fix: Expose PKs from all tables in a view

Fixes a regression in d2719420f4.

Resolves #2458

Signed-off-by: Wolfgang Walther <walther@technowledgy.de>

CHANGELOG.md

@@ -12,6 +12,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
  - #2428, Fix opening an empty transaction on failed resource embedding - @steve-chavez
  - #2455, Fix embedding the same table multiple times - @steve-chavez
  - #2518, Fix a regression when embedding views where base tables have a different column order for FK columns - @wolfgangwalther
+ - #2458, Fix a regression with the location header when inserting into views with PKs from multiple tables - @wolfgangwalther
 
 ### Deprecated
 

src/PostgREST/SchemaCache.hs

@@ -428,8 +428,8 @@ addViewPrimaryKeys tabs keyDeps =
     else tbl) <$> tabs
   where
     findViewPKCols sch vw =
-      maybe [] (\(ViewKeyDependency _ _ _ _ pkCols) -> snd <$> pkCols) $
-      find (\(ViewKeyDependency _ viewQi _ dep _) -> dep == PKDep && viewQi == QualifiedIdentifier sch vw) keyDeps
+      concatMap (\(ViewKeyDependency _ _ _ _ pkCols) -> snd <$> pkCols) $
+      filter (\(ViewKeyDependency _ viewQi _ dep _) -> dep == PKDep && viewQi == QualifiedIdentifier sch vw) keyDeps
 
 allTables :: PgVersion -> Bool -> SQL.Statement [Schema] TablesMap
 allTables pgVer =

test/spec/Feature/Query/InsertSpec.hs

@@ -591,7 +591,7 @@ spec actualPgVersion = do
           }
 
   describe "Inserting into VIEWs" $ do
-    context "requesting no representation" $
+    context "requesting no representation" $ do
       it "succeeds with 201" $
         post "/compound_pk_view"
             [json|{"k1":1,"k2":"test","extra":2}|]
@@ -602,6 +602,17 @@ spec actualPgVersion = do
                              , matchHeaderAbsent hLocation ]
             }
 
+      it "returns a location header with pks from both tables" $
+        request methodPost "/with_multiple_pks" [("Prefer", "return=headers-only")]
+            [json|{"pk1":1,"pk2":2}|]
+          `shouldRespondWith`
+            ""
+            { matchStatus  = 201
+            , matchHeaders = [ matchHeaderAbsent hContentType
+                             , "Location" <:> "/with_multiple_pks?pk1=eq.1&pk2=eq.2"
+                             , "Content-Range" <:> "*/*" ]
+            }
+
     context "requesting header only representation" $ do
       it "returns a location header with a composite PK col" $
         request methodPost "/compound_pk_view" [("Prefer", "return=headers-only")]
@@ -614,13 +625,13 @@ spec actualPgVersion = do
                              , "Content-Range" <:> "*/*" ]
             }
 
-      it "returns location header with a single PK col" $
+      it "should not throw and return location header when a PK is null" $
         request methodPost "/test_null_pk_competitors_sponsors" [("Prefer", "return=headers-only")]
             [json|{"id":1}|]
           `shouldRespondWith`
             ""
             { matchStatus  = 201
             , matchHeaders = [ matchHeaderAbsent hContentType
-                             , "Location" <:> "/test_null_pk_competitors_sponsors?id=eq.1"
+                             , "Location" <:> "/test_null_pk_competitors_sponsors?id=eq.1&sponsor_id=is.null"
                              , "Content-Range" <:> "*/*" ]
             }

test/spec/fixtures/schema.sql

@@ -2877,3 +2877,22 @@ create table b (
 create view test.v1 as table test.a;
 
 create view test.v2 as table test.b;
+
+-- issue https://github.com/PostgREST/postgrest/issues/2458
+create table with_pk1 (pk1 int primary key);
+create table with_pk2 (pk2 int primary key);
+
+create view with_multiple_pks as
+  select * from with_pk1, with_pk2;
+
+create function with_multiple_pks_insert() returns trigger
+language plpgsql as $$
+begin
+  insert into with_pk1 values (new.pk1) on conflict do nothing;
+  insert into with_pk2 values (new.pk2) on conflict do nothing;
+  return new;
+end
+$$;
+
+create trigger ins instead of insert on with_multiple_pks
+  for each row execute procedure with_multiple_pks_insert();