fix: mapcf username to pg user (#10)

* fix: map Cloud Foundry username to pg user

* refactor: directly change this.options.credentials

__tests__/odata.js

@@ -19,7 +19,7 @@ describe('OData to Postgres dialect', () => {
         host: 'localhost',
         port: '5432',
         database: 'beershop',
-        user: 'postgres',
+        username: 'postgres',
         password: 'postgres',
       },
     })

index.js

@@ -6,6 +6,10 @@ module.exports = class PostgresDatabase extends HanaDatabase {
   constructor(...args) {
     super(...args)
     // maybe do more stuff
+    // Cloud Foundry provides the user in the field username the pg npm module expects user
+    if (this.options.credentials && this.options.credentials.username) {
+      this.options.credentials.user = this.options.credentials.username
+    }
     this._pool = new Pool(this.options.credentials)
   }