comment| %>
    <div class="comment">
        <%= current_user.name %>
        <%= simple_format comment.content %>
    </div>
<% end %>

评论控制器

class CommentsController < ApplicationController
	before_action :load_commentable
  before_action :set_comment, only: [:show, :edit, :update, :destroy]
  before_action :logged_in_user, only: [:create, :destroy]

	def index
		@comments = @commentable.comments
	end

	def new
		@comment = @commentable.comments.new
	end

	def create
		@comment = @commentable.comments.new(comment_params)
		if @comment.save
			@comment.create_activity :create, owner: current_user 
			redirect_to @commentable, notice: "comment created."
		else
			render :new
		end
	end

	def edit
		@comment = current_user.comments.find(params[:id])
	end

	def update
		@comment = current_user.comments.find(params[:id])
		if @comment.update_attributes(comment_params)
			redirect_to @commentable, notice: "Comment was updated."
		else
			render :edit
		end
	end

	def destroy
		@comment = current_user.comments.find(params[:id])
		@comment.destroy
		@comment.create_activity :destroy, owner: current_user
		redirect_to @commentable, notice: "comment destroyed."
	end

private
  def set_comment
    @comment = Comment.find(params[:id])
  end

	def load_commentable
		resource, id = request.path.split('/')[1, 2]
		@commentable = resource.singularize.classify.constantize.find(id)
	end

	def comment_params
		params.require(:comment).permit(:content, :commentable)
	end
end

我通过创建控制器在活动供稿工作中显示了各种名称。我是否有原则可以让它成功，因为我已经尝试过并且失败了。

class ActivitiesController < ApplicationController
 def index
 @activities = PublicActivity::Activity.order("created_at desc").where(owner_id: current_user.following_ids, owner_type: "User")
 end
end

用户迁移

class CreateUsers < ActiveRecord::Migration
def change
create_table :users do |t|
  t.string   :name
  t.string   :email
  t.string   :provider
  t.string   :uid
  t.string   :oauth_token
  t.datetime :oauth_expires_at

  t.timestamps null: false
end
end
end

评论迁移

class CreateComments < ActiveRecord::Migration
def change
create_table :comments do |t|
    t.text :content
    t.belongs_to :commentable, polymorphic: true

  t.timestamps null: false
end
add_index :comments, [:commentable_id, :commentable_type]
end
end

valuations_controller

class ValuationsController < ApplicationController
  before_action :set_valuation, only: [:show, :edit, :update, :destroy]
  before_action :logged_in_user, only: [:create, :destroy]

  def index
    if params[:tag]
      @valuations = Valuation.tagged_with(params[:tag])
    else
      @valuations = Valuation.order('RANDOM()')
    end
  end

  def show
    @valuation = Valuation.find(params[:id])
    @commentable = @valuation
    @comments = @commentable.comments
    @comment = Comment.new
  end

  def new
    @valuation = current_user.valuations.build
    @commentable = @valuation
    @comments = @commentable.comments
    @comment = Comment.new
  end

  def edit
  end

  def create
    @valuation = current_user.valuations.build(valuation_params)
    if @valuation.save
      redirect_to @valuation, notice: 'Value was successfully created'
    else
      @feed_items = []
      render 'pages/home'
  end
end

  def update
    if @valuation.update(valuation_params)
      redirect_to @valuation, notice: 'Value was successfully updated'
    else
      render action: 'edit'
  end
end

  def destroy
    @valuation.destroy
    redirect_to valuations_url
  end

private
    def set_valuation
      @valuation = Valuation.find(params[:id])
    end

    def correct_user
      @valuation = current_user.valuations.find_by(id: params[:id])
      redirect_to valuations_path, notice: "Not authorized to edit this valuation" if @valuation.nil?
    end

    def valuation_params
      params.require(:valuation).permit(:name, :private_submit, :tag_list, :content, :commentable, :comment)
    end
end

感谢您的时间！

Answer 1

假设你有

用户模型：

class User
  has_many :comments
  ...
end

评论模型

class Comment
  belongs_to :user
  ...
end

评论迁移

class CreateComments < ActiveRecord::Migration
  def change
    create_table :comments do |t|
      t.text :content
      t.belongs_to :user, index: true

      t.timestamps null: false
    end
  end
end

您可以通过

获取用户的评论名称

@comment = Comment.find(params[:id])
@comment.user.name

编辑：如果您想使用多态关联，请像这样编辑模型：

class User
  has_many :comments, as: :commentable
  ...
end

class Comment
  belongs_to :commentable, polymorphic: true
  ...
end

编辑：插入评论迁移

class CreateComments < ActiveRecord::Migration
  def change
    create_table :comments do |t|
      t.text :content
      t.references :commentable, polymorphic: true, index: true

      t.timestamps null: false
    end
  end
end

与ValuationsController相关的编辑

1. 您正在寻找创建特定评估评论的用户。 @valuation持有此评论。因此，您可以通过@valuation.commentable.user.name获取用户 - 这假设您的Valuation设置了与Comment模型的正确关联。

2. 删除@commentable = @valuation和@comments = @commentable.comments。它们没有错，但在这种情况下，保持具有相同值的变量没有任何意义。

3. 在'show'动作中，您已经使用Comment.new指定了@comment。删除此行，因为您没有在show动作中创建新对象。

4. 您已经在类顶部的before_action中使用相同的值分配了@valutation。为防止混淆，请在show action中删除此附加作业。

未来调试的线索：如果您的代码无法正常工作，请尝试在rails控制台中运行。我们昨天看到，@comment.commentable.user.name周围的代码是正确的。这告诉我，你的控制器一定有问题。

最终解决方案

将<%= User.find(comment.user_id).name %>添加到_comments.html.erb