使用嵌套属性动态添加rails中的字段 [英] Dynamically add fields in rails with out nested attributes

问题描述

我现在处于创建应用程序的早期阶段，我只是将一些基本代码放在适当的位置。这是当前的代码......

I am in the early stages of creating an app, and am just putting some basic code in place. Here is the current code...

<%= form_for(front_of_card_path) do |f| %>
  <%= f.fields_for :competency_templates do |builder| %>
    <%= render 'add_fields', f: builder %>
  <% end %>
  <%= link_to_add_fields "Add New Tag", f, :skill %>
<% end %>

路线

routes

 controller :cards do
    get  '/front',            action: 'front',  as: 'front_of_card'
    post '/save',             action: 'create', as: 'save_card'
    get  '/my_contact_info',  action: 'back',   as: 'back_of_card'
    put  '/save',             action: 'update', as: 'save_card'
    get  '/my_card',          action: 'show',   as: 'card'
  end

controller

controller

  def create
    @skill= Skill.new(params[:skill])
    @tag = Tag.new(params[:tag])
    @tag.save
    @skill.tag_id = @tag.id
    @skill.save
    redirect_to front_of_card_path, notice: 'Skill was successfully created.'
    #get user/session
    #save skills & tags
  end

cards.js.coffee

cards.js.coffee

jQuery ->
  $('form').on 'click', '.remove_fields', (event) ->
    $(this).prev('input[type=hidden]').val('1')
    $(this).closest('fieldset').hide()
    event.preventDefault()

  $('form').on 'click', '.add_fields', (event) ->
    time = new Date().getTime()
    regexp = new RegExp($(this).data('id'), 'g')
    $(this).before($(this).data('fields').replace(regexp, time))
    event.preventDefault()

app_helper

app_helper

module ApplicationHelper
  def link_to_add_fields(name, f, association)
    new_object = f.object.send(association).klass.new
    id = new_object.object_id
    fields = f.fields_for(association, new_object, child_index: id) do |builder|
      render(association.to_s.singularize + "_fields", f: builder)
    end
    link_to(name, '#', class: "add_fields", data: {id: id, fields: fields.gsub("\n", "")})
  end
end

所以现在这段代码给了我两个文本字段。一个用于标记名称，另一个用于标记权重，控制器在数据库中插入所有内容。我想用一些javascript来动态添加这些标签/重量字段。我发现的一切似乎都集中在嵌套属性上。任何想法都赞赏。

So right now this code gives me two text fields. One for the a tag name and another for a tag weight, and the controller inserts everything in the DB. I would like use some javascript to dynamically add as many of these tag/weight fields as I like. Everything I've found seems to focus on nested attributes. Any ideas appreciated.

添加了更多代码来充实这一点。我遇到的问题是我在这一行传递的第三个变量...

Added more code to flesh this out. The issue I am having is the 3rd variable I am passing in on this line...

  <%= link_to_add_fields "Add New Tag", f, :skill %>

它不喜欢'：技能'，但我不确定我应该在这里传递什么。

It does not like ':skill', but I am not sure what I should be passing here.

推荐答案

所以这就是我想出来的......这是我的两个模特......

So here is what I came up with...here are my two models...

class Skill < ActiveRecord::Base
  belongs_to :tag
  attr_accessible :tag_id, :weight
end

class Tag < ActiveRecord::Base
  has_many :skills
  attr_accessible :name
end

<我正在调用app / views / skills / _form.html.erb中的部分内容并使用js标记添加新字段。另请注意，我正在重新渲染部分，然后将其隐藏在最后一个div标记中。

I'm calling a partial from app/views/skills/_form.html.erb and using a js tag to add new fields. Also note that I am re-rendering the partial, then hiding it in the last div tag.

  <div id="skillSet">
    <%= render partial: "skills_form" %>

  </div>
  <a href="javascript:;" id="addNewTag">Add New Tag</a>

  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

<div class="hide" id="new_skills_form">
  <%= render partial: "skills_form", locals: {skill: false} %>
</div>

部分非常简单。我在这里所做的就是将值存储在数组中...

The partial is pretty simple. All I am doing here is storing the values in an array...

<div class="skillsForm">
  <%= label_tag 'tag' %>
  <%= text_field_tag 'tags[]' %>
  <%= label_tag 'weight' %>
  <%= text_field_tag 'weights[]' %>
</div>

...这里是javascript ...真的很直接，只需说点击#addNewTag ，appeand #new_skills_form to #skillSet

...here is the javascript...real straight forward, just say when #addNewTag is clicked, appeand #new_skills_form to #skillSet

$(document).ready(function(){
  $("#addNewTag").click(function(){
    $("#skillSet").append($("#new_skills_form").html());
  });
});

...最后控制器动作解构数组，并保存它们......

...and finally the controller action decontructs the arrays, and saves them...

def create
    @skill = Skill.new(params[:skill])
    tags = params[:tags]
    weights = params[:weights]

    tags.each_with_index do |tag, index|
      tag = Tag.create :name => tag
      Skill.create :tag_id => tag.id, :weight => weights[index]
    end
  end

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