diff --git a/packages/plugins/trpc/tests/projects/t3-trpc-v10/src/server/api/routers/generated/routers/Post.router.ts b/packages/plugins/trpc/tests/projects/t3-trpc-v10/src/server/api/routers/generated/routers/Post.router.ts
index 6827584d1..62e570e6d 100644
--- a/packages/plugins/trpc/tests/projects/t3-trpc-v10/src/server/api/routers/generated/routers/Post.router.ts
+++ b/packages/plugins/trpc/tests/projects/t3-trpc-v10/src/server/api/routers/generated/routers/Post.router.ts
@@ -23,6 +23,10 @@ export default function createRouter<Config extends BaseConfig>(
             .input($Schema.PostInputSchema.aggregate)
             .query(({ ctx, input }) => checkRead(db(ctx).post.aggregate(input as any))),
 
+        createMany: procedure
+            .input($Schema.PostInputSchema.createMany)
+            .mutation(async ({ ctx, input }) => checkMutate(db(ctx).post.createMany(input as any))),
+
         create: procedure
             .input($Schema.PostInputSchema.create)
             .mutation(async ({ ctx, input }) => checkMutate(db(ctx).post.create(input as any))),
@@ -88,6 +92,29 @@ export interface ClientType<AppRouter extends AnyRouter, Context = AppRouter['_d
             opts?: UseTRPCInfiniteQueryOptions<string, T, Prisma.GetPostAggregateType<T>, Error>,
         ) => UseTRPCInfiniteQueryResult<Prisma.GetPostAggregateType<T>, TRPCClientErrorLike<AppRouter>>;
     };
+    createMany: {
+        useMutation: <T extends Prisma.PostCreateManyArgs>(
+            opts?: UseTRPCMutationOptions<
+                Prisma.PostCreateManyArgs,
+                TRPCClientErrorLike<AppRouter>,
+                Prisma.BatchPayload,
+                Context
+            >,
+        ) => Omit<
+            UseTRPCMutationResult<
+                Prisma.BatchPayload,
+                TRPCClientErrorLike<AppRouter>,
+                Prisma.SelectSubset<T, Prisma.PostCreateManyArgs>,
+                Context
+            >,
+            'mutateAsync'
+        > & {
+            mutateAsync: <T extends Prisma.PostCreateManyArgs>(
+                variables: T,
+                opts?: UseTRPCMutationOptions<T, TRPCClientErrorLike<AppRouter>, Prisma.BatchPayload, Context>,
+            ) => Promise<Prisma.BatchPayload>;
+        };
+    };
     create: {
         useMutation: <T extends Prisma.PostCreateArgs>(
             opts?: UseTRPCMutationOptions<
diff --git a/packages/plugins/trpc/tests/projects/t3-trpc-v10/src/server/api/routers/generated/routers/User.router.ts b/packages/plugins/trpc/tests/projects/t3-trpc-v10/src/server/api/routers/generated/routers/User.router.ts
index 06ce01f31..4c686b057 100644
--- a/packages/plugins/trpc/tests/projects/t3-trpc-v10/src/server/api/routers/generated/routers/User.router.ts
+++ b/packages/plugins/trpc/tests/projects/t3-trpc-v10/src/server/api/routers/generated/routers/User.router.ts
@@ -23,6 +23,10 @@ export default function createRouter<Config extends BaseConfig>(
             .input($Schema.UserInputSchema.aggregate)
             .query(({ ctx, input }) => checkRead(db(ctx).user.aggregate(input as any))),
 
+        createMany: procedure
+            .input($Schema.UserInputSchema.createMany)
+            .mutation(async ({ ctx, input }) => checkMutate(db(ctx).user.createMany(input as any))),
+
         create: procedure
             .input($Schema.UserInputSchema.create)
             .mutation(async ({ ctx, input }) => checkMutate(db(ctx).user.create(input as any))),
@@ -88,6 +92,29 @@ export interface ClientType<AppRouter extends AnyRouter, Context = AppRouter['_d
             opts?: UseTRPCInfiniteQueryOptions<string, T, Prisma.GetUserAggregateType<T>, Error>,
         ) => UseTRPCInfiniteQueryResult<Prisma.GetUserAggregateType<T>, TRPCClientErrorLike<AppRouter>>;
     };
+    createMany: {
+        useMutation: <T extends Prisma.UserCreateManyArgs>(
+            opts?: UseTRPCMutationOptions<
+                Prisma.UserCreateManyArgs,
+                TRPCClientErrorLike<AppRouter>,
+                Prisma.BatchPayload,
+                Context
+            >,
+        ) => Omit<
+            UseTRPCMutationResult<
+                Prisma.BatchPayload,
+                TRPCClientErrorLike<AppRouter>,
+                Prisma.SelectSubset<T, Prisma.UserCreateManyArgs>,
+                Context
+            >,
+            'mutateAsync'
+        > & {
+            mutateAsync: <T extends Prisma.UserCreateManyArgs>(
+                variables: T,
+                opts?: UseTRPCMutationOptions<T, TRPCClientErrorLike<AppRouter>, Prisma.BatchPayload, Context>,
+            ) => Promise<Prisma.BatchPayload>;
+        };
+    };
     create: {
         useMutation: <T extends Prisma.UserCreateArgs>(
             opts?: UseTRPCMutationOptions<
diff --git a/packages/runtime/src/enhancements/policy/handler.ts b/packages/runtime/src/enhancements/policy/handler.ts
index ef48f7f38..6b7e67bea 100644
--- a/packages/runtime/src/enhancements/policy/handler.ts
+++ b/packages/runtime/src/enhancements/policy/handler.ts
@@ -690,16 +690,25 @@ export class PolicyProxyHandler<DbClient extends DbClientContract> implements Pr
         const postWriteChecks: PostWriteCheckRecord[] = [];
 
