ruby-on-rails - # 的 MembersController#index 未定义方法 `total_pages' 中的 NoMethodError

Question

错误输出为:

NoMethodError in MembersController#index
undefined method `total_pages' for  #<Micropost::ActiveRecord_Associations_CollectionProxy:0x007ffc26104288>

应用程序跟踪是:

app/views/shared/_feed.html.erb:5:in `_app_views_shared__feed_html_erb__933429040368905157_70360748756160'
app/views/members/index.html.erb:4:in `_app_views_members_index_html_erb__2919315027143638402_70360970104820'

更新:

源接近错误:

        arel.public_send(method, *args, &block)
      else
        super # marked red
      end
    end
  end

附加信息:

app/views/members/index.html.erb 使用另一个 Controller microposts_controller 呈现两个部分。因此，我将展示两个 Controller 和两个部分的内容。

# app/views/members/index.html.erb
<%= render 'shared/micropost_form', :locals => { :micropost => @micropost }  %>
<%= render 'shared/feed', :locals => { :feed_items => @feed_items } %>

成员 Controller

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

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 %>

Answer 1

您想在 View 中使用 will_paginate 对记录进行分页，但您没有在 Controller 中对它们进行分页:

def index
  @micropost = current_user.microposts.build
  @feed_items = current_user.feed.paginate(page: params[:page])
end