diff --git a/src/__tests__/composeWithMongooseDiscriminators-test.js b/src/__tests__/composeWithMongooseDiscriminators-test.js
index 8d3e2363..55e3b171 100644
--- a/src/__tests__/composeWithMongooseDiscriminators-test.js
+++ b/src/__tests__/composeWithMongooseDiscriminators-test.js
@@ -56,5 +56,21 @@ describe('composeWithMongooseDiscriminators ->', () => {
       expect(itc.isRequired('name')).toBe(true);
       expect(itc.isRequired('friends')).toBe(true);
     });
+
+    it('should be passed down record opts to resolvers', () => {
+      const typeComposer = composeWithMongooseDiscriminators(CharacterModel, {
+        resolvers: {
+          createOne: {
+            record: {
+              removeFields: ['friends'],
+              requiredFields: ['name'],
+            },
+          },
+        },
+      });
+      const createOneRecordArgTC = typeComposer.getResolver('createOne').getArgTC('record');
+      expect(createOneRecordArgTC.isRequired('name')).toBe(true);
+      expect(createOneRecordArgTC.hasField('friends')).toBe(false);
+    });
   });
 });
diff --git a/src/discriminators/__tests__/DiscriminatorTypeComposer-test.js b/src/discriminators/__tests__/DiscriminatorTypeComposer-test.js
index 907d7b92..6b471fd1 100644
--- a/src/discriminators/__tests__/DiscriminatorTypeComposer-test.js
+++ b/src/discriminators/__tests__/DiscriminatorTypeComposer-test.js
@@ -1,6 +1,12 @@
 /* @flow */
 
-import { schemaComposer, graphql, TypeComposer, InterfaceTypeComposer } from 'graphql-compose';
+import {
+  SchemaComposer,
+  schemaComposer,
+  graphql,
+  TypeComposer,
+  InterfaceTypeComposer,
+} from 'graphql-compose';
 import { getCharacterModels } from '../__mocks__/characterModels';
 import { MovieModel } from '../__mocks__/movieModel';
 import { composeWithMongoose } from '../../composeWithMongoose';
@@ -498,5 +504,31 @@ describe('DiscriminatorTypeComposer', () => {
 
       expect(tc.getFieldNames()).not.toEqual(expect.arrayContaining(['dob', 'starShips']));
     });
+
+    it('should pass down baseTypeComposerResolverOptions', () => {
+      const personTC = composeWithMongooseDiscriminators(CharacterModel, {
+        schemaComposer: new SchemaComposer(),
+        resolvers: {
+          createOne: {
+            record: {
+              removeFields: ['friends'],
+              requiredFields: ['name'],
+            },
+          },
+        },
+      }).discriminator(PersonModel, {
+        resolvers: {
+          createOne: {
+            record: {
+              requiredFields: ['dob'],
+            },
+          },
+        },
+      });
+      const createOneRecordArgTC = personTC.getResolver('createOne').getArgTC('record');
+      expect(createOneRecordArgTC.isRequired('name')).toBe(true);
+      expect(createOneRecordArgTC.isRequired('dob')).toBe(true);
+      expect(createOneRecordArgTC.hasField('friends')).toBe(false);
+    });
   });
 });
diff --git a/src/discriminators/__tests__/prepareChildResolvers-test.js b/src/discriminators/__tests__/prepareChildResolvers-test.js
new file mode 100644
index 00000000..147dc92e
--- /dev/null
+++ b/src/discriminators/__tests__/prepareChildResolvers-test.js
@@ -0,0 +1,37 @@
+/* @flow */
+
+import { schemaComposer } from 'graphql-compose';
+import { getCharacterModels } from '../__mocks__/characterModels';
+import { composeWithMongooseDiscriminators } from '../../composeWithMongooseDiscriminators';
+
+const { CharacterModel, PersonModel } = getCharacterModels('type');
+
+describe('prepareChildResolvers()', () => {
+  describe('copyResolverArgTypes()', () => {
+    afterAll(() => {
+      schemaComposer.clear();
+    });
+    // Note childResolver Arg fields are copied from baseResolver
+    const baseDTC = composeWithMongooseDiscriminators(CharacterModel, {
+      resolvers: {
+        createOne: {
+          requiredFields: ['kind'],
+        },
+      },
+    });
+    const PersonTC = baseDTC.discriminator(PersonModel);
+
+    it('should copy base common ResolverArgTypes to child', () => {
+      expect(
+        baseDTC
+          .getResolver('createOne')
+          .getArgTC('record')
+          .getFieldType('kind')
+      ).toEqual(
+        PersonTC.getResolver('createOne')
+          .getArgTC('record')
+          .getFieldType('kind')
+      );
+    });
+  });
+});
diff --git a/src/discriminators/prepareChildResolvers.js b/src/discriminators/prepareChildResolvers.js
index 992db0e2..ac1e43a4 100644
--- a/src/discriminators/prepareChildResolvers.js
+++ b/src/discriminators/prepareChildResolvers.js
@@ -59,30 +59,32 @@ function hideDKey<TContext>(
   }
 }
 
