fix(filterOperators): field operators in filter arg now do not crea…

…te nested types without fields

src/resolvers/helpers/__tests__/filterOperators-test.ts

@@ -1,6 +1,7 @@
 import mongoose from 'mongoose';
-import { schemaComposer, InputTypeComposer } from 'graphql-compose';
+import { schemaComposer, InputTypeComposer, SchemaComposer, graphql } from 'graphql-compose';
 import { composeWithMongoose } from '../../../composeWithMongoose';
+import { composeMongoose } from '../../../composeMongoose';
 
 import {
   _createOperatorsField,
@@ -271,4 +272,68 @@ describe('Resolver helper `filter` ->', () => {
       });
     });
   });
+
+  describe('integration tests', () => {
+    it('should not throw error: must define one or more fields', async () => {
+      const OrderDetailsSchema = new mongoose.Schema(
+        {
+          productID: Number,
+          unitPrice: Number,
+          quantity: Number,
+          discount: Number,
+        },
+        {
+          _id: false,
+        }
+      );
+
+      const OrderSchema = new mongoose.Schema(
+        {
+          orderID: {
+            type: Number,
+            description: 'Order unique ID',
+            unique: true,
+          },
+          customerID: String,
+          employeeID: Number,
+          orderDate: Date,
+          requiredDate: Date,
+          shippedDate: Date,
+          shipVia: Number,
+          freight: Number,
+          shipName: String,
+          details: {
+            type: [OrderDetailsSchema],
+            index: true,
+            description: 'List of ordered products',
+          },
+        },
+        {
+          collection: 'northwind_orders',
+        }
+      );
+
+      const OrderModel = mongoose.model<any>('Order', OrderSchema);
+
+      const OrderTC = composeMongoose(OrderModel);
+
+      const orderFindOneResolver = OrderTC.mongooseResolvers.findOne();
+
+      const sc = new SchemaComposer();
+      sc.Query.addFields({
+        order: orderFindOneResolver,
+      });
+
+      const schema = sc.buildSchema();
+
+      const res = await graphql.graphql({
+        schema,
+        source: `{ __typename }`,
+      });
+
+      expect(res?.errors?.[0]?.message).not.toBe(
+        'Input Object type FilterFindOneOrderDetailsOperatorsInput must define one or more fields.'
+      );
+    });
+  });
 });

src/resolvers/helpers/filterOperators.ts

@@ -1,12 +1,5 @@
-import {
-  getNamedType,
-  GraphQLInputObjectType,
-  GraphQLScalarType,
-  GraphQLEnumType,
-  GraphQLString,
-} from 'graphql-compose/lib/graphql';
 import type { Model } from 'mongoose';
-import { InputTypeComposer, inspect } from 'graphql-compose';
+import { EnumTypeComposer, InputTypeComposer, inspect, ScalarTypeComposer } from 'graphql-compose';
 import type { InputTypeComposerFieldConfigAsObjectDefinition } from 'graphql-compose';
 
 import { upperFirst, getIndexesFromModel } from '../../utils';
@@ -89,24 +82,23 @@ export function _availableOperatorsFields(
     : availableOperators;
 
   operators.forEach((operatorName: string) => {
-    // unwrap from GraphQLNonNull and GraphQLList, if present
-    const fieldType = getNamedType(itc.getFieldType(fieldName));
+    const fieldTC = itc.getFieldTC(fieldName);
 
-    if (fieldType) {
+    if (fieldTC) {
       if (['in', 'nin', 'in[]', 'nin[]'].includes(operatorName)) {
         // wrap with GraphQLList, if operator required this with `[]`
         const newName = operatorName.slice(-2) === '[]' ? operatorName.slice(0, -2) : operatorName;
-        fields[newName] = { type: [fieldType] as any };
+        fields[newName] = { type: [fieldTC] };
       } else {
         if (operatorName === 'exists') {
           fields[operatorName] = { type: 'Boolean' };
         } else if (operatorName === 'regex') {
           // Only for fields with type String allow regex operator
-          if (fieldType === GraphQLString) {
+          if (fieldTC.getTypeName() === 'String') {
             fields[operatorName] = { type: GraphQLRegExpAsString };
           }
         } else {
-          fields[operatorName] = { type: fieldType as any };
+          fields[operatorName] = { type: fieldTC };
         }
       }
     }
@@ -148,15 +140,14 @@ export function _recurseSchema(
     }
 
     const fieldTC = sourceITC.getFieldTC(fieldName);
-    const fieldType = fieldTC.getType();
 
     // prevent infinite recursion
-    if (sourceITC.getType() === fieldType) return;
+    if (sourceITC === fieldTC) return;
 
     const baseTypeName = `${opts.baseTypeName}${upperFirst(fieldName)}`;
     const inputFieldTypeName = `${opts.prefix || ''}${baseTypeName}${opts.suffix || ''}`;
 
-    if (fieldType instanceof GraphQLScalarType || fieldType instanceof GraphQLEnumType) {
+    if (fieldTC instanceof ScalarTypeComposer || fieldTC instanceof EnumTypeComposer) {
       if (
         fieldOperatorsConfig &&
         !Array.isArray(fieldOperatorsConfig) &&
@@ -181,7 +172,7 @@ export function _recurseSchema(
           [fieldName]: fieldOperatorsITC,
         });
       }
-    } else if (fieldType instanceof GraphQLInputObjectType) {
+    } else if (fieldTC instanceof InputTypeComposer) {
       const fieldOperatorsITC = schemaComposer.createInputTC(inputFieldTypeName);
       _recurseSchema(
         fieldOperatorsITC,
@@ -194,9 +185,12 @@ export function _recurseSchema(
         indexedFields,
         fieldPath
       );
-      inputITC.addFields({
-        [fieldName]: fieldOperatorsITC,
-      });
+
+      if (fieldOperatorsITC.getFieldNames().length > 0) {
+        inputITC.addFields({
+          [fieldName]: fieldOperatorsITC,
+        });
+      }
     }
   });
 }