Question

我试图点击服务器以返回类别的category_scores。现在，当我尝试点击服务器时，它会在控制台中给我一个错误：

 GET http://localhost:7000/categories/3/category_scores 500 (Internal Server Error)

在主页上，我通过Rails选择菜单，提供所有类别。

<div id="category-select">
  <%= collection_select(:id, :name, @categories, :id, :name, prompt: "Select category") %>
</div>

为了给你更多背景知识，下面是一个类别的模型和category_score

CATEGORY

class Category < ActiveRecord::Base
  has_many :category_scores

  validates :name, presence: true

  include PgSearch
  multisearchable against: :name


  def as_json(data)
    {
      id: id,
      gg: gg,
      name: category.name
    }
  end
end

CATEGORY SCORES

class CategoryScore < ActiveRecord::Base
  belongs_to :restaurant
  belongs_to :category
  has_many :items

  scope :health_order, -> {order("category_scores.gg DESC")}

  def as_json(data)
    {
      id: id,
      gg: gg,
      name: category.name
    }
  end
end

我在路线文件中添加了一条自定义路线：

路线

  get 'categories/:category_id/category_scores', to: 'categories#scores'

类别控制器

class CategoriesController < ApplicationController

  def scores
    category = Category.find(params[:category_id])
    render json: category.category_scores.all, status: :ok
  end

end

然后最后，这是我用来尝试命中服务器以获取JSON的JavaScript。我猜这没有什么不妥，但我在后端做的事情因为我无法显示JSON。现在当我在console.log中使用categoryID时，它看起来是正确的，所以我不确定它为什么不通过控制器进行操作。

$(document).ready(function() {
  var categorySelect = $("#category-select > select");

  categorySelect.on("change", function(event) {
    var categoryId = parseInt($("#category-select option:selected").val(), 10);
    console.log(categoryId)

    $.get("/categories/" + categoryId + "/category_scores", function(data){
      console.log(success);
      renderCategoryScores(data); // render category scores with this category ID
    })
      .fail(function(){
        console.log("error");
      })
  })
});

以下是rails控制台的错误：

Started GET "/categories/2/category_scores" for 127.0.0.1 at 2014-10-30 13:33:27 -0700
Processing by CategoriesController#scores as */*
  Parameters: {"category_id"=>"2"}
Completed 500 Internal Server Error in 3ms
** [Airbrake] Notice was not sent due to configuration:         
  Environment Monitored? false         
  API key set? false

NameError (undefined local variable or method `category' for #<CategoriesController:0x007ff1040a6778>):
  app/controllers/categories_controller.rb:4:in `scores'

Answer 1

我认为您需要定义category。

class CategoriesController < ApplicationController

  def scores
    category = Category.find(params[:category_id])
    render json: category.category_scores.all, status: :ok
  end

end

无法从Ruby on Rails Ajax调用获得JSON

1 个答案: