diff --git a/src/index.js b/src/index.js
index 9de26b6..16c540e 100644
--- a/src/index.js
+++ b/src/index.js
@@ -2,6 +2,7 @@ import {graphql} from 'graphql';
 import {getTypes} from './type';
 import {getSchema} from './schema';
 import {getModels} from './model';
+import {processId} from './query';
 
 function _getTypes(mongooseModels) {
   const graffitiModels = getModels(mongooseModels);
@@ -11,11 +12,13 @@ function _getTypes(mongooseModels) {
 export default {
   graphql,
   getSchema,
-  getTypes: _getTypes
+  getTypes: _getTypes,
+  processId
 };
 
 export {
   graphql,
   getSchema,
-  _getTypes as getTypes
+  _getTypes as getTypes,
+  processId
 };
diff --git a/src/query/query.js b/src/query/query.js
index 7cf8c48..656616e 100644
--- a/src/query/query.js
+++ b/src/query/query.js
@@ -325,7 +325,8 @@ export default {
   getListResolver,
   getAddOneMutateHandler,
   getUpdateOneMutateHandler,
-  getDeleteOneMutateHandler
+  getDeleteOneMutateHandler,
+  processId
 };
 
 export {
@@ -337,5 +338,6 @@ export {
   getUpdateOneMutateHandler,
   getDeleteOneMutateHandler,
   getListResolver,
-  connectionFromModel
+  connectionFromModel,
+  processId
 };
diff --git a/src/schema/schema.js b/src/schema/schema.js
index 461571a..595cef7 100644
--- a/src/schema/schema.js
+++ b/src/schema/schema.js
@@ -1,4 +1,4 @@
-import {reduce, isArray} from 'lodash';
+import {reduce, isArray, isFunction} from 'lodash';
 import {
   GraphQLList,
   GraphQLNonNull,
@@ -222,6 +222,7 @@ function getFields(graffitiModels, {
     hooks = {}, mutation = true, allowMongoIDMutation = false,
     customQueries = {}, customMutations = {}
   } = {}) {
+
   const types = type.getTypes(graffitiModels);
   const {viewer, singular} = hooks;
 
@@ -258,8 +259,8 @@ function getFields(graffitiModels, {
       }
     };
   }, {
-    queries: customQueries,
-    mutations: customMutations
+    queries: isFunction(customQueries) ? customQueries(types) : customQueries,
+    mutations: isFunction(customMutations) ? customMutations(types) : customMutations
   });
 
   const RootQuery = new GraphQLObjectType({