-// makes sure that all input fields are same as that on Interface,
-// that is all should be same as base typeComposer types
-// only changes for common properties, executed only once, on discriminator creation
-function setBaseInputTypesOnChildInputTypes<TContext>(
+// Set baseDTC resolver argTypes on childTC fields shared with DInterface
+function copyResolverArgTypes<TContext>(
   resolver: ResolverClass<any, TContext>,
   baseDTC: DiscriminatorTypeComposer<TContext>,
-  fromField: string[] | string
+  fromArg: string[] | string
 ) {
-  // set sharedField types on input types
   if (resolver && baseDTC.hasInputTypeComposer()) {
-    if (Array.isArray(fromField)) {
-      for (const field of fromField) {
-        setBaseInputTypesOnChildInputTypes(resolver, baseDTC, field);
+    if (Array.isArray(fromArg)) {
+      for (const field of fromArg) {
+        copyResolverArgTypes(resolver, baseDTC, field);
       }
-    } else if (fromField && resolver.hasArg(fromField)) {
-      const argTc = resolver.getArgTC(fromField);
-
-      const baseITCFields = baseDTC.getInputTypeComposer().getFieldNames();
-
-      for (const baseField of baseITCFields) {
-        if (argTc.hasField(baseField) && baseField !== '_id') {
-          argTc.extendField(baseField, {
-            type: baseDTC.getInputTypeComposer().getFieldType(baseField),
-          });
+    } else if (fromArg && resolver.hasArg(fromArg)) {
+      if (
+        baseDTC.hasResolver(resolver.name) &&
+        baseDTC.getResolver(resolver.name).hasArg(fromArg)
+      ) {
+        const childResolverArgTc = resolver.getArgTC(fromArg);
+        const baseResolverArgTC = baseDTC.getResolver(resolver.name).getArgTC(fromArg);
+        const baseResolverArgTCFields = baseResolverArgTC.getFieldNames();
+
+        for (const baseArgField of baseResolverArgTCFields) {
+          if (childResolverArgTc.hasField(baseArgField) && baseArgField !== '_id') {
+            childResolverArgTc.extendField(baseArgField, {
+              type: baseResolverArgTC.getFieldType(baseArgField),
+            });
+          }
         }
       }
     }
@@ -167,7 +169,7 @@ export function prepareChildResolvers<TContext>(
         default:
       }
 
-      setBaseInputTypesOnChildInputTypes(resolver, baseDTC, ['filter', 'record']);
+      copyResolverArgTypes(resolver, baseDTC, ['filter', 'record']);
       reorderFieldsRecordFilter(resolver, baseDTC, opts.reorderFields, ['filter', 'record']);
     }
   }
diff --git a/src/discriminators/utils/__tests__/mergeCustomizationOptions-test.js b/src/discriminators/utils/__tests__/mergeCustomizationOptions-test.js
index a611829c..f886bded 100644
--- a/src/discriminators/utils/__tests__/mergeCustomizationOptions-test.js
+++ b/src/discriminators/utils/__tests__/mergeCustomizationOptions-test.js
@@ -147,6 +147,12 @@ describe('mergeCustomizationOptions()', () => {
           removeFields: ['parent', 'child'],
         },
       },
+      updateById: {
+        record: {
+          removeFields: ['one', 'two'],
+          requiredFields: ['eight'],
+        },
+      },
       findMany: {
         limit: { defaultValue: 20 },
         // sort: false,
@@ -191,9 +197,9 @@ describe('mergeCustomizationOptions()', () => {
         },
       },
       updateById: {
-        input: {
-          removeFields: ['one', 'two', 'five'],
-          requiredFields: ['eight', 'two', 'five'],
+        record: {
+          removeFields: ['five'],
+          requiredFields: ['two', 'five'],
         },
       },
     },
@@ -228,7 +234,7 @@ describe('mergeCustomizationOptions()', () => {
       },
       findById: false,
       updateById: {
-        input: {
+        record: {
           removeFields: ['one', 'two', 'five'],
           requiredFields: ['eight', 'two', 'five'],
         },
@@ -236,6 +242,16 @@ describe('mergeCustomizationOptions()', () => {
     },
   };
 
+  it('should return most base options if no child', () => {
+    expect((mergeCustomizationOptions(baseCustomOptions): any).resolvers).toEqual(
+      baseCustomOptions.resolvers
+    );
+  });
+
+  it('should return child if no base is found', () => {
+    expect(mergeCustomizationOptions({}, childCustomOptions)).toEqual(childCustomOptions);
+  });
+
   it('should merge customisation Options', () => {
     expect(mergeCustomizationOptions(baseCustomOptions, childCustomOptions)).toEqual(expected);
   });