Created
September 24, 2020 02:36
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defmodule AppWeb.PageLive do | |
use AppWeb, :live_view | |
alias App.Posts | |
alias App.Posts.Post | |
alias App.Votes | |
@impl true | |
def mount(_params, session, socket) do | |
socket = maybe_assign_user(session, socket) | |
days = 5 | |
votes = get_votes(socket) | |
if connected?(socket) do | |
AppWeb.Endpoint.subscribe("post") | |
end | |
{:ok, | |
assign(socket, %{ | |
days: get_days(days), | |
votes: votes | |
})} | |
end | |
@impl true | |
def handle_info( | |
%{topic: "post", event: "upvoted", payload: %{post_id: post_id, day: day, month: month}}, | |
socket | |
) do | |
post = find_post_in_socket(post_id, day, month, socket) | |
post = %Post{post | upvotes: post.upvotes + 1} | |
{:noreply, | |
assign(socket, %{ | |
days: upvote_post_in_days(post, day, month, socket.assigns.days) | |
})} | |
end | |
@impl true | |
def handle_event("upvote", %{"id" => post_id, "day" => day, "month" => month}, socket) do | |
socket = | |
if(socket.assigns[:current_user]) do | |
day = String.to_integer(day) | |
month = String.to_integer(month) | |
post_id = String.to_integer(post_id) | |
post = find_post_in_socket(post_id, day, month, socket) | |
{:ok, post} = | |
Posts.update_post(post, %{ | |
upvotes: post.upvotes + 1 | |
}) | |
{:ok, vote} = | |
Votes.create_vote(%{ | |
user_id: socket.assigns.current_user.id, | |
post_id: post_id | |
}) | |
AppWeb.Endpoint.broadcast("post", "upvoted", %{ | |
day: day, | |
month: month, | |
post_id: post.id | |
}) | |
assign(socket, %{ | |
votes: socket.assigns.votes ++ [vote] | |
}) | |
else | |
socket | |
end | |
{:noreply, socket} | |
end | |
defp get_votes(socket) do | |
if socket.assigns[:current_user] do | |
App.Repo.preload(socket.assigns.current_user, :votes).votes | |
else | |
[] | |
end | |
end | |
defp get_days(count) do | |
now = Timex.beginning_of_day(Timex.now()) | |
Enum.map(0..(count - 1), fn i -> | |
date = Timex.shift(now, days: -i) | |
%{ | |
date: date, | |
day: date.day, | |
month: date.month, | |
posts: Posts.most_popular_for_date(date) | |
} | |
end) | |
end | |
defp find_post_in_socket(post_id, day, month, socket) do | |
get_in(socket.assigns.days, [ | |
Access.filter(&(&1.day == day && &1.month == month)), | |
:posts, | |
Access.filter(&(&1.id == post_id)) | |
]) | |
|> List.flatten() | |
|> List.first() | |
end | |
defp upvote_post_in_days(post, day, month, days) do | |
put_in( | |
days, | |
[ | |
Access.filter(&(&1.day == day && &1.month == month)), | |
:posts, | |
Access.filter(&(&1.id == post.id)), | |
Access.key!(:upvotes) | |
], | |
post.upvotes | |
) | |
end | |
end |
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