使用 Phoenix LiveView 构建 Instagram (2)

使用PETAL(Phoenix、Elixir、TailwindCSS、AlpineJS、LiveView)技术栈构建一个简化版的Instagram Web应用程序

在第 1 部分中，我们已完成所有设置并准备好基本布局，让我们开始处理用户设置。您可以赶上Instagram 克隆 GitHub Repo。

让我们首先创建路由，打开lib/instagram_clone_web/router.ex并在范围下添加以下 2 条路由:require_authenticated_user：

  scope "/", InstagramCloneWeb do
    pipe_through [:browser, :require_authenticated_user]
 
    get "/users/settings/confirm_email/:token", UserSettingsController, :confirm_email
    live "/accounts/edit", UserLive.Settings
    live "/accounts/password/change", UserLive.PassSettings
  end

然后我们需要创建这些 liveview 文件，在该文件夹内创建一个名为user_liveunder 的文件夹lib/instagram_clone_web/live，添加以下 4 个文件：

lib/instagram_clone_web/live/user_live/settings.ex lib/instagram_clone_web/live/user_live/settings.html.leex lib/instagram_clone_web/live/user_live/pass_settings.ex lib/instagram_clone_web/live/user_live/pass_settings.html.leex

在我们的导航标题中，我们需要链接到该新路线，lib/instagram_clone_web/live/header_nav_component.html.leex在第 60 行打开，将以下内容添加到Settings live_patch to:

<%= live_patch to:  Routes.live_path(@socket, InstagramCloneWeb.UserLive.Settings)  do  %>
  <li  class="py-2 px-4 hover:bg-gray-50">Settings</li>
<%  end  %>

现在，当我们访问该链接时，我们应该会出现错误，因为文件是空的，因此打开lib/instagram_clone_web/live/user_live/settings.ex并添加以下内容：

defmodule  InstagramCloneWeb.UserLive.Settings  do
 
  use InstagramCloneWeb,  :live_view
 
  @impl true
  def  mount(_params, session, socket) do
    socket =  assign_defaults(session, socket)
 
    {:ok, socket}
  end
 
end

现在我们应该有一个空白页面，只有顶部导航栏，所以让我们开始工作吧。

我们将需要Accounts和User上下文，我们将为它们添加别名并分配变更集，我们的文件应如下所示：

defmodule  InstagramCloneWeb.UserLive.Settings  do
 
  use InstagramCloneWeb,  :live_view
 
  alias InstagramClone.Accounts
  alias InstagramClone.Accounts.User
 
  @impl true
  def  mount(_params, session, socket) do
    socket =  assign_defaults(session, socket)
    changeset = Accounts.change_user(socket.assigns.current_user)
 
    {:ok, 
      socket
      |>  assign(changeset: changeset)}
  end
 
end

我们需要将change_user()函数添加到Accounts上下文中，打开lib/instagram_clone/accounts.ex并在change_user_registration()函数下面添加以下内容：

...
 
def  change_user(user, attrs \\  %{}) do
  User.registration_changeset(user, attrs,  register_user:  false)
end
 
...

打开lib/instagram_clone_web/live/user_live/settings.html.leex并将表单添加到模板中：

<section class="border-2 flex" x-data="{username: '<%= @current_user.username %>'}">
 
  <div class="w-full py-8">
    <!-- Profile Photo -->
    <div class="flex items-center">
      <div class="w-1/3">
        <%= img_tag @current_user.avatar_url, class: "ml-auto w-10 h-10 rounded-full object-cover object-center" %>
      </div>
      <div class="w-full pl-8">
        <h1 x-text="username" class="leading-none font-semibold text-lg truncate text-gray-500"></h1>
      </div>
    </div>
    <!-- END PROFILE PHOTO -->
 
    <%= f = form_for @changeset, "#",
      phx_change: "validate",
      phx_submit: "save",
      class: "space-y-8 md:space-y-10" %>
 
