fix(delegate): delegate model shouldn't inherit @@index from an indirect abstract base

packages/schema/src/utils/ast-utils.ts

@@ -17,7 +17,13 @@ import {
     ModelImport,
     ReferenceExpr,
 } from '@zenstackhq/language/ast';
-import { getModelFieldsWithBases, getRecursiveBases, isDelegateModel, isFromStdlib } from '@zenstackhq/sdk';
+import {
+    getInheritanceChain,
+    getModelFieldsWithBases,
+    getRecursiveBases,
+    isDelegateModel,
+    isFromStdlib,
+} from '@zenstackhq/sdk';
 import {
     AstNode,
     copyAstNode,
@@ -61,7 +67,7 @@ export function mergeBaseModels(model: Model, linker: Linker) {
                 .concat(dataModel.fields);
 
             dataModel.attributes = bases
-                .flatMap((base) => base.attributes.filter((attr) => filterBaseAttribute(base, attr)))
+                .flatMap((base) => base.attributes.filter((attr) => filterBaseAttribute(dataModel, base, attr)))
                 .map((attr) => cloneAst(attr, dataModel, buildReference))
                 .concat(dataModel.attributes);
         }
@@ -85,7 +91,7 @@ export function mergeBaseModels(model: Model, linker: Linker) {
     linkContentToContainer(model);
 }
 
-function filterBaseAttribute(base: DataModel, attr: DataModelAttribute) {
+function filterBaseAttribute(forModel: DataModel, base: DataModel, attr: DataModelAttribute) {
     if (attr.$inheritedFrom) {
         // don't inherit from skip-level base
         return false;
@@ -101,13 +107,26 @@ function filterBaseAttribute(base: DataModel, attr: DataModelAttribute) {
         return false;
     }
 
-    if (isDelegateModel(base) && uninheritableFromDelegateAttributes.includes(attr.decl.$refText)) {
+    if (
+        // checks if the inheritance is from a delegate model or through one, if so,
+        // the attribute shouldn't be inherited as the delegate already inherits it
+        isInheritedFromOrThroughDelegate(forModel, base) &&
+        uninheritableFromDelegateAttributes.includes(attr.decl.$refText)
+    ) {
         return false;
     }
 
     return true;
 }
 
+function isInheritedFromOrThroughDelegate(model: DataModel, base: DataModel) {
+    if (isDelegateModel(base)) {
+        return true;
+    }
+    const chain = getInheritanceChain(model, base);
+    return !!chain?.some(isDelegateModel);
+}
+
 // deep clone an AST, relink references, and set its container
 function cloneAst<T extends InheritableNode>(
     node: T,

packages/sdk/src/utils.ts

@@ -569,3 +569,24 @@ export function getInheritedFromDelegate(field: DataModelField) {
     const foundBase = bases.findLast((base) => base.fields.some((f) => f.name === field.name) && isDelegateModel(base));
     return foundBase;
 }
+
+/**
+ * Gets the inheritance chain from "from" to "to", excluding them.
+ */
+export function getInheritanceChain(from: DataModel, to: DataModel): DataModel[] | undefined {
+    if (from === to) {
+        return [];
+    }
+
+    for (const base of from.superTypes) {
+        if (base.ref === to) {
+            return [];
+        }
+        const path = getInheritanceChain(base.ref!, to);
+        if (path) {
+            return [base.ref as DataModel, ...path];
+        }
+    }
+
+    return undefined;
+}

tests/regression/tests/issue-1786.test.ts

@@ -0,0 +1,48 @@
+import { loadSchema } from '@zenstackhq/testtools';
+
+describe('issue 1786', () => {
+    it('regression', async () => {
+        await loadSchema(
+            `
+    model User {
+        id       String @id @default(cuid())
+        email    String @unique @email @length(6, 32)
+        password String @password @omit
+        contents    Content[]
+
+        // everybody can signup
+        @@allow('create', true)
+
+        // full access by self
+        @@allow('all', auth() == this)
+    }
+
+    abstract model BaseContent {
+      published Boolean @default(false)
+
+      @@index([published])
+    }
+
+    model Content extends BaseContent {
+        id       String @id @default(cuid())
+        createdAt DateTime @default(now())
+        updatedAt DateTime @updatedAt
+        owner User @relation(fields: [ownerId], references: [id])
+        ownerId String
+        contentType String
+
+        @@delegate(contentType)
+    }
+
+    model Post extends Content {
+        title String
+    }
+
+    model Video extends Content {
+        name String
+        duration Int
+    }           
+        `
+        );
+    });
+});