hackersleepyhead

hackersleepyhead

I am trying to build a normal CRUD application using Phoenix.LiveView, Here I am facing an issue in passing or setting a Value is ASSIGN or IN SOCKET.

I have a LiveView code

Index.ex

defmodule Example.Index do
	use Phoenix.LiveView

	@default_state %{
		is_editing?: false,
		user_id: nil,
	}

	def render(assign) do
		ExampleWeb.render("index.html", assign)
	end

	def mount(_params, _session, socket) do
		users = Example.get_users()
		{:ok, assign(socket, %{@default_state | users: users})}
	end

	def handle_event("edit-user", %{"user-id" => user_id}, socket) do
		new_socket =
			socket
			|> assign(:user_id, user_id)

		{:noreply,
			live_redirect(new_socket,
			to: ExampleWeb.Router.Helpers.users_edit_path(new_socket, __MODULE__, user_id),
			replace: false
		)}
	end
end

Template file

<div class="card">
  <%= if @is_editing? do %>
    <%= live_component(@socket, ExampleWeb.Users.EditFormComponent, id: :edit_user) %>
  <%= end %>
  <%= if @is_editing? != true do %>
    <div class="card-header">
      <strong>Users</strong>
      <a class="btn btn-sm btn-success ml-3 pull-right" phx-click="new">
        <i class="fa fa-plus mr-1"></i> Create
      </a>
    </div>
   <%= end %>
</div

here is my component.ex code

defmodule ExampleWeb.Users.EditFormComponent do
	use Phoenix.LiveComponent

	def render(assigns) do
		UserView.render("update.html", assigns)
	end
	
	def mount(socket) do
		{:ok, assign(socket, changeset: User.changeset(%User{}))}
	end
end

the problem is here I am not able to get the user-id which is set/update in LiveView file and also not able to access the PARAMS component level.

Can somebody suggest or provide a solution for this??

Showing Posts 1 to 5

sfusato

sfusato

You’re not passing the user_id to your component:

    <%= live_component(@socket, ExampleWeb.Users.EditFormComponent, id: :edit_user) %>
hackersleepyhead

hackersleepyhead OP

actually, the problem was with the page Refresh, it was keep updating the assigns to default.

benwilson512

benwilson512

Author of Craft GraphQL APIs in Elixir with Absinthe

You also may need to make use of update Phoenix.LiveComponent — Phoenix LiveView v1.2.5 to actually assign the passed in value to the live component.

What do you mean?

hackersleepyhead

hackersleepyhead OP

I have tried, using update and preload as well, but still, the value inside the assigns is nil, this happens after the page refresh.

What I am trying to achieve is:

LiveView -
list of users
EditUserComponent - I set the user-id in assigns
When the view changes - to edit user for the first time I get user-id this is fine, but when I refresh the page on this componentView the user-id becomes nil.

I want the user-id in LiveComponent always - bcoz based on the user-id I fetch the user details to pre-populate values.

I think this issue occurs bcoz of URL change -
USER list - /users
EDIT. - /users/1/edit

this might be the problem, I don’t know how to handle this.

benwilson512

benwilson512

Author of Craft GraphQL APIs in Elixir with Absinthe

can you show more complete code for both views and the component?

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