      <div class="flex items-center">
        <%= label f, :full_name, class: "w-1/3 text-right font-semibold" %>
        <div class="w-full pl-8 pr-20">
          <%= text_input f, :full_name, class: "w-4/6 rounded p-1 text-semibold text-gray-600 border-gray-300 focus:ring-transparent focus:border-black", autocomplete: "off" %>
          <%= error_tag f, :full_name, class:  "text-red-700 text-sm block" %>
        </div>
      </div>
 
      <div class="flex items-center">
        <%= label f, :username, class: "w-1/3 text-right font-semibold" %>
        <div class="w-full pl-8 pr-20">
          <%= text_input f, :username, class: "w-4/6 rounded p-1 text-semibold text-gray-600 border-gray-300 focus:ring-transparent focus:border-black", x_model: "username", autocomplete: "off" %>
          <%= error_tag f, :username, class:  "text-red-700 text-sm block" %>
        </div>
      </div>
 
      <div class="flex items-center">
        <%= label f, :website, class: "w-1/3 text-right font-semibold" %>
        <div class="w-full pl-8 pr-20">
          <%= text_input f, :website, class: "w-4/6 rounded p-1 text-semibold text-gray-600 border-gray-300 focus:ring-transparent focus:border-black", autocomplete: "off" %>
          <%= error_tag f, :website, class:  "text-red-700 text-sm block" %>
        </div>
      </div>
 
      <div class="flex items-center">
        <%= label f, :bio, class: "w-1/3 text-right font-semibold" %>
        <div class="w-full pl-8 pr-20">
          <%= textarea f, :bio, class: "w-4/6 rounded p-1 text-semibold text-gray-600 border-gray-300 focus:ring-transparent focus:border-black", rows: 3, autocomplete: "off" %>
          <%= error_tag f, :bio, class:  "text-red-700 text-sm block" %>
        </div>
      </div>
 
      <div class="flex items-center">
        <%= label f, :email, class: "w-1/3 text-right font-semibold" %>
        <div class="w-full pl-8 pr-20">
          <%= email_input f, :email, class: "w-4/6 rounded p-1 text-semibold text-gray-600 border-gray-300 shadow-sm focus:ring-transparent focus:border-black", autocomplete: "off" %>
          <%= error_tag f, :email, class:  "text-red-700 text-sm block" %>
        </div>
      </div>
 
      <div class="flex items-center">
        <label class="block w-1/3 font-semibold text-right"></label>
        <div class="w-full pl-8 pr-20">
          <%= submit "Submit", phx_disable_with: "Saving...", class: "w-16 py-1 px-1 border-none shadow rounded font-semibold text-sm text-gray-50 hover:bg-light-blue-600 bg-light-blue-500 cursor-pointer" %>
        </div>
      </div>
    </form>
  </div>
</section>

我们添加了表单的基本布局，当您使用 AlpineJs 输入用户名时，用户名标题会更新。现在我们需要将validate()和save()函数添加到我们的lib/instagram_clone_web/live/user_live/settings.ex实时查看文档中，但我们首先将我们分配:page_title给我们的挂载函数：

  @impl true
  def mount(_params, session, socket) do
    socket = assign_defaults(session, socket)
    changeset = Accounts.change_user(socket.assigns.current_user)
 
    {:ok,
      socket
      |> assign(changeset: changeset)
      |> assign(page_title: "Edit Profile")} #This was added
  end

然后打开lib/instagram_clone_web/templates/layout/root.html.leex并更新页面标题后缀：

<%= live_title_tag assigns[:page_title]  ||  "InstagramClone",  suffix:  " · InstagramClone"  %>

现在让我们将处理表单的函数添加到我们的lib/instagram_clone_web/live/user_live/settings.ex：

  @impl true
  def handle_event("validate", %{"user" => user_params}, socket) do
    changeset =
      socket.assigns.current_user
      |> Accounts.change_user(user_params)
      |> Map.put(:action, :validate)
 
