Check that property autoMigrations exists before checking its child property columnType

No more undefined errors

Author: andezzat

helpers/register-data-store.js

@@ -116,7 +116,7 @@ module.exports = require('machine').build({
 
         _.each(modelDef.definition, function checkAttributes(attribute, attributeName) {
 
-          if (attribute.type === 'number' && attribute.autoMigrations.columnType === 'bigint' && !attribute.autoCreatedAt && !attribute.autoUpdatedAt) {
+          if (attribute.type === 'number' && attribute.autoMigrations && attribute.autoMigrations.columnType === 'bigint' && !attribute.autoCreatedAt && !attribute.autoUpdatedAt) {
             throw flaverr('E_BIGINT_TYPE_MISMATCH', new Error('\nIn attribute `' + attributeName + '` of model `' + modelIdentity + '`:\nThe `bigint` column type cannot be used with the `number` attribute type.\nSince `bigint` values may be larger than the maximum JavaScript integer size, PostgreSQL will return them as strings.\nTherefore, attributes using this column type must be declared as type `string`, `ref` or `json`.\n'));
           }