fix: bad M2M embed on RPC

test/spec/Feature/Query/RpcSpec.hs

@@ -246,13 +246,17 @@ spec actualPgVersion =
           `shouldRespondWith`
             [json|{"id": 2, "articleStars": [{"userId": 3}]}|]
 
-      it "can embed an M2M relationship table" $
+      it "can embed an M2M relationship table" $ do
         get "/rpc/getallusers?select=name,tasks(name)&id=gt.1"
           `shouldRespondWith` [json|[
             {"name":"Michael Scott", "tasks":[{"name":"Design IOS"}, {"name":"Code IOS"}, {"name":"Design OSX"}]},
             {"name":"Dwight Schrute","tasks":[{"name":"Design w7"}, {"name":"Design IOS"}]}
           ]|]
           { matchHeaders = [matchContentTypeJson] }
+        -- https://github.com/PostgREST/postgrest/issues/2565
+        get "/rpc/get_yards?select=groups(*)"
+          `shouldRespondWith` [json|[]|]
+          { matchHeaders = [matchContentTypeJson] }
 
       it "can embed an M2M relationship table that has a parent relationship table" $
         get "/rpc/getallusers?select=name,tasks(name,project:projects(name))&id=gt.1"

test/spec/fixtures/schema.sql

@@ -2996,3 +2996,24 @@ CREATE TABLE public.tb (
 
 CREATE VIEW test.va AS SELECT a1 FROM public.ta;
 CREATE VIEW test.vb AS SELECT b1 FROM public.tb;
+
+CREATE TABLE test.groups (
+    name text PRIMARY KEY
+);
+
+CREATE TABLE test.yards (
+    id bigint PRIMARY KEY
+);
+
+CREATE TABLE test.group_yard (
+    id bigint NOT NULL,
+    group_id text NOT NULL REFERENCES test.groups(name),
+    yard_id bigint NOT NULL REFERENCES test.yards(id),
+    PRIMARY KEY (id, group_id, yard_id)
+);
+
+CREATE FUNCTION test.get_yards() RETURNS SETOF test.yards
+LANGUAGE sql
+AS $$
+  select * from test.yards;
+$$;