fix: relations v5 patch query selection

graphile/graphile-settings/src/plugins/meta-schema/relation-meta-builders.ts

@@ -43,12 +43,14 @@ export function buildBelongsToRelations(
       sameAttributes(unique.attributes, localAttributes),
     );
 
+    const remoteCodec = relation.remoteResource?.codec;
+
     belongsTo.push({
       fieldName: relationName,
       isUnique,
-      type: relation.remoteResource?.codec?.name || null,
+      type: remoteCodec?.name || null,
       keys: buildFieldList(localAttributes, codec, attributes, context),
-      references: { name: relation.remoteResource?.codec?.name || 'unknown' },
+      references: { name: remoteCodec?.name || 'unknown' },
     });
   }
 
@@ -73,12 +75,14 @@ export function buildReverseRelations(
       sameAttributes(unique.attributes, remoteAttributes),
     );
 
+    const remoteCodec = relation.remoteResource?.codec;
+
     const meta: HasRelation = {
       fieldName: relationName,
       isUnique,
-      type: relation.remoteResource?.codec?.name || null,
+      type: remoteCodec?.name || null,
       keys: buildFieldList(relation.localAttributes || [], codec, attributes, context),
-      referencedBy: { name: relation.remoteResource?.codec?.name || 'unknown' },
+      referencedBy: { name: remoteCodec?.name || 'unknown' },
     };
 
     if (isUnique) {

graphql/query/src/generators/field-selector.ts

@@ -293,11 +293,23 @@ function getRelatedTableScalarFields(
     return {};
   }
 
-  // Find the related table in allTables
-  const relatedTable = allTables.find((t) => t.name === referencedTableName);
+  // Find the related table in allTables.
+  // PostGraphile v5 uses different inflections in different contexts:
+  // - table.name: PascalCase tableType (e.g., "Shipment", "DriverVehicleAssignment")
+  // - relation referencedBy.name: raw codec name (e.g., "shipments", "driverVehicleAssignments")
+  // Try exact match first, then case-insensitive match with optional trailing 's' for plural.
+  const nameLower = referencedTableName.toLowerCase().replace(/_/g, '');
+  const nameBase = nameLower.endsWith('s') ? nameLower.slice(0, -1) : nameLower;
+  const relatedTable =
+    allTables.find((t) => t.name === referencedTableName) ??
+    allTables.find((t) => {
+      const tLower = t.name.toLowerCase().replace(/_/g, '');
+      return tLower === nameLower || tLower === nameBase;
+    });
   if (!relatedTable) {
-    // Related table not found in schema - return empty selection
-    return {};
+    // Related table not found in schema — return fallback { __typename: true }
+    // so the query remains valid (nodes need at least one subfield).
+    return { __typename: true };
   }
 
   // Get ALL scalar fields from the related table (non-relational fields)

graphql/query/src/generators/select.ts

@@ -788,7 +788,18 @@ function findRelatedTable(
   }
 
   // Find the related table in allTables
-  return allTables.find((tbl) => tbl.name === referencedTableName) || null;
+  const exactMatch = allTables.find((tbl) => tbl.name === referencedTableName);
+  if (exactMatch) return exactMatch;
+
+  // Fuzzy match: case-insensitive, strip underscores, optional trailing 's'.
+  // Needed because relation target names from _meta use snake_case codec names
+  // (e.g. "routes", "delivery_zone") while allTables[].name is PascalCase (e.g. "Route", "DeliveryZone").
+  const nameLower = referencedTableName.toLowerCase().replace(/_/g, '');
+  const nameBase = nameLower.endsWith('s') ? nameLower.slice(0, -1) : nameLower;
+  return allTables.find((tbl) => {
+    const tLower = tbl.name.toLowerCase().replace(/_/g, '');
+    return tLower === nameLower || tLower === nameBase;
+  }) || null;
 }
 
 /**