defmodule LiveViewWeb.Orders do
def mount(_params, _session, socket) do
end
def handle_params(params, _uri, socket) do
page = params["page"]
per_page = params["per_page"]
orders = Order.list(page, per_page)
socket = socket |> assign(page: page, per_page: per_page) |> stream(:orders, orders)
end
end
So, based on the per_page and page parameters the orders list is updated.
However, in the log file I am getting this error when I click on a page button: “ArgumentError existing hook :orders already attached on :after_render”.
I’m not sure If I should go back to using temporary_assigns instead of stream api. Perhaps, I shouldn’t use streams for this kind of case
I read the other thread but I’m not sure I understood what’s the workaround for this at the moment. The docs weren’t clear to me either. Let’s say I have a route for displaying a blog post where users can:
View the blog post.
Edit the blog post using a modal.
List all comments for this blog post.
The LiveView generator gives me following code:
@impl true
def handle_params(%{"id" => id}, _, socket) do
{:noreply,
socket
|> assign(:page_title, page_title(socket.assigns.live_action))
|> assign(:post, Blog.get_post!(id))}
end
Now I want to use stream/4 to display a list of comments. I’ve updated handle_params/3 to do it:
def handle_params(%{"id" => id}, _, socket) do
{:noreply,
socket
|> assign(:page_title, page_title(socket.assigns.live_action))
|> assign(:post, Blog.get_post!(id))
|> stream(:comments, Blog.get_comments_by_post_id(id))}
end
The code above runs fine until a open the generated modal (:edit live_action) for editing the blog post. When I open it, I get that “ArgumentError existing hook :comments already attached on :after_render”.
Do I need to remove all comments using stream_delete and add them again using stream_insert?
This repo has an example of what I mean. Go to localhost:4000/posts/1 and click on the “edit” button.
