ruby-on-rails - 在自定义位置/ View 中呈现 Rails 教程中的 'micropost feed'？

Question

我遵循了 Michael Hartl 的“Rails 教程”一书，需要在自定义位置 (/members) 而不是站点的根目录中呈现“微博提要”。

我已经更新了 SessionsController，这样当用户登录时，他们将被重定向到新的/members URL，但是成员 View 上需要两个语句，它们会导致错误并阻止页面加载微博提要。

# app/views/members/index.html.erb
<%= render 'shared/micropost_form' %>
<%= render 'shared/feed' %>

第一个错误是:

ArgumentError in MembersController#index
First argument in form cannot contain nil or be empty

返回 raise ArgumentError, "First argument in form cannot contain nil or be empty"unless object第二个错误(在删除第一个渲染语句时看到)返回 undefined method 'any?'对于 nil:NilClass

部分原因是因为要在 /members 呈现“微博提要”，app/views/members/index.html.erb 似乎需要访问app/controllers/microposts_controller.rb，我不确定如何处理。

更新:

微博 Controller .rb

# controllers/micropost_controller.rb

class MicropostsController < ApplicationController
  before_action :logged_in_user, only: [:create, :destroy]
  before_action :correct_user,   only: :destroy

  def create
    @micropost = current_user.microposts.build(micropost_params)
    if @micropost.save
      flash[:success] = "Micropost created!"
      redirect_to '/members'
    else
      @feed_items = []
      render '/members'
    end
  end

  def destroy
    @micropost.destroy
    flash[:success] = "Micropost deleted"
    redirect_to request.referrer || '/members'
  end

  private

    def micropost_params
      params.require(:micropost).permit(:content, :picture)
    end

    def correct_user
      @micropost = current_user.microposts.find_by(id: params[:id])
      redirect_to '/members' if @micropost.nil?
    end
end

_micropost_form.html.erb

# shared/_micropost_form.html.erb

<%= form_for(@micropost, html: { multipart: true }) do |f| %>
  <%= render 'shared/error_messages', object: f.object %>
  <div class="field">
    <%= f.text_area :content, placeholder: "Compose new micropost (420 chars max)..." %>
  </div>
  <%= f.submit "Post", class: "btn btn-primary" %>
  <span class="picture">
    <%= f.file_field :picture, accept: 'image/jpeg,image/gif,image/png' %>
  </span>
<% end %>

<script type="text/javascript">
  $('#micropost_picture').bind('change', function() {
    size_in_megabytes = this.files[0].size/1024/1024;
    if (size_in_megabytes > 5) {
      alert('Maximum file size is 5MB. Please choose a smaller file.');
    }
  });
</script>

_feed.html.erb

# shared/_feed.html.erb

<% if @feed_items.any? %>
  <ol class="microposts">
    <%= render @feed_items %>
  </ol>
  <%= will_paginate @feed_items %>
<% end %>

MembersController(根据下面@Mandeep 的建议更新)

class MembersController < ApplicationController
  def index
    @micropost = current_user.microposts.build
    @feed_items = current_user.microposts
  end
end

Answer 1

您没有在偏音中传递参数。您需要执行以下操作:

<%= render 'shared/micropost_form', :locals => { :micropost => @micropost }  %>
<%= render 'shared/feed', :locals => { :feed_items => @feed_items }  %>

请记住，您需要在 index 方法中包含这两个变量:@micropost 和 @feed_items。