    {:noreply, socket |> assign(changeset: changeset)}
  end
 
  @impl true
  def handle_event("save", %{"user" => user_params}, socket) do
    case Accounts.update_user(socket.assigns.current_user, user_params) do
      {:ok, _user} ->
        {:noreply,
          socket
          |> put_flash(:info, "User updated successfully")
          |> push_redirect(to: Routes.live_path(socket, InstagramWeb.UserLive.Settings))}
 
      {:error, %Ecto.Changeset{} = changeset} ->
        {:noreply, assign(socket, :changeset, changeset)}
    end
  end

现在我们需要将update_user()函数添加到Accounts上下文中：

...
 
  def update_user(user, attrs) do
    user
    |> User.registration_changeset(attrs, register_user: false)
    |> Repo.update()
  end
 
...

我们对用户名的唯一约束不起作用，因为我们没有在迁移中添加唯一索引，所以我们现在就这样做。在我们的终端中，让我们生成一个迁移$ mix ecto.gen.migration add_users_unique_username_index，然后打开生成的迁移priv/repo/migrations/20210414220125_add_users_unique_username_index.exs并添加以下内容：

defmodule InstagramClone.Repo.Migrations.AddUsersUniqueUsernameIndex do
  use Ecto.Migration
 
  def change do
    create unique_index(:users, [:username])
  end
end

然后返回我们的终端并运行迁移$ mix ecto.migrate

现在让我们更新我们的注册变更lib/instagram_clone/accounts/user.ex集unsafe_validate_unique(:username, InstagramClone.Repo)

...
 
  def registration_changeset(user, attrs, opts \\ []) do
    user
    |> cast(attrs, [:email, :password, :username, :full_name, :avatar_url, :bio, :website])
    |> validate_required([:username, :full_name])
    |> validate_length(:username, min: 5, max: 30)
    |> validate_format(:username, ~r/^[a-zA-Z0-9_.-]*$/, message: "Please use letters and numbers without space(only characters allowed _ . -)")
    |> unique_constraint(:username)
    |> unsafe_validate_unique(:username, InstagramClone.Repo) # --> This was added
    |> validate_length(:full_name, min: 4, max: 30)
    |> validate_email()
    |> validate_password(opts)
 end
 
...

:timer.sleep(9000)另外，在测试时，我意识到我在尝试延迟实时验证时犯了一个错误，lib/instagram_clone_web/live/page_live.ex所以让我们从validate()函数中删除该行，因为它会与表单产生冲突：

  @impl true
  def handle_event("validate", %{"user" => user_params}, socket) do
    changeset =
      %User{}
      |> User.registration_changeset(user_params)
      |> Map.put(:action, :validate)
    #:timer.sleep(9000) <-- REMOVE THIS LINE
    {:noreply, socket |> assign(changeset: changeset)}
  end

完成后，我们应该能够毫无问题地编辑配置文件，所以现在让我们开始上传头像文件。

头像上传

打开lib/instagram_clone_web/live/user_live/settings.ex并允许在实时视图中上传，新的更新文件应如下所示：

defmodule InstagramCloneWeb.UserLive.Settings do
  use InstagramCloneWeb, :live_view
 
  alias InstagramClone.Accounts
  alias InstagramClone.Accounts.User
  #Files extensions accepted to be uploaded
  @extension_whitelist ~w(.jpg .jpeg .png)
 
  @impl true
  def mount(_params, session, socket) do
    socket = assign_defaults(session, socket)
    changeset = Accounts.change_user(socket.assigns.current_user)
 
    {:ok,
      socket
      |> assign(changeset: changeset)
      |> assign(page_title: "Edit Profile")
      |> allow_upload(:avatar_url,
      accept: @extension_whitelist,
      max_file_size: 9_000_000,
      progress: &handle_progress/3,#Function that will handle automatic uploads
      auto_upload: true)}
  end
 
  @impl true
  def handle_event("validate", %{"user" => user_params}, socket) do
    changeset =
      socket.assigns.current_user
      |> Accounts.change_user(user_params)
      |> Map.put(:action, :validate)
 
    {:noreply, socket |> assign(changeset: changeset)}
  end
  # Updates the socket when the upload form changes, triguers handle_progress()
  def handle_event("upload_avatar", _params, socket) do
    {:noreply, socket}
  end
 