         // registers a post-update check task
-        const _registerPostUpdateCheck = async (model: string, uniqueFilter: any) => {
+        const _registerPostUpdateCheck = async (
+            model: string,
+            preUpdateLookupFilter: any,
+            postUpdateLookupFilter: any
+        ) => {
             // both "post-update" rules and Zod schemas require a post-update check
             if (this.utils.hasAuthGuard(model, 'postUpdate') || this.utils.getZodSchema(model)) {
                 // select pre-update field values
                 let preValue: any;
                 const preValueSelect = this.utils.getPreValueSelect(model);
                 if (preValueSelect && Object.keys(preValueSelect).length > 0) {
-                    preValue = await db[model].findFirst({ where: uniqueFilter, select: preValueSelect });
+                    preValue = await db[model].findFirst({ where: preUpdateLookupFilter, select: preValueSelect });
                 }
-                postWriteChecks.push({ model, operation: 'postUpdate', uniqueFilter, preValue });
+                postWriteChecks.push({
+                    model,
+                    operation: 'postUpdate',
+                    uniqueFilter: postUpdateLookupFilter,
+                    preValue,
+                });
             }
         };
 
@@ -826,7 +835,7 @@ export class PolicyProxyHandler<DbClient extends DbClientContract> implements Pr
                     await this.utils.checkPolicyForUnique(model, args, 'update', db, checkArgs);
 
                     // register post-update check
-                    await _registerPostUpdateCheck(model, args);
+                    await _registerPostUpdateCheck(model, args, args);
                 }
             }
         };
@@ -873,7 +882,7 @@ export class PolicyProxyHandler<DbClient extends DbClientContract> implements Pr
                     await this.utils.checkPolicyForUnique(model, uniqueFilter, 'update', db, args);
 
                     // handles the case where id fields are updated
-                    const ids = this.utils.clone(existing);
+                    const postUpdateIds = this.utils.clone(existing);
                     for (const key of Object.keys(existing)) {
                         const updateValue = (args as any).data ? (args as any).data[key] : (args as any)[key];
                         if (
@@ -881,12 +890,12 @@ export class PolicyProxyHandler<DbClient extends DbClientContract> implements Pr
                             typeof updateValue === 'number' ||
                             typeof updateValue === 'bigint'
                         ) {
-                            ids[key] = updateValue;
+                            postUpdateIds[key] = updateValue;
                         }
                     }
 
                     // register post-update check
-                    await _registerPostUpdateCheck(model, ids);
+                    await _registerPostUpdateCheck(model, existing, postUpdateIds);
                 }
             },
 
@@ -978,7 +987,7 @@ export class PolicyProxyHandler<DbClient extends DbClientContract> implements Pr
                     await this.utils.checkPolicyForUnique(model, uniqueFilter, 'update', db, args);
 
                     // register post-update check
-                    await _registerPostUpdateCheck(model, uniqueFilter);
+                    await _registerPostUpdateCheck(model, uniqueFilter, uniqueFilter);
 
                     // convert upsert to update
                     const convertedUpdate = {
diff --git a/packages/schema/src/plugins/access-policy/expression-writer.ts b/packages/schema/src/plugins/access-policy/expression-writer.ts
index 2ab3e2bdd..a5de026f0 100644
--- a/packages/schema/src/plugins/access-policy/expression-writer.ts
+++ b/packages/schema/src/plugins/access-policy/expression-writer.ts
@@ -70,6 +70,8 @@ export class ExpressionWriter {
         this.plainExprBuilder = new TypeScriptExpressionTransformer({
             context: ExpressionContext.AccessPolicy,
             isPostGuard: this.isPostGuard,
+            // in post-guard context, `this` references pre-update value
+            thisExprContext: this.isPostGuard ? 'context.preValue' : undefined,
         });
     }
 
diff --git a/packages/schema/src/plugins/access-policy/policy-guard-generator.ts b/packages/schema/src/plugins/access-policy/policy-guard-generator.ts
index 2025c3d5c..20893da10 100644
--- a/packages/schema/src/plugins/access-policy/policy-guard-generator.ts
+++ b/packages/schema/src/plugins/access-policy/policy-guard-generator.ts
@@ -6,7 +6,6 @@ import {
     Enum,
     Expression,
     Model,
-    isBinaryExpr,
     isDataModel,
     isDataModelField,
     isEnum,
@@ -15,7 +14,6 @@ import {
     isMemberAccessExpr,
     isReferenceExpr,
     isThisExpr,
-    isUnaryExpr,
 } from '@zenstackhq/language/ast';
 import {
     FIELD_LEVEL_OVERRIDE_READ_GUARD_PREFIX,
@@ -281,30 +279,6 @@ export default class PolicyGenerator {
         }
     }
 
