Supported to define associations in model module.

README.md

@@ -342,6 +342,8 @@ Imports models into a Sequelize instance.
 
 Each model module implemented in `opts.models` directory will be imported into a Sequelize instance after connection to a database is established.
 The Sequelize instance will be returned with `Promise` upon success.
+If a model module has `associate()` as a part of `classMethods`, it will be called with `sequelize.models` as its argument after all models are loaded.
+So that it allows you to define [associations](http://docs.sequelizejs.com/en/v3/docs/associations/) between models.
 
 `opts.database`, `opts.username` and `opts.password` are passed to [Sequelize's constructor](http://docs.sequelizejs.com/en/v3/api/sequelize/#class-sequelize).
 Other options are also passed through to `options`, the 4th arugment of Sequelize's constructor.

lib/model.js

@@ -50,6 +50,14 @@ function load(opts, load_each)
           load_each(path.join(dirname, name), sequelize, logging);
         });
 
+        const models = sequelize.models;
+        _.keys(models).forEach((name) => {
+          const model = models[name];
+          if (_.isFunction(model.associate)) {
+            model.associate(models);
+          }
+        });
+
         resolve(sequelize);
       });
     });

test/models/task.js

@@ -0,0 +1,21 @@
+/*!
+ * exprest4
+ * Copyright (c) 2016 Hiromitsu Fujita <bow.fujita@gmail.com>
+ * MIT License
+ */
+
+'use strict';
+
+module.exports = (sequelize, DataTypes, schema) => {
+  return sequelize.define('task', {
+    title: DataTypes.STRING
+  , description: DataTypes.TEXT
+  }, {
+    schema: schema
+  , classMethods: {
+      associate: function(models) {
+        this.belongsTo(models.project, { as: 'project' });
+      }
+    }
+  });
+};