  @impl true
  def handle_event("save", %{"user" => user_params}, socket) do
    case Accounts.update_user(socket.assigns.current_user, user_params) do
      {:ok, _user} ->
        {:noreply,
          socket
          |> put_flash(:info, "User updated successfully")
          |> push_redirect(to: Routes.live_path(socket, InstagramCloneWeb.UserLive.Settings))}
 
      {:error, %Ecto.Changeset{} = changeset} ->
        {:noreply, assign(socket, :changeset, changeset)}
    end
  end
  # This will handle the upload
  defp handle_progress(:avatar_url, entry, socket) do
 
  end
end

打开lib/instagram_clone_web/live/user_live/settings.html.leex并在用户名标题下方添加上传表单，并将该表单@uploads分配给我们的套接字：

<section class="border-2 flex" x-data="{username: '<%= @current_user.username %>'}">
 
  <div class="w-full py-8">
    <%= for {_ref, err} <- @uploads.avatar_url.errors do %>
      <p class="text-red-500 w-full text-center">
        <%= Phoenix.Naming.humanize(err) %>
      </p>
    <% end %>
    <!-- Profile Photo -->
    <div class="flex items-center">
      <div class="w-1/3">
        <%= img_tag @current_user.avatar_url, class: "ml-auto w-10 h-10 rounded-full object-cover object-center" %>
      </div>
      <div class="w-full pl-8">
        <h1 x-text="username" class="leading-none font-semibold text-lg truncate text-gray-500"></h1>
        
        <!-- THIS WAS ADDED -->
        <div  class="relative">
          <%= form_for @changeset,  "#",
            phx_change:  "upload_avatar"  %>
            <%= live_file_input @uploads.avatar_url,  class:  "cursor-pointer relative block opacity-0 z-40 -left-24"  %>
            <div  class="text-center absolute top-0 left-0 m-auto">
              <span  class="font-semibold text-sm text-light-blue-500">
                Change Profile Photo
              </span>
            </div>
          </form>
        </div>
        <!-- THIS WAS ADDED END -->
        
      </div>
    </div>
    <!-- END PROFILE PHOTO -->
 
    <%= f = form_for @changeset, "#",
      phx_change: "validate",
      phx_submit: "save",
      class: "space-y-8 md:space-y-10" %>
 
      <div class="flex items-center">
        <%= label f, :full_name, class: "w-1/3 text-right font-semibold" %>
        <div class="w-full pl-8 pr-20">
          <%= text_input f, :full_name, class: "w-4/6 rounded p-1 text-semibold text-gray-600 border-gray-300 focus:ring-transparent focus:border-black", autocomplete: "off" %>
          <%= error_tag f, :full_name, class:  "text-red-700 text-sm block" %>
        </div>
      </div>
 
      <div class="flex items-center">
        <%= label f, :username, class: "w-1/3 text-right font-semibold" %>
        <div class="w-full pl-8 pr-20">
          <%= text_input f, :username, class: "w-4/6 rounded p-1 text-semibold text-gray-600 border-gray-300 focus:ring-transparent focus:border-black", x_model: "username", autocomplete: "off" %>
          <%= error_tag f, :username, class:  "text-red-700 text-sm block" %>
        </div>
      </div>
 
      <div class="flex items-center">
        <%= label f, :website, class: "w-1/3 text-right font-semibold" %>
        <div class="w-full pl-8 pr-20">
          <%= text_input f, :website, class: "w-4/6 rounded p-1 text-semibold text-gray-600 border-gray-300 focus:ring-transparent focus:border-black", autocomplete: "off" %>
          <%= error_tag f, :website, class:  "text-red-700 text-sm block" %>
        </div>
      </div>
 