-    private visitPolicyExpression(expr: Expression, postUpdate: boolean): Expression | undefined {
-        if (isBinaryExpr(expr) && (expr.operator === '&&' || expr.operator === '||')) {
-            const left = this.visitPolicyExpression(expr.left, postUpdate);
-            const right = this.visitPolicyExpression(expr.right, postUpdate);
-            if (!left) return right;
-            if (!right) return left;
-            return { ...expr, left, right };
-        }
-
-        if (isUnaryExpr(expr) && expr.operator === '!') {
-            const operand = this.visitPolicyExpression(expr.operand, postUpdate);
-            if (!operand) return undefined;
-            return { ...expr, operand };
-        }
-
-        if (postUpdate && !this.hasFutureReference(expr)) {
-            return undefined;
-        } else if (!postUpdate && this.hasFutureReference(expr)) {
-            return undefined;
-        }
-
-        return expr;
-    }
-
     private hasFutureReference(expr: Expression) {
         for (const node of streamAst(expr)) {
             if (isInvocationExpr(node) && node.function.ref?.name === 'future' && isFromStdlib(node.function.ref)) {
@@ -599,13 +573,19 @@ export default class PolicyGenerator {
         // visit a reference or member access expression to build a
         // selection path
         const visit = (node: Expression): string[] | undefined => {
+            if (isThisExpr(node)) {
+                return [];
+            }
+
             if (isReferenceExpr(node)) {
                 const target = resolved(node.target);
                 if (isDataModelField(target)) {
                     // a field selection, it's a terminal
                     return [target.name];
                 }
-            } else if (isMemberAccessExpr(node)) {
+            }
+
+            if (isMemberAccessExpr(node)) {
                 if (forAuthContext && isAuthInvocation(node.operand)) {
                     return [node.member.$refText];
                 }
@@ -621,6 +601,7 @@ export default class PolicyGenerator {
                     return [...inner, node.member.$refText];
                 }
             }
+
             return undefined;
         };
 
diff --git a/packages/schema/src/utils/typescript-expression-transformer.ts b/packages/schema/src/utils/typescript-expression-transformer.ts
index ec4f89fcb..27e018aa1 100644
--- a/packages/schema/src/utils/typescript-expression-transformer.ts
+++ b/packages/schema/src/utils/typescript-expression-transformer.ts
@@ -112,9 +112,7 @@ export class TypeScriptExpressionTransformer {
             throw new TypeScriptExpressionTransformerError(`Unresolved MemberAccessExpr`);
         }
 
-        if (isThisExpr(expr.operand)) {
-            return expr.member.ref.name;
-        } else if (isFutureExpr(expr.operand)) {
+        if (isFutureExpr(expr.operand)) {
             if (this.options?.isPostGuard !== true) {
                 throw new TypeScriptExpressionTransformerError(`future() is only supported in postUpdate rules`);
             }
diff --git a/tests/integration/tests/regression/issue-1235.test.ts b/tests/integration/tests/regression/issue-1235.test.ts
new file mode 100644
index 000000000..1e9f80f86
--- /dev/null
+++ b/tests/integration/tests/regression/issue-1235.test.ts
@@ -0,0 +1,35 @@
+import { loadSchema } from '@zenstackhq/testtools';
+
+describe('issue 1235', () => {
+    it('regression1', async () => {
+        const { enhance } = await loadSchema(
+            `
+            model Post {
+                id Int @id @default(autoincrement())
+                @@deny("update", future().id != id)
+                @@allow("all", true)
+            }
+            `
+        );
+
+        const db = enhance();
+        const post = await db.post.create({ data: {} });
+        await expect(db.post.update({ data: { id: post.id + 1 }, where: { id: post.id } })).toBeRejectedByPolicy();
+    });
+
+    it('regression2', async () => {
+        const { enhance } = await loadSchema(
+            `
+            model Post {
+                id Int @id @default(autoincrement())
+                @@deny("update", future().id != this.id)
+                @@allow("all", true)
+            }
+            `
+        );
+
+        const db = enhance();
+        const post = await db.post.create({ data: {} });
+        await expect(db.post.update({ data: { id: post.id + 1 }, where: { id: post.id } })).toBeRejectedByPolicy();
+    });
+});