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  • Ruby on rails 未定义的方法`资源类型'；对于#<；引脚：0x00007fbb13c4aa10>；你是说？还原文本

Ruby on rails 未定义的方法`资源类型'；对于#<；引脚：0x00007fbb13c4aa10>；你是说？还原文本

ruby-on-rails activerecord

Ruby on rails 未定义的方法`资源类型'；对于#<；引脚：0x00007fbb13c4aa10>；你是说？还原文本,ruby-on-rails,activerecord,Ruby On Rails,Activerecord,我正试图破坏我的rails应用程序，我被卡住了。表单显示在/pins/new，但在点击submit后，我遇到了此错误 如果需要更多文件来解决此问题，请告诉我。这是说有一个未定义的方法'resource_type'，但我没有这个名称的方法，这是我感到困惑的地方。这件事已经拖了好几天了。我在谷歌上搜索了很多，并尝试了各种各样的解决方案，但运气不佳。请帮忙。谢谢你 获取错误 “资源类型”的未定义方法，您的意思是？还原文本 Github可在以下位置找到： 最后一次提交是在添加用于创建新pin的get/p

我正试图破坏我的rails应用程序，我被卡住了。表单显示在/pins/new，但在点击submit后，我遇到了此错误

如果需要更多文件来解决此问题，请告诉我。这是说有一个未定义的方法'resource_type'，但我没有这个名称的方法，这是我感到困惑的地方。这件事已经拖了好几天了。我在谷歌上搜索了很多，并尝试了各种各样的解决方案，但运气不佳。请帮忙。谢谢你

获取错误

“资源类型”的未定义方法，您的意思是？还原文本

Github可在以下位置找到： 最后一次提交是在添加用于创建新pin的get/post路由之前

指向#CREATE方法中的pins_controller.rb第21行

class PinsController < ApplicationController

  def index
    @pins = Pin.all
  end

  def show
    @pin = Pin.find(params[:id])
  end

  def show_by_name
     @pin = Pin.find_by_slug(params[:slug])
     render :show
  end

  def new
     @pin = Pin.new
  end

  def create
    @pin = Pin.create(pin_params)
    redirect :show
  end

  private
  def pin_params
    params.require(:pin).permit(:title, :url, :slug, :text, :category_id)
  end
end
new.html.erb

<%= form_for @pin do |f| %>
    <div class="form-group">
        <label for="pin_title">Title</label>
        <%= f.text_field(:title, class: "form-control") %>
    </div>
    <div class="form-group">
        <label for="pin_url">URL</label>
        <%= f.url_field(:url, class: "form-control") %>
    </div>
    <div class="form-group">
        <label for="pin_text">Description</label>
        <%= f.text_area(:text, class: "form-control") %>
    </div>
    <div class="form-group">
        <label for="pin_category_id">Category</label>
        <%= f.collection_select(:category_id, Category.all, :id, :name, class: "form-control") %>
    </div>
    <div class="form-group">
        <%= f.submit(class: "btn btn-default")%>
    </div>
<% end %>
您有一个引用
资源类型
的验证：


class Pin < ActiveRecord::Base
  validates_presence_of :title, :url, :slug, :text, :resource_type # its right here!
  validates_uniqueness_of :slug
  belongs_to :category
end



class Pin

如果您真的想拥有它，那么您需要通过迁移将该列添加到数据库中

这不是创建资源的方式


class PinsController < ApplicationController
  # ...

  # POST /pins
  def create
    @pin = Pin.new(pin_params)
    if @pin.save
      redirect_to @pin
    else
      render :new
    end 
  end

  # ...
end



class PinsController
您能否检查pin型号或某些相关型号中是否使用了资源类型字段。此外，您可以添加管脚型号代码和错误堆栈。管脚型号中使用了资源类型字段。我添加了pin和类别模型。我还添加了create_category迁移文件。我希望通过错误堆栈，您指的是完整的跟踪。在我的create_category迁移中，我的属性category_id=resource_type。这次迁移是由我注册的班级给我的。在尝试了新给出的create方法之后，虽然它在没有错误的情况下工作，但它无法创建pin的新实例。行“@pin=pin.new”已经在“new”方法中执行。你所说的I属性category\u id=resource\u type是什么意思？您需要检查数据库中是否有该列。“行“@pin=pin.new”已在“new”方法中执行。”。这完全是错误的。当用户请求
/pins/new
时，将执行新方法。当您发布表单时，这是一个全新的请求，并且前一个请求中的变量已消失。在create_category迁移文件中，我循环遍历每个pin并为其提供一个category_id。在rails控制台中，在创建了一个包含零数据的pin后，显示了此#。post请求不应该通过请求发送表单中的数据吗？我使用Sinatra完成了这项工作，没有任何问题。您是否尝试过编写测试，使用有效和无效属性发布到
/pins
？这是创建资源的公认方法，如果你不相信我的话，它会被固定在脚手架生成器中。这里的问题可能是糟糕的方法。

class Category < ActiveRecord::Base
    has_many :pins
end



class CreateCategories < ActiveRecord::Migration[4.2]
  def change
    create_table :categories do |t|
      t.string :name
    end

    add_column :pins, :category_id, :integer, references: :categories
    add_index :pins, :category_id

    if Category.all.empty?
      Category.create(name: "ruby")
      Category.create(name: "rails")
      Category.create(name: "unknown")
    end

    unknown_category = Category.find_by_name("unknown")
    pins = Pin.where("category_id is null")

    pins.each do |pin|
      category = Category.find_by_name(pin.resource_type)
      if category.present?
        pin.category_id = category.id
      else
        pin.category_id = unknown_category.id
      end
      pin.save
    end

    if Pin.where("category_id is null").empty?
      remove_column :pins, :resource_type
      puts "MIGRATION SUCCESSFUL!"
      puts "All your data has been migrated successfully."      
    else
      puts "ERROR! Something went wrong - not all pins have been assigned a category Id."
    end
  end
end




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class Pin < ActiveRecord::Base
  validates_presence_of :title, :url, :slug, :text, :resource_type # its right here!
  validates_uniqueness_of :slug
  belongs_to :category
end



class PinsController < ApplicationController
  # ...

  # POST /pins
  def create
    @pin = Pin.new(pin_params)
    if @pin.save
      redirect_to @pin
    else
      render :new
    end 
  end

  # ...
end