      <div class="flex items-center">
        <%= label f, :bio, class: "w-1/3 text-right font-semibold" %>
        <div class="w-full pl-8 pr-20">
          <%= textarea f, :bio, class: "w-4/6 rounded p-1 text-semibold text-gray-600 border-gray-300 focus:ring-transparent focus:border-black", rows: 3, autocomplete: "off" %>
          <%= error_tag f, :bio, class:  "text-red-700 text-sm block" %>
        </div>
      </div>
 
      <div class="flex items-center">
        <%= label f, :email, class: "w-1/3 text-right font-semibold" %>
        <div class="w-full pl-8 pr-20">
          <%= email_input f, :email, class: "w-4/6 rounded p-1 text-semibold text-gray-600 border-gray-300 shadow-sm focus:ring-transparent focus:border-black", autocomplete: "off" %>
          <%= error_tag f, :email, class:  "text-red-700 text-sm block" %>
        </div>
      </div>
 
      <div class="flex items-center">
        <label class="block w-1/3 font-semibold text-right"></label>
        <div class="w-full pl-8 pr-20">
          <%= submit "Submit", phx_disable_with: "Saving...", class: "w-16 py-1 px-1 border-none shadow rounded font-semibold text-sm text-gray-50 hover:bg-light-blue-600 bg-light-blue-500 cursor-pointer" %>
        </div>
      </div>
    </form>
  </div>
</section>

现在让我们创建一个模块来帮助我们处理头像上传。在下面lib/instagram_clone_web/live添加一个名为 的文件夹uploaders，并在该文件夹内添加一个名为 的文件avatar.ex。我们将调整头像的大小，因此让我们添加 Mogrify 依赖项来处理它，确保安装了 ImageMagick，打开mix.exs并添加到我们的项目依赖项{:mogrify, "~> 0.8.0"}，然后在我们的终端中$ mix deps.get && mix deps.compile。

现在打开lib/instagram_clone_web/live/uploaders/avatar.ex并添加以下内容：

defmodule InstagramClone.Uploaders.Avatar do
  alias InstagramCloneWeb.Router.Helpers, as: Routes
  
  # We are going to upload locally so this would be the name of the folder
  @upload_directory_name "uploads"
  @upload_directory_path "priv/static/uploads"
  
  # Returns the extensions associated with a given MIME type.
  defp ext(entry) do
    [ext | _] = MIME.extensions(entry.client_type)
    ext
  end
  
  # Returns the url path
  def get_avatar_url(socket, entry) do
    Routes.static_path(socket, "/#{@upload_directory_name}/#{entry.uuid}.#{ext(entry)}")
  end
 
  def update(socket, old_url, entry) do
    # Creates the upload directry path if not exists 
    if !File.exists?(@upload_directory_path), do: File.mkdir!(@upload_directory_path)
    
    # Consumes an individual uploaded entry
    Phoenix.LiveView.consume_uploaded_entry(socket, entry, fn %{} = meta ->
      # Destination paths for avatar thumbs
      dest = Path.join(@upload_directory_path, "#{entry.uuid}.#{ext(entry)}")
      dest_thumb = Path.join(@upload_directory_path, "thumb_#{entry.uuid}.#{ext(entry)}")
      
      # meta.path is the temporary file path
      mogrify_thumbnail(meta.path, dest, 300)
      mogrify_thumbnail(meta.path, dest_thumb, 150)
      
      # Removes Old Urls Paths
      rm_file(old_url)
      old_url |> get_thumb() |> rm_file()
    end)
 
    :ok
  end
 
  def get_thumb(avatar_url) do
    file_name = String.replace_leading(avatar_url, "/uploads/", "")
    ["/#{@upload_directory_name}", "thumb_#{file_name}"] |> Path.join()
  end
 
  def rm_file(old_avatar_url) do
    url = String.replace_leading(old_avatar_url, "/uploads/", "")
    path = [@upload_directory_path, url] |> Path.join()
 
    if File.exists?(path),  do: File.rm!(path)
  end
  
  # Resize the file with a given path, destination, and size
  defp mogrify_thumbnail(src_path, dst_path, size) do
    try do
      Mogrify.open(src_path)
      |> Mogrify.resize_to_limit("#{size}x#{size}")
      |> Mogrify.save(path: dst_path)
    rescue
      File.Error -> {:error, :invalid_src_path}
      error -> {:error, error}
    else
      _image -> {:ok, dst_path}
    end
  end
 
