fix #18, cache users from fediverse

server/migrations/20190912093645-fedi_followers.js

@@ -0,0 +1,47 @@
+'use strict';
+
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return Promise.all([
+      queryInterface.removeColumn('users', 'followers'),
+      queryInterface.createTable('user_followers', {
+        userId: {
+          type: Sequelize.INTEGER,
+          references: {
+            model: 'users',
+            key: 'id'
+          },
+          primaryKey: true,
+          allowNull: false
+        },
+        fedUserApId: {
+          primaryKey: true,
+          type: Sequelize.STRING,
+          references: {
+            model: 'fed_users',
+            key: 'ap_id'
+          }
+        },
+        createdAt: { type: Sequelize.DATE, allowNull: false },
+        updatedAt: { type: Sequelize.DATE, allowNull: false }        
+      })
+  ])},
+
+  down: (queryInterface, Sequelize) => {
+    return Promise.all([
+      queryInterface.addColumn(
+      'users', 'followers', {
+        type: JSON,
+        defaultValue: []
+      }),
+      queryInterface.dropTable('user_followers')
+    ])
+    /*
+      Add reverting commands here.
+      Return a promise to correctly handle asynchronicity.
+
+      Example:
+      return queryInterface.dropTable('users');
+    */
+  }
+};