fix: RPCs not embedding correctly when using overloaded functions for computed relationships

src/PostgREST/Plan.hs

@@ -380,7 +380,7 @@ addRels schema action allRels parentNode (Node rPlan@ReadPlan{relName,relHint,re
             Relationship{relCardinality=M2M _} -> -- m2m does internal implicit joins that don't need aliasing
               rPlan{from=relForeignTable r, relToParent=Just r, relAggAlias=aggAlias, relJoinConds=getJoinConditions Nothing parentAlias r}
             ComputedRelationship{} ->
-              rPlan{from=relForeignTable r, relToParent=Just r{relTable=maybe (relTable r) (QualifiedIdentifier mempty) parentAlias}, relAggAlias=aggAlias, fromAlias=newAlias}
+              rPlan{from=relForeignTable r, relToParent=Just r{relTableAlias=maybe (relTable r) (QualifiedIdentifier mempty) parentAlias}, relAggAlias=aggAlias, fromAlias=newAlias}
             _ ->
               rPlan{from=relForeignTable r, relToParent=Just r, relAggAlias=aggAlias, fromAlias=newAlias, relJoinConds=getJoinConditions newAlias parentAlias r}
           ) <$> rel

src/PostgREST/Query/QueryBuilder.hs

@@ -242,8 +242,10 @@ getQualifiedIdentifier rel mainQi tblAlias = case rel of
 fromF :: Maybe Relationship -> QualifiedIdentifier -> Maybe Alias -> SQL.Snippet
 fromF rel mainQi tblAlias = "FROM " <>
   (case rel of
-    Just ComputedRelationship{relFunction,relTable} -> fromQi relFunction <> "(" <> pgFmtIdent (qiName relTable) <> ")"
-    _                                               -> fromQi mainQi) <>
+    -- Due to the use of CTEs on RPC, we need to cast the parameter to the table name in case of function overloading.
+    -- See https://github.com/PostgREST/postgrest/issues/2963#issuecomment-1736557386
+    Just ComputedRelationship{relFunction,relTableAlias,relTable} -> fromQi relFunction <> "(" <> pgFmtIdent (qiName relTableAlias) <> "::" <> fromQi relTable <> ")"
+    _                                                             -> fromQi mainQi) <>
   maybe mempty (\a -> " AS " <> pgFmtIdent a) tblAlias <>
   (case rel of
     Just Relationship{relCardinality=M2M Junction{junTable=jt}} -> ", " <> fromQi jt

src/PostgREST/SchemaCache.hs

@@ -882,6 +882,7 @@ allComputedRels =
     (QualifiedIdentifier <$> column HD.text <*> column HD.text) <*>
     (QualifiedIdentifier <$> column HD.text <*> column HD.text) <*>
     (QualifiedIdentifier <$> column HD.text <*> column HD.text) <*>
+    pure (QualifiedIdentifier mempty mempty) <*>
     column HD.bool <*>
     column HD.bool
 

src/PostgREST/SchemaCache/Relationship.hs

@@ -31,6 +31,7 @@ data Relationship = Relationship
   { relFunction     :: QualifiedIdentifier
   , relTable        :: QualifiedIdentifier
   , relForeignTable :: QualifiedIdentifier
+  , relTableAlias   :: QualifiedIdentifier
   , relToOne        :: Bool
   , relIsSelf       :: Bool
   }