code: function defineModel(file) {
      var object      = require(file),
          options     = object.options || {},
          modelName   = object.modelName;
  
      if (debug) {
          fs.writeSync(debugFD, 'var ' + modelName + ' = Sequelize.define("' + modelName + '",\n' + util.inspect(object.attributes) + ',\n' + util.inspect(options, {depth: null}) + ');\n\n\n');
      }
  
      models[modelName] = sequelize.define(modelName, object.attributes, options);
      if (object.relations !== undefined) {
          relationships[modelName] = object.relations;
      }
  }
docs: Requires given npm module file and defines sequelize module according to exported object from that module.
  @private
  @param {string} file - Location of the npm module file which contains model definition.