end

在文件顶部打开lib/instagram_clone_web/live/user_live/settings.ex新创建的模块的别名，并使用以下内容更新我们的函数：Avataralias InstagramClone.Uploaders.Avatarhandle_progress()

  defp handle_progress(:avatar_url, entry, socket) do
	# If file is already uploaded to tmp folder
    if entry.done? do
      avatar_url = Avatar.get_avatar_url(socket, entry)
      user_params = %{"avatar_url" => avatar_url}
      case Accounts.update_user(socket.assigns.current_user, user_params) do
        {:ok, _user} ->
          Avatar.update(socket, socket.assigns.current_user.avatar_url, entry)
          @doc """
            We have to update the current user and assign it back to the socket 
            to get the header nav thumbnail automatically updated
          """
          current_user = Accounts.get_user!(socket.assigns.current_user.id)
          {:noreply,
            socket
            |> put_flash(:info, "Avatar updated successfully")
            |> assign(current_user: current_user)}
        {:error, %Ecto.Changeset{} = changeset} ->
          {:noreply, assign(socket, :changeset, changeset)}
      end
    else
      {:noreply, socket}
    end
  end

最后，我们需要提供上传目录中将要创建的文件，打开lib/instagram_clone_web/endpoint.ex并更新静态插件中的第 27 行：

only:  ~w(css fonts images js favicon.ico robots.txt uploads)

现在一切都应该工作得很好，但我们正在上传缩略图，所以让我们在模板中使用它，打开lib/instagram_clone_web/live/header_nav_component.html.leex并更新第 43 行以使用我们的缩略图 URL：

<%= img_tag InstagramClone.Uploaders.Avatar.get_thumb(@current_user.avatar_url), class:  "w-full h-full object-cover object-center"  %>

同时打开lib/instagram_clone_web/live/user_live/settings.html.leex并更新第 7 行以使用我们的缩略图：

<%= img_tag Avatar.get_thumb(@current_user.avatar_url),  class:  "ml-auto w-10 h-10 rounded-full object-cover object-center"  %>

密码更改设置

现在剩下的唯一一件事就是更改密码，我们将需要一个侧面导航栏，因此让我们创建一个组件来处理它，因为它将与密码更改 LiveView 共享。在下面lib/instagram_clone_web/live/user_live添加以下2个文件：

lib/instagram_clone_web/live/user_live/settings_sidebar_component.ex lib/instagram_clone_web/live/user_live/settings_sidebar_component.html.leex

添加lib/instagram_clone_web/live/user_live/settings_sidebar_component.ex以下内容：

defmodule  InstagramCloneWeb.UserLive.SettingsSidebarComponent  do
  use InstagramCloneWeb,  :live_component
end

添加lib/instagram_clone_web/live/user_live/settings_sidebar_component.html.leex以下内容：

<div class="w-1/4 border-r-2">
  <ul>
    <%= live_patch content_tag(:li, "Edit Profile", class: "p-4 #{selected_link?(@current_uri_path,  @settings_path)}"),  to:  @settings_path %>
    <%= live_patch content_tag(:li, "Change Password", class: "p-4 #{selected_link?(@current_uri_path,  @pass_settings_path)}"),  to:  @pass_settings_path %>
  </ul>
</div>

render_helpers.ex在 下创建一个名为lib/instagram_clone_web/live. 打开lib/instagram_clone_web/live/render_helpers.ex并执行以下操作：:

defmodule  InstagramCloneWeb.RenderHelpers  do
 
  def  selected_link?(current_uri, menu_link) when current_uri == menu_link do
    "border-l-2 border-black -ml-0.5 text-gray-900 font-semibold"
  end
 
