fix(mappingConverter): Replace invalid GraphQL characters on underscore.

Related #9

src/__tests__/mappingConverter-test.js

@@ -1,6 +1,6 @@
 /* @flow */
 
-import { TypeComposer, GraphQLJSON, graphql } from 'graphql-compose';
+import { TypeComposer, GraphQLJSON, graphql, GQC } from 'graphql-compose';
 import {
   convertToSourceTC,
   propertyToSourceGraphQLType,
@@ -225,4 +225,65 @@ describe('PropertiesConverter', () => {
       expect(getSubFields('range')).toEqual([]);
     });
   });
+
+  describe('issue #9', () => {
+    const mapping9 = {
+      properties: {
+        $id: {
+          type: 'long',
+        },
+        lastName: {
+          type: 'string',
+        },
+        email: {
+          type: 'string',
+          analyzer: 'email_analyzer',
+        },
+        $passwordHash: {
+          type: 'string',
+          index: 'not_analyzed',
+        },
+      },
+    };
+    const tc9 = convertToSourceTC(mapping9, 'Type9');
+
+    it('should replace unacceptable characters in GraphQL fieldnames', () => {
+      expect(tc9).toBeInstanceOf(TypeComposer);
+      expect(tc9.getFieldNames()).toEqual(
+        expect.arrayContaining(['_id', 'lastName', 'email', '_passwordHash'])
+      );
+    });
+
+    it('should work with graphql schema without errors', () => {
+      GQC.rootQuery().addFields({ userES: tc9 });
+      expect(() => GQC.buildSchema()).not.toThrowError();
+    });
+
+    it('should use Elastic field names from source', async () => {
+      GQC.rootQuery().addFields({ userES: tc9 });
+      const result = await graphql.graphql(
+        GQC.buildSchema(),
+        `query { userES { _id, lastName, email, _passwordHash } }`,
+        {
+          // simulate elastic responce
+          userES: {
+            $id: 123,
+            lastName: 'Tyler',
+            email: '[email protected]',
+            $passwordHash: 'abc1234def',
+          },
+        }
+      );
+      expect(result).toEqual({
+        data: {
+          userES: {
+            _id: 123,
+            lastName: 'Tyler',
+            email: '[email protected]',
+            _passwordHash: 'abc1234def',
+          },
+        },
+      });
+    });
+  });
 });

src/mappingConverter.js

@@ -107,30 +107,35 @@ export function convertToSourceTC(
   const fields = {};
   const pluralFields = opts.pluralFields || [];
 
-  Object.keys(properties).forEach(name => {
-    const gqType = propertyToSourceGraphQLType(properties[name], `${typeName}${upperFirst(name)}`, {
-      ...opts,
-      pluralFields: getSubFields(name, pluralFields),
-    });
+  Object.keys(properties).forEach(sourceName => {
+    const fieldName = sourceName.replace(/[^_a-zA-Z0-9]/g, '_');
+    const gqType = propertyToSourceGraphQLType(
+      properties[sourceName],
+      `${typeName}${upperFirst(fieldName)}`,
+      {
+        ...opts,
+        pluralFields: getSubFields(sourceName, pluralFields),
+      }
+    );
     if (gqType) {
-      if (pluralFields.indexOf(name) >= 0) {
-        fields[name] = {
+      if (pluralFields.indexOf(sourceName) >= 0) {
+        fields[fieldName] = {
           type: new GraphQLList(gqType),
           resolve: source => {
-            if (Array.isArray(source[name])) {
-              return source[name];
+            if (Array.isArray(source[sourceName])) {
+              return source[sourceName];
             }
-            return [source[name]];
+            return [source[sourceName]];
           },
         };
       } else {
-        fields[name] = {
+        fields[fieldName] = {
           type: gqType,
           resolve: source => {
-            if (Array.isArray(source[name])) {
-              return source[name][0];
+            if (Array.isArray(source[sourceName])) {
+              return source[sourceName][0];
             }
-            return source[name];
+            return source[sourceName];
           },
         };
       }