diff --git a/src/Category/category.schema.ts b/src/Category/category.schema.ts
index d65225e..eb3c5ae 100644
--- a/src/Category/category.schema.ts
+++ b/src/Category/category.schema.ts
@@ -55,5 +55,38 @@ export class CategorySchema extends PothosSchema {
         },
       }),
     }));
+
+    // mutation
+    this.builder.mutationFields((t) => ({
+      createCategory: t.prismaField({
+        type: this.category(),
+        args: {
+          input: t.arg({
+            type: this.builder.generator.getCreateInput('Category'),
+            required: true,
+          }),
+        },
+        resolve: async (query, root, args, ctx, info) => {
+          return await this.prisma.category.create({
+            data: args.input,
+          });
+        },
+      }),
+      createManyCategories: t.prismaField({
+        type: [this.category()],
+        args: {
+          data: t.arg({
+            type: [this.builder.generator.getCreateManyInput('Category')],
+            required: true,
+          }),
+        },
+        resolve: async (query, root, args, ctx, info) => {
+          return await this.prisma.category.createManyAndReturn({
+            data: args.data,
+            skipDuplicates: true,
+          });
+        },
+      }),
+    }));
   }
 }
diff --git a/src/Graphql/graphql.generator.ts b/src/Graphql/graphql.generator.ts
index b0c82e8..56aed6d 100644
--- a/src/Graphql/graphql.generator.ts
+++ b/src/Graphql/graphql.generator.ts
@@ -14,7 +14,7 @@ import * as Prisma from '@prisma/client';
 import { SchemaBuilderToken } from '@smatch-corp/nestjs-pothos';
 
 //
-const filterOps = ['equals', 'in', 'notIn', 'not', 'is', 'isNot'] as const;
+const filterOps = ['equals', 'in', 'notIn', 'not', 'is'] as const;
 const sortableFilterProps = ['lt', 'lte', 'gt', 'gte'] as const;
 const stringFilterOps = [
   ...filterOps,
@@ -31,7 +31,7 @@ const scalarListOps = [
   'isEmpty',
   'equals',
 ] as const;
-const JsonFilterOps = ['equals', 'in', 'notIn', 'not', 'is', 'isNot'] as const;
+const JsonFilterOps = ['equals', 'in', 'notIn', 'not', 'is'] as const;
 const EnumFilterOps = ['equals', 'not'] as const;
 
 @Injectable()
@@ -564,6 +564,13 @@ export class PrismaCrudGenerator<Types extends SchemaTypes> {
       if (sortableTypes.includes(type as never)) {
         ops.push(...sortableFilterProps);
       }
+      if (type === 'Json') {
+        ops.push(...JsonFilterOps);
+      }
+      // type enum
+      if (type === 'Enum') {
+        ops.push(...EnumFilterOps);
+      }
 
       return this.builder.prismaFilter(type, {
         ops,