  
 
  def  selected_link?(_current_uri,  _menu_link) do
    "hover:border-l-2 -ml-0.5 hover:border-gray-300 hover:bg-gray-50"
  end
 
end

这些功能将帮助我们为侧面导航栏中的链接获取正确的样式。现在我们需要在模板中提供这些函数，打开lib/instagram_clone_web.ex视图助手函数并将其更新为以下内容：

  defp view_helpers do
    quote do
      # Use all HTML functionality (forms, tags, etc)
      use Phoenix.HTML
 
      # Import LiveView helpers (live_render, live_component, live_patch, etc)
      import Phoenix.LiveView.Helpers
 
      # Import basic rendering functionality (render, render_layout, etc)
      import Phoenix.View
 
      import InstagramCloneWeb.ErrorHelpers
      import InstagramCloneWeb.Gettext
      import InstagramCloneWeb.RenderHelpers # <-- THIS LINE WAS ADDED
      alias InstagramCloneWeb.Router.Helpers, as: Routes
    end
  end

让我们将路径分配给套接字，打开lib/instagram_clone_web/live/user_live/settings.ex并在安装中添加以下内容：

  def mount(_params, session, socket) do
    socket = assign_defaults(session, socket)
    changeset = Accounts.change_user(socket.assigns.current_user)
    # THIS WAS ADDED
    settings_path = Routes.live_path(socket, __MODULE__)
    pass_settings_path = Routes.live_path(socket, InstagramCloneWeb.UserLive.PassSettings)
 
 
    {:ok,
      socket
      |> assign(changeset: changeset)
      |> assign(page_title: "Edit Profile")
      |> assign(settings_path: settings_path, pass_settings_path: pass_settings_path)# <-- THIS WAS ADDED
      |> allow_upload(:avatar_url,
      accept: @extension_whitelist,
      max_file_size: 9_000_000,
      progress: &handle_progress/3,
      auto_upload: true)}
  end

lib/instagram_clone_web/live/user_live/settings.html.leex在标签开头下方顶部的部分标签内打开，让我们插入我们的组件：

<%= live_component @socket, InstagramCloneWeb.UserLive.SettingsSidebarComponent,  
  settings_path:  @settings_path,  
  pass_settings_path:  @pass_settings_path,  
  current_uri_path:  @current_uri_path %>

打开lib/instagram_clone_web/live/user_live/pass_settings.ex添加以下内容：

defmodule InstagramCloneWeb.UserLive.PassSettings do
  use InstagramCloneWeb, :live_view
 
  def mount(_params, session, socket) do
    socket = assign_defaults(session, socket)
    settings_path = Routes.live_path(socket, InstagramCloneWeb.UserLive.Settings)
    pass_settings_path = Routes.live_path(socket, __MODULE__)
 
    {:ok,
      socket
      |> assign(settings_path: settings_path, pass_settings_path: pass_settings_path)}
  end
end

然后打开lib/instagram_clone_web/live/user_live/pass_settings.html.leex添加以下内容：

<section class="border-2 flex">
  <%= live_component @socket, InstagramCloneWeb.UserLive.SettingsSidebarComponent,
    settings_path: @settings_path,
    pass_settings_path: @pass_settings_path,
    current_uri_path: @current_uri_path %>
</section>

让我们将表单添加到lib/instagram_clone_web/live/user_live/pass_settings.html.leex：

<section class="border-2 flex">
  <%= live_component @socket, InstagramCloneWeb.UserLive.SettingsSidebarComponent,
    settings_path: @settings_path,
    pass_settings_path: @pass_settings_path,
    current_uri_path: @current_uri_path %>
 
  <div class="w-full py-5">
    <!-- Profile Photo -->
    <div class="flex items-center">
      <div class="w-1/3">
        <%= img_tag Avatar.get_thumb(@current_user.avatar_url), class: "ml-auto w-10 h-10 rounded-full object-cover object-center" %>
      </div>
      <div class="w-full pl-8">
        <h1 class="font-semibold text-xl truncate text-gray-600"><%= @current_user.username %></h1>
      </div>
    </div>
    <!-- End Profile Photo -->
    <%= f = form_for @changeset, "#",
      phx_submit: "save",
      class: "space-y-5 md:space-y-8"  %>
 
