From 33bd0a7061c91f9e36d54158164dff064a542dde Mon Sep 17 00:00:00 2001
From: Zach Daniel <zach@zachdaniel.dev>
Date: Fri, 17 Nov 2023 07:46:43 -0500
Subject: [PATCH] fix: properly add filters for exists aggregates

closes: #173
---
 lib/aggregate.ex | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/aggregate.ex b/lib/aggregate.ex
index d090a56..2d86592 100644
--- a/lib/aggregate.ex
+++ b/lib/aggregate.ex
@@ -94,10 +94,17 @@ defmodule AshPostgres.Aggregate do
                 is_single? && Enum.at(aggregates, 0).kind == :exists ->
                   [aggregate] = aggregates
 
+                  expr =
+                    if is_nil(Map.get(aggregate.query, :filter)) do
+                      true
+                    else
+                      Map.get(aggregate.query, :filter)
+                    end
+
                   exists =
                     AshPostgres.Expr.dynamic_expr(
                       query,
-                      %Ash.Query.Exists{path: aggregate.relationship_path, expr: true},
+                      %Ash.Query.Exists{path: aggregate.relationship_path, expr: expr},
                       query.__ash_bindings__
                     )