从Rails中的成员变量通过表单减少/增加。

huangapple
go评论102阅读模式
英文:

Decrease/Increase from member variable in rails via form

问题

I have two classes A and B.
B belongs to A, and A has many Bs with resources configured as:

  1.   resources :as do
  2.     resources :bs
  3.   end

B has a member variable amount which I want to be able to decrease and increase from the front end using a form, in this case, it cannot be the edit form.

Can I do this at all? and can I do where the form opens in a pop-up on following a link to?

The function I imagine for increase is something like this:

  1. def increase()
  2.    @b = b.find(params[:id])
  3.    @b.amount = @b.amount + params[:amount]
  4.    @.update
  5. end

I Just cannot wrap my head around how to do it.

英文:

I have two classes A and B
B belongs to A and A has many Bs with resources configured as:

  1.   resources :as do
  2.     resources :bs
  3.   end

B has a member variable amount which I want to be able to decrease and increase from the front end using a form, in this case, it cannot be the edit form.

Can I do this at all? and can I do where the form opens in a pop up on following a link to?

The function I imagine for increase is something like this:

  1. def increase()
  2.    @b = b.find(params[:id])
  3.    @b.amount = @b.amount + params[:amount]
  4.    @.update
  5. end

I Just cannot wrap my head around how to do it.

答案1

得分: 1

你可以创建一个自定义路由。在Rails指南中有许多非资源路由供您参考。

一种方法是使用以下方式：

  • 使用 put，因为这是一个更新请求
  • 使用 on: :member 来捕获路由上的 params[:id] 参数
  1. # routes.rb
  3. resources :as do
  4.   resources :bs do
  5.     put 'increase_amount', on: :member
  6.     put 'decrease_amount', on: :member
  7.   end
  8. end
  1. # bs controller
  3. def increase_amount()
  4.    @b = B.find(params[:id])
  5.    amount = @b.amount + params[:amount]
  6.    if @b.update(amount: amount)
  7.      ...
  8.    else
  9.      ...
  10.    end
  11. end
  13. def decrease_amount()
  14.    @b = B.find(params[:id])
  15.    amount = @b.amount - params[:amount]
  16.    if @b.update(amount: amount)
  17.      ...
  18.    else
  19.      ...
  20.    end
  21. end
  1. # 尚未验证这是否是正确的路由名称，请使用 rake routes 进行确认
  2. <%= form_tag(increase_amount_a_bs_path(@a, @b), method: :put) do %>
  3.   <%= label_tag(:amount, "Increase Amount:") %>
  4.   <%= number_field_tag(:amount) %>
  5.   <%= submit_tag("Update Amount") %>
  6. <% end %>
  8. <%= form_tag(decrease_amount_a_bs_path(@a, @b), method: :put) do %>
  9.   <%= label_tag(:amount, "Decrease Amount:") %>
  10.   <%= number_field_tag(:amount) %>
  11.   <%= submit_tag("Update Amount") %>
  12. <% end %>

至于弹出窗口，我不确定您的技术堆栈中使用的前端库，但是Bootstrap是一个选项，modal。

英文:

You can create a custom route. Many diff non-resourceful routes in the Rails Guides to check out.

One way is with the following:

  • using put because this is an update request
  • using on: :member to capture the bs params[:id] on the route
  1. # routes.rb
  3. resources :as do
  4.   resources :bs do
  5.     put &#39;increase_amount&#39;, on: :member
  6.     put &#39;decrease_amount&#39;, on: :member
  7.   end
  8. end
  1. # bs controller
  3. def increase_amount()
  4.    @b = B.find(params[:id])
  5.    amount = @b.amount + params[:amount]
  6.    if @b.update(amount: amount)
  7.      ...
  8.    else
  9.      ...
  10.    end
  11. end
  13. def decrease_amount()
  14.    @b = B.find(params[:id])
  15.    amount = @b.amount - params[:amount]
  16.    if @b.update(amount: amount)
  17.      ...
  18.    else
  19.      ...
  20.    end
  21. end
  1. # haven&#39;t verified this is the correct route name, confirm using rake routes
  2. &lt;%= form_tag(increase_amount_a_bs_path(@a, @b), method: :put) do %&gt;
  3.   &lt;%= label_tag(:amount, &quot;Increase Amount:&quot;) %&gt;
  4.   &lt;%= number_field_tag(:amount) %&gt;
  5.   &lt;%= submit_tag(&quot;Update Amount&quot;) %&gt;
  6. &lt;% end %&gt;
  8. &lt;%= form_tag(decrease_amount_a_bs_path(@a, @b), method: :put) do %&gt;
  9.   &lt;%= label_tag(:amount, &quot;Decrease Amount:&quot;) %&gt;
  10.   &lt;%= number_field_tag(:amount) %&gt;
  11.   &lt;%= submit_tag(&quot;Update Amount&quot;) %&gt;
  12. &lt;% end %&gt;

As for the popup, I'm not sure what frontend library in your tech stack but Bootstrap comes to mind as an option, modal

huangapple
  • 本文由 发表于 2023年5月7日 02:26:07
  • 转载请务必保留本文链接：https://go.coder-hub.com/76190476.html
  • ruby-on-rails
匿名

发表评论

匿名网友

:?: :razz: :sad: :evil: :!: :smile: :oops: :grin: :eek: :shock: :???: :cool: :lol: :mad: :twisted: :roll: :wink: :idea: :arrow: :neutral: :cry: :mrgreen:

确定