      <div class="md:flex items-center">
        <%= label f, :old_password, "Old Password", class: "w-1/3 text-right font-semibold", for: "current_password_for_password" %>
        <div class="w-full pl-8 pr-20">
          <%= password_input f, :current_password, required: true, class: "w-4/6 rounded p-1 text-semibold text-gray-600 border-gray-300 focus:ring-transparent focus:border-black" %>
          <%= error_tag f, :current_password, class: "text-red-700 text-sm block" %>
        </div>
      </div>
 
      <div class="flex items-center">
        <%= label f, :password, "New Password", class: "w-1/3 text-right font-semibold" %>
        <div class="w-full pl-8 pr-20">
          <%= password_input f, :password, required: true, class: "w-4/6 rounded p-1 text-semibold text-gray-600 border-gray-300 focus:ring-transparent focus:border-black" %>
          <%= error_tag f, :password, class: "text-red-700 text-sm block" %>
        </div>
      </div>
 
      <div class="md:flex items-center">
        <%= label f, :password_confirmation, "Confirm New Password", class: "w-1/3 text-right font-semibold" %>
        <div class="w-full pl-8 pr-20">
          <%= password_input f, :password_confirmation, required: true, class: "w-4/6 rounded p-1 text-semibold text-gray-600 border-gray-300 focus:ring-transparent focus:border-black" %>
          <%= error_tag f, :password_confirmation, class: "text-red-700 text-sm block" %>
        </div>
      </div>
 
      <div class="flex items-center">
        <label class="w-1/3"></label>
        <div class="w-full pl-8 pr-20">
          <%= submit "Change Password", phx_disable_with: "Saving...", class: "py-1 px-2 border-none shadow rounded font-semibold text-sm text-gray-50 hover:bg-light-blue-600 bg-light-blue-500 cursor-pointer" %>
        </div>
      </div>
 
      <div class="flex items-center">
        <label class="w-1/3"></label>
        <div class="w-full pl-8 pr-20 text-right">
          <%= link "Forgot Password?", to: Routes.user_reset_password_path(@socket, :new), class: "font-semibold text-xs hover:text-light-blue-600 text-light-blue-500 cursor-pointer hover:underline" %>
        </div>
      </div>
    </form>
  </div>
</section>

最后更新lib/instagram_clone_web/live/user_live/pass_settings.ex如下：

defmodule InstagramCloneWeb.UserLive.PassSettings do
  use InstagramCloneWeb, :live_view
 
  alias InstagramClone.Accounts
  alias InstagramClone.Accounts.User
  alias InstagramClone.Uploaders.Avatar
 
  @impl true
  def mount(_params, session, socket) do
    socket = assign_defaults(session, socket)
    settings_path = Routes.live_path(socket, InstagramCloneWeb.UserLive.Settings)
    pass_settings_path = Routes.live_path(socket, __MODULE__)
    user = socket.assigns.current_user
 
    {:ok,
      socket
      |> assign(settings_path: settings_path, pass_settings_path: pass_settings_path)
      |> assign(:page_title, "Change Password")
      |> assign(changeset: Accounts.change_user_password(user))}
  end
 
  @impl true
  def handle_event("save", %{"user" => params}, socket) do
    %{"current_password" => password} = params
    case Accounts.update_user_password(socket.assigns.current_user, password, params) do
      {:ok, _user} ->
        {:noreply,
          socket
          |> put_flash(:info, "Password updated successfully.")
          |> push_redirect(to: socket.assigns.pass_settings_path)}
 
      {:error, changeset} ->
        {:noreply, assign(socket, :changeset, changeset)}
    end
  end
end

转到lib/instagram_clone/accounts.ex第 208 行，并更新update_user_password()为以下内容：

def  update_user_password(user, password, attrs) do
  user
  |> User.password_changeset(attrs)
  |> User.validate_current_password(password)
  |> Repo.update()
end

在下一部分中，我们将处理用户的个人资料。

转自：Elixirprogrammer