Added option to show original locations and path in error

README.md

@@ -88,9 +88,14 @@ to an error class created and returned by `createError` documented below.  Error
 initialized with a custom `time_thrown` ISODate (default is current ISODate) and `data` object (which will be merged with data specified through `createError`, if it exists).
 
 
-### createError(name, {message: String, [data: Object]}): ApolloError
+### createError(name, {message: String, [data: Object, options: Object]}): ApolloError
 
-Creates and returns an error class with the given `name` and `message`, optionally initialized with the given `data`.  `data` passed to `createError` will later be merged with any data passed to the constructor.
+Creates and returns an error class with the given `name` and `message`, optionally initialized with the given `data` and `options`.  `data` passed to `createError` will later be merged with any data passed to the constructor.
+
+#### Options (default):
+
+ - `showPath` *(false)*: Preserve the GraphQLError `path` data.
+ - `showLocations` *(false)*:  Preserve the GraphQLError `locations` data. 
 
 ### formatError (error, strict = false): ApolloError|Error|null
 If the error is a known ApolloError, returns the serialized form of said error.

src/index.js

@@ -11,53 +11,65 @@ class ApolloError extends ExtendableError {
   constructor (name, {
     message,
     time_thrown = (new Date()).toISOString(),
-    data = {}
+    data = {},
+    options = {},
   }) {
     const t = (arguments[2] && arguments[2].thrown_at) || time_thrown;
     const d = Object.assign({}, data, ((arguments[2] && arguments[2].data) || {}));
+    const opts = Object.assign({}, options, ((arguments[2] && arguments[2].options) || {}));
 
     super(serializeName([
       name,
       t,
       Object.assign({}, d, {
         toString: () => JSON.stringify(d)
-      })
+      }),
     ]));
 
     this._name = name;
     this._humanized_message = message || '';
     this._time_thrown = t;
     this._data = d;
+    this._locations = (opts.showLocations && arguments[2] && arguments[2].locations)
+    this._path = (opts.showPath && arguments[2] && arguments[2].path);
   }
   serialize () {
     const name = this._name;
     const message = this._humanized_message;
     const time_thrown = this._time_thrown;
     const data = this._data;
-    return {
+    const locations = this._locations;
+    const path = this._path;
+    let error = {
       message,
       name,
       time_thrown,
-      data
+      data,
     };
+    if (locations) error.locations = locations;
+    if (path) error.path = path;
+    return error;
   }
 }
 
-export const createError = (name, data = { message: 'An error has occurred' }) => {
+export const createError = (name, data = { message: 'An error has occurred', options }) => {
   const e = ApolloError.bind(null, name, data);
   errorMap.set(name, e);
   return e;
 };
 
 export const formatError = (originalError, returnNull = false) => {
   const [ name, thrown_at, d ] = deserializeName(originalError.message);
+  const { locations, path } = originalError;
   const data = d !== undefined ? JSON.parse(d) : {};
   if (!name) return returnNull ? null : originalError;
   const CustomError = errorMap.get(name);
   if (!CustomError) return returnNull ? null : originalError;
   const error = new CustomError({
     thrown_at,
-    data
+    data,
+    locations,
+    path,
   });
   return error.serialize();
 };

test/spec.js

@@ -8,15 +8,23 @@ describe('createError', () => {
       message: 'A foo error has occurred',
       data: {
         hello: 'world'
-      }
+      },
+      options: {
+        showLocations: false,
+        showPath: true,
+      },
     });
 
     const iso = new Date().toISOString();
 
     const e = new FooError({
       data: {
         foo: 'bar'
-      }
+      },
+      options: {
+        showLocations: true,
+        showPath: false,
+      },
     });
 
     const { message, name, time_thrown, data } = e.serialize();