Fixed the different column name in datasource (#255)

* Fixed the different column name in datasource

Issue #250

* Added test to change the nullable property

* moved the code from the function into test block

lib/migration.js

@@ -307,7 +307,8 @@ function mixinMigration(MySQL, mysql) {
     function actualize(propName, oldSettings) {
       var newSettings = m.properties[propName];
       if (newSettings && changed(newSettings, oldSettings)) {
-        var pName = self.client.escapeId(propName);
+        // Check if the property has a different column name in the database (other than property name)
+        var pName = (newSettings.mysql && newSettings.mysql.columnName) || self.client.escapeId(propName);
         sql.push('CHANGE COLUMN ' + pName + ' ' + pName + ' ' +
           self.buildColumnDefinition(model, propName));
       }

test/mysql.autoupdate.test.js

@@ -18,8 +18,7 @@ describe('MySQL connector', function() {
   });
 
   it('should auto migrate/update tables', function(done) {
-    var schema_v1 =
-      {
+    var schema_v1 = {
       'name': 'CustomerTest',
       'options': {
         'idInjection': false,
@@ -61,8 +60,7 @@ describe('MySQL connector', function() {
       },
     };
 
-    var schema_v2 =
-      {
+    var schema_v2 = {
       'name': 'CustomerTest',
       'options': {
         'idInjection': false,
@@ -222,6 +220,49 @@ describe('MySQL connector', function() {
     verifyMysqlColumnNameAutoupdate(done);
   });
 
+  it('should update the nullable property of "first_name" to false', function(done) {
+    // update the model "required" property
+    var schema = {
+      name: 'ColRenameTest',
+      options: {
+        idInjection: false,
+        mysql: {
+          schema: 'myapp_test',
+          table: 'col_rename_test',
+        },
+      },
+      properties: {
+        firstName: {
+          type: 'String',
+          required: true,
+          length: 40,
+          mysql: {
+            columnName: 'first_name',
+            dataType: 'varchar',
+            dataLength: 40,
+          },
+        },
+        lastName: {
+          type: 'String',
+          required: false,
+          length: 40,
+        },
+      },
+    };
+
+    ds.createModel(schema.name, schema.properties, schema.options);
+
+    // nullable should be updated to false
+    ds.autoupdate('ColRenameTest', function(err) {
+      assert.ifError(err);
+      ds.discoverModelProperties('col_rename_test', function(err, props) {
+        assert.equal(props[0].nullable, 'N');
+        assert.equal(props[0].columnName, 'first_name');
+        done();
+      });
+    });
+  });
+
   function verifyMysqlColumnNameAutoupdate(done) {
     ds.autoupdate('ColRenameTest', function(err) {
       ds.discoverModelProperties('col_rename_test', function(err, props) {