具有嵌套属性的Best_In_Place内联编辑 [英] Best_In_Place inline edits with nested attributes

问题描述

我目前正在尝试使用best_in_place gem，以便在HTML表中进行内联编辑.我在购物车的展示视图中显示购物车.在购物车的显示视图中，我可以添加lineItems.创建LineItem时，还将使用lineItem_id创建新的Available记录，然后将其与lineitem一起显示在购物车中. Cart和LineItem表均来自外部数据库，因此，我无法向其中添加列，因此，我不能仅向LineItem添加可用的布尔属性.

I am currently trying to use the best_in_place gem in order to do inline editing within an HTML table. I am showing a cart in cart's show view. Within the cart's show view, I have the ability to add lineItems. When an LineItem is created, a new Available record is also created with a lineItem_id and then it's shown in the cart with its lineitem. Both the Cart and LineItem tables come from an external database and because of that, I can't add columns to so that is why I can't just add an available boolean attribute to the LineItem.

**cart.rb
class Cart << AR::Base
 has many LineItems
end

**line_item.rb
class LineItems <<AR::Base
 belongs_to Cart
 has_one :available 
 accepts_nested_attributes_for :available 
end

**available.rb
class Available<<AR::Base
 belongs_to LineItems
end


**views/cart/show.html.erb
@cart.lineitems.each do |line_items|
    <td><%= line_item.price %></td>
    <td><%=line_item.name %></td>
    <td><%= best_in_place line_item.available.boolean, :boolean, :path => line_items_path, :type =>  type: :checkbox, collection: %w[No Yes] %></td>  
end

我希望能够使用best_in_place在购物车显示视图上的html表中编辑line_item.available.boolean，但是我没有任何运气.任何帮助都将是惊人的！ =]我读完之后就知道不能使用嵌套属性，但是如果我能以某种方式摆脱可用的模型，并在show表中有一个字段，我可以编辑line_item来查看lineItem是否可用，那也很棒.我愿意接受任何想法！

I want to be able to edit the line_item.available.boolean within the html table which is on the cart show view using best_in_place but I am not having any luck.. Any help would be AMAZING! =] I know after reading around that it's not possible using nested attributes, but If I could get rid off the available model somehow and have a field in the show table that I can edit for a line_item to see whether or not the lineItem is available, that would also be great. I am open to any ideas!

推荐答案

首先，您的代码中有一些语法问题需要我们解决:

Firstly, there are a few syntax issues in your code that we need to fix:

@cart.lineitems.each do |line_item| # changed "line_items" to "line_item"
  <td><%= line_item.price %></td>
  <td><%=line_item.name %></td>
  <td><%= best_in_place line_item.available, :boolean, :path => line_items_path, type: :checkbox, collection: %w[No Yes] %></td>  # changed "line_item.available.boolean" to "line_item.available" and ":type =>  type: :checkbox" to "type: :checkbox"
end

现在，答案:

正如我在此Github问题中解释的那样，您需要通过一个param选项和一个url选项(以前是path，但在v3.0.0中已弃用)到best_in_place.

Now, the answer:

As I explain in this Github issue, you need to pass a param option and a url option (used to be path but that was deprecated in v3.0.0) to best_in_place.

默认url是best_in_place的第一个参数的更新操作.由于您的代码以best_in_place line_item.available开头，因此默认为url_for(line_item.available.id).但是，您希望它修补LineItemsController的更新操作，即url_for(line_item)

The default url is the update action of the first argument to best_in_place. Since your code begins with best_in_place line_item.available, this would default to url_for(line_item.available.id). However, you want it to PATCH the update action of the LineItemsController, i.e. url_for(line_item)

默认情况下，param选项假定您正在对AvailablesController进行PATCH，因此，这是Rails约定为了将available.boolean更新为值"1"所需的参数:

By default, the param option assumes you are PATCH'ing to the AvailablesController, so here are the parameters that Rails conventions require in order to update available.boolean to the value "1":

{"available"=>{"boolean"=>"1"}}

Available的ID已经在URL中，因此您唯一需要传递的额外参数是boolean的新值.

The ID of the Available is in the URL already, so the only extra param you need to pass is the new value for boolean.

但是，在您的情况下，您正在对LineItemsController进行修补，并且可用的模型接受嵌套的属性.这需要进行两项调整:

In your case, however, you are PATCH'ing to the LineItemsController and the available model accepts nested attributes. This requires two adjustments:

1. LineItem的ID已经在URL中，但Available ID则不在.我们在这里有两个选择:将Available的ID放入param选项中，或者通过在模型中将update_only: true传递给accepts_nested_attributes来使ID不必要. update_only方法可能不适用于您，具体取决于您的用例，但我发现它在大多数时候是最简单的方法，并免费提供了额外的安全层.

1. The ID of the LineItem is in the URL already, but the ID of the Available is not. We have two choices here: Either put the ID of the Available into the param option, or make the ID unnecessary by passing update_only: true to accepts_nested_attributes in the model. The update_only approach may not work for you depending on your use case, but I find that it is the simplest approach the vast majority of the time and adds an extra layer of security for free.

布尔选项需要正确嵌套，即:

The boolean option needs to be nested properly, i.e.:

line_items[available_attributes][boolean]

这样，当它到达服务器时，参数将是:

That way, when it gets to the server, the params will be:

{"line_item"=>{"available_attributes"=>{"id"=>"99","boolean"=>"1"}}}
# "99" is just an example of line_item.available.id

请注意，您将需要在控制器中允许这些属性，即:

Note that you will need to permit these attributes in the controller, i.e.:

line_item.update(params.require(:line_item).permit(
  available_attributes: [:id, :boolean]))
# You can remove `:id` if you are using the `update_only` option

将所有内容放在一起，这是您的best_in_place方法:

Putting it all together, here's your best_in_place method:

best_in_place line_item.available, :boolean, 
  type: :checkbox, 
  url: line_item_path(line_item.id),
  param: "line_item[available_attributes][id]=#{line_item.available.id}&line_item[available_attributes]"

但是，请尽可能使用update_only选项.

However, if at all possible, use the update_only option.

# line_item.rb
accepts_nested_attributes_for :available, update_only: true

看看现在变得多么简单:

Look how much simpler it becomes now:

best_in_place line_item.available, :boolean, 
  type: :checkbox, 
  url: line_item_path(line_item.id),
  # Note: `url: line_item` might also work.
  # If someone can confirm this in a comment, I can update this answer
  param: "line_item[available_attributes]"

这篇关于具有嵌套属性的Best_In_Place内联编辑的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！