如何将插件加载的数据传递到LiveView组件 [英] How to pass plug loaded data to LiveView components

问题描述

我正在使用不同的域名来加载不同的数据集.我目前正在使用自定义插件根据主机名加载正确的域ID.例如.在路由器之前将其保存在我的 endpoint.ex 中:

Hi I'm using different domain names to load different data sets. I'm currently using a custom plug to load the correct domain id based on the hostname. E.g. got this in my endpoint.ex just before the router:

plug WebApp.DomainCheck
socket "/live", Phoenix.LiveView.Socket, websocket: [connect_info: [session: @session_options]]
...
plug WebApp.Router

还有

defmodule WebApp.DomainCheck do
  import Plug.Conn
  @behaviour Plug

  def init([]), do: []

  def call(conn, _options \\ []) do
    domains = Model.load_allowed_domains()
    case Map.get(domains, conn.host) do
      nil ->
        conn
        |> resp(401, "Domain not allowed")
        |> halt()

      domain_id ->
        conn
        |> assign(:domain_id, domain_id)
    end
  end
end

现在，这适用于普通的 View ，因为我在每个代码中都分配了 domain_id .但是，如何通过插件将 domain 数据也注入到 LiveView 中呢?

Now this works for normal View as I have the domain_id assign in each of them. But how do I get the domain data injected into my LiveViews as well from a plug?

当前，我已经将代码复制了同一域检查到每个LiveViews mount()页面:

Currently I've code duplicated the same domain check into every LiveViews mount() page:

defmodule WebApp.WelcomeLive do
  use WebApp, :live_view

  @impl true
  def mount(_args, _session, socket) do
    domains = Model.load_allowed_domains()
    host = socket.host_uri.host
    case Map.get(domains, host) do
      nil -> {:error, "Domain not allowed"}
      domain_id -> {:ok, assign(socket, :domain_id, domain_id)}
    end
  end

有什么方法可以使我的插件有效地将数据向下推送到实时视图，而无需在每个安装中添加代码?

Is there any way I can make a plug effective in pushing this data down to the live views without need to add code to each mount?

推荐答案

我的应用程序中有一个类似的用例，其中我的插件将 user 结构放在 assigns ，我想将这些数据保留在实时视图中，而无需重新加载所有内容.

I had a similar use case in my app where my plug puts the a user struct on the assigns and I wanted to keep that data inside live view without reloading all stuff.

我能实现的唯一方法是使用选项 live 路由的a> session ，并将其传递给MFA.

The only way I could achieve that was using the option session from the live route passing it a MFA.

在路由器中，您将拥有类似的东西

In the router you will have something like

live "/page", WebApp.SomeLiveView, :show, session: {WebAppp.Helpers, :keep_domain_id, []}

和您的 WebApp.Helpers 将具有该函数，该函数将要作为 session 传递给实时视图的内容返回.

and your WebApp.Helpers will have that function returning what you want to be passed to your live view as session.

defmodule WebApp.Helpers do
  def keep_domain_id(conn) do
    %{"domain_id" => conn.assigns.domain_id}
  end
end

然后在 mount 上的 session

defmodule WebApp.WelcomeLive do
  use WebApp, :live_view

  @impl true
  def mount(_args, %{"domain_id" => domain} = _session, socket) do
    ...
  end
end

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