[#6] add relationship between models.

src/app.js

@@ -3,12 +3,13 @@
 import Koa from 'koa'
 import body from 'koa-body'
 import person from './person/router'
-import { errors } from './middleware'
+import { errors, track } from './middleware'
 
 export default () => {
   const app = new Koa()
   app.name = 'techtalk(20170322)'
   app.use(body({ multipart: true }))
+  app.use(track())
   app.use(errors())
   for (const router of [person]) {
     app.use(router.routes()).use(router.allowedMethods())

src/history/model.js

@@ -0,0 +1,42 @@
+//@flow
+
+import Sequelize from 'sequelize'
+import Database from '../database'
+import Person from '../person/model'
+
+const History = Database.getInstance().define('history', {
+  path: Sequelize.STRING,
+  body: Sequelize.TEXT,
+  host: Sequelize.STRING,
+  user_agent: Sequelize.STRING,
+  time: {
+    type: Sequelize.DATE,
+    defaultValue: Sequelize.NOW
+  }
+}, {
+  underscored: true,
+  timestamps: false,
+  scopes: {
+    last(action: string) {
+      return {
+        where: { action },
+        limit: 1,
+        order: [['time', 'DESC']],
+        attributes: ['time', 'action'],
+        include: [{
+          model: Person,
+          attributes: ['first_name', 'last_name']
+        }]
+      }
+    }
+  }
+})
+
+Person.hasMany(History, {
+  onDelete: 'cascade'
+})
+History.belongsTo(Person, {
+  constraints: false
+})
+
+export default History

src/middleware/index.js

@@ -2,3 +2,4 @@
 
 export {default as errors} from './errors'
 export {default as auth} from './auth'
+export {default as track} from './track'

src/middleware/track.js

@@ -0,0 +1,22 @@
+//@flow
+
+import History from '../history/model'
+
+export default () => {
+  return async (ctx: any, next: Function) => {
+    await next()
+    if (ctx.status != 200) {
+      return
+    }
+    const { state: { person } } = ctx
+    if (person) {
+      console.log(person.Model.associations.histories.accessors);
+      await person.createHistory({
+        path: `${ctx.method} ${ctx.path}`,
+        body: JSON.stringify(ctx.request.body),
+        host: ctx.header['host'],
+        user_agent: ctx.header['user-agent']
+      })
+    }
+  }
+}