@project.impressionist_count - 参数数量错误（给定 2，预期 0..1）答案

【问题标题】：@project.impressionist_count - wrong number of arguments (given 2, expected 0..1)@project.impressionist_count - 参数数量错误（给定 2，预期 0..1）
【发布时间】：2016-06-01 05:47:32
【问题描述】：

我使用 Rails 5

我要统计项目的浏览量

我安装了gem 'impressionist'

生成展示次数表迁移

rails g impressionist

运行迁移

rake db:migrate

查看项目/show.html.erb

<%= @project.impressionist_count %>

第行显示错误（给定 2，预期为 0..1） 我无法确定错误的原因。

日志：

app/views/projects/show.html.erb:89:in `_app_views_projects_show_html_erb___149972252570834158_69970117978380'
  Rendering /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb within rescues/layout
  Rendering /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_source.html.erb
  Rendered /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_source.html.erb (8.9ms)
  Rendering /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb
  Rendered /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (5.1ms)
  Rendering /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb
  Rendered /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (1.7ms)
  Rendered /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb within rescues/layout (121.7ms)
DEPRECATION WARNING: #original_exception is deprecated. Use #cause instead. (called from status_code_with_paginate at /usr/local/rvm/gems/ruby-2.3.0/gems/will_paginate-3.1.0/lib/will_paginate/railtie.rb:49)

在 Rails 控制台中：

pry(main)> project.impressionist_count
ArgumentError: wrong number of arguments (given 2, expected 0..1)
from /usr/local/rvm/gems/ruby-2.3.0/gems/activerecord-5.0.0.rc1/lib/active_record/associations/collection_proxy.rb:731:in `count'

模型项目

class Project < ActiveRecord::Base
 ..........................

  is_impressionable

.............................

end

项目控制器

class ProjectsController < ApplicationController
  before_action :set_project, only: [:show, :edit, :update]
  before_action :authenticate_user!, only: [:new, :edit] 
  before_action :require_permission, only: [:edit]
  before_action :set_freelancer, only: [:show]
  before_action :set_response_current_user, only: :show, if:  :exist_response?
  after_action :verify_authorized, only: [:update]  

  impressionist :actions => [:show]

    def show
      @new_response = @project.responses.build
      impressionist(@project)
    end
...............................................
end

【问题讨论】：

标签： ruby ruby-on-rails-5 impressionist

【解决方案1】：

你的模型应该是这样的：

class Project < ActiveRecord::Base
 ..........................
  include Impressionist::IsImpressionable
  is_impressionable

 .............................

end

在控制器中：

def show
  @new_response = @project.responses.build
  # impressionist(@project) //comment out this line
 end

【讨论】：

我添加了包括 Impressionist::IsImpressionable。重新加载服务器同样的错误
从控制器显示方法中注释掉 impressionist(@project) 可能会解决问题。