Add support of saving authors and authorship

lib/models/author.js

@@ -0,0 +1,43 @@
+"use strict";
+
+// external modules
+var Sequelize = require("sequelize");
+
+// core
+var logger = require("../logger.js");
+
+module.exports = function (sequelize, DataTypes) {
+    var Author = sequelize.define("Author", {
+        id: {
+            type: Sequelize.INTEGER,
+            primaryKey: true,
+            autoIncrement: true
+        },
+        color: {
+            type: DataTypes.STRING
+        }
+    }, {
+        indexes: [
+            {
+                unique: true,
+                fields: ['noteId', 'userId']
+            }
+        ],
+        classMethods: {
+            associate: function (models) {
+                Author.belongsTo(models.Note, {
+                    foreignKey: "noteId",
+                    as: "note",
+                    constraints: false
+                });
+                Author.belongsTo(models.User, {
+                    foreignKey: "userId",
+                    as: "user",
+                    constraints: false
+                });
+            }
+        }
+    });
+    
+    return Author;
+};