名称错误：Angular/Rails 替代控制器方法问题

Question

我想在 http://localhost:3000/groups.json 之类的浏览器中访问 json 以进行投票（参见代码）。运气不太好，下面是相关代码。

错误：未定义的局部变量或方法 `group_params' for #

// inject $http so we can go to http://localhost:3000/groups.json in our browser and see an array of all the groups in our database
.factory('groups', ['$http', function($http){
    //service body
    var o = {
        groups: []
    };

    // get all the groups in the service, groups.js
    o.getAll = function() {
      return $http.get('/groups.json').success(function(data){
        angular.copy(data, o.groups);
      });
    };


    o.getAll = function() {
      return $http.get('/groups/upvote.json').success(function(data){
        angular.copy(data, o.groups);
      });
    };

Rails 控制器：

   before_action :set_group, only: [:show, :edit, :update, :destroy, :upvote]

  def upvote
    @groups = Group.all

    respond_to do |format|
      format.html {}
      format.json { render json: @groups }
    end
  end

其他方法：

  def index
   @groups = Group.all

   respond_to do |format|
     format.html {}
     format.json { render json: @groups }
   end
  end      

 def set_group
     @group = Group.where(params[:id])
  end

完全错误：

Started GET "/groups/upvote.json" for 127.0.0.1 at 2017-03-21 21:37:22       0700
Processing by GroupsController#show as JSON
Parameters: {"id"=>"upvote"}
  Group Load (0.4ms)  SELECT  "groups".* FROM "groups" WHERE     "groups"."id" = $1 LIMIT 1  [["id", 0]]
Completed 404 Not Found in 5ms (ActiveRecord: 2.4ms)

ActiveRecord::RecordNotFound (Couldn't find Group with 'id'=upvote):
  app/controllers/groups_controller.rb:131:in `set_group'

Answer 1

总结一下我们在 cmets 中的聊天：

根据堆栈跟踪，错误是由set_group 方法引发的ActiveRecord::RecordNotFound 异常引起的，这反过来导致端点返回 404，尽管在问题中为set_group 发布的代码 sn-p 没有完全匹配。

由于upvote 操作不需要设置@group，您只需从before_action 的操作列表中删除upvote。