fix N+1 query

Author: zcesur

lib/algora/workspace/workspace.ex

@@ -609,15 +609,14 @@ defmodule Algora.Workspace do
     end
   end
 
-  @spec list_user_contributions(String.t(), map()) :: {:ok, list(map())} | {:error, term()}
-  def list_user_contributions(github_handle, opts \\ []) do
+  @spec list_user_contributions(list(String.t()), map()) :: {:ok, list(map())} | {:error, term()}
+  def list_user_contributions(ids, opts \\ []) do
     query =
       from uc in UserContribution,
         join: u in assoc(uc, :user),
         join: r in assoc(uc, :repository),
         join: repo_owner in assoc(r, :user),
-        where: u.provider == "github",
-        where: u.provider_login == ^github_handle,
+        where: u.id in ^ids,
         where: not ilike(r.name, "%awesome%"),
         where: not ilike(r.name, "%algorithms%"),
         where: not ilike(repo_owner.provider_login, "%algorithms%"),
@@ -627,7 +626,7 @@ defmodule Algora.Workspace do
           desc: fragment("CASE WHEN ? && ?::citext[] THEN 1 ELSE 0 END", r.tech_stack, ^(opts[:tech_stack] || [])),
           desc: r.stargazers_count
         ],
-        select_merge: %{repository: %{r | user: repo_owner}}
+        select_merge: %{user: u, repository: %{r | user: repo_owner}}
 
     query =
       case opts[:limit] do

lib/algora_web/live/org/job_live.ex

@@ -1197,14 +1197,10 @@ defmodule AlgoraWeb.Org.JobLive do
 
   # Fetch contributions for all applicants and create a map for quick lookup
   defp fetch_applicants_contributions(users, tech_stack) do
-    Enum.reduce(users, %{}, fn user, acc ->
-      if user.provider_login do
-        contributions = Algora.Workspace.list_user_contributions(user.provider_login, limit: 20, tech_stack: tech_stack)
-        Map.put(acc, user.id, contributions)
-      else
-        acc
-      end
-    end)
+    users
+    |> Enum.map(& &1.id)
+    |> Algora.Workspace.list_user_contributions(tech_stack: tech_stack)
+    |> Enum.group_by(& &1.user.id)
   end
 
   # Sort applicants by their total number of contributions

lib/algora_web/live/user/profile_live.ex

@@ -14,7 +14,7 @@ defmodule AlgoraWeb.User.ProfileLive do
       {:ok, user} ->
         transactions = Payments.list_received_transactions(user.id, limit: page_size())
 
-        contributions = Algora.Workspace.list_user_contributions(user.provider_login, limit: 20)
+        contributions = Algora.Workspace.list_user_contributions([user.id], limit: 20)
 
         {:ok,
          socket