sync_alter.js

rootfs_overlay/lkmc/nodejs/sequelize/sync_alter.js

@@ -0,0 +1,110 @@
+#!/usr/bin/env node
+
+// https://stackoverflow.com/questions/17708620/sequelize-changing-model-schema-on-production
+
+const assert = require('assert');
+const path = require('path');
+
+const { Sequelize, DataTypes } = require('sequelize');
+
+(async () => {
+{
+  const sequelize = new Sequelize({
+    dialect: 'sqlite',
+    storage: 'tmp.' + path.basename(__filename) + '.sqlite',
+  });
+  const IntegerNames = sequelize.define('IntegerNames', {
+    value: { type: DataTypes.INTEGER, },
+    name: { type: DataTypes.STRING, },
+  }, {});
+  await IntegerNames.sync({force: true})
+  await IntegerNames.create({value: 2, name: 'two'});
+  await IntegerNames.create({value: 3, name: 'three'});
+  await sequelize.close();
+}
+
+// Alter by adding column..
+{
+  const sequelize = new Sequelize({
+    dialect: 'sqlite',
+    storage: 'tmp.' + path.basename(__filename) + '.sqlite',
+  });
+  const IntegerNames = sequelize.define('IntegerNames', {
+    value: { type: DataTypes.INTEGER, },
+    name: { type: DataTypes.STRING, },
+    nameEs: { type: DataTypes.STRING, },
+  }, {});
+  await IntegerNames.sync({alter: true})
+  await IntegerNames.create({value: 5, name: 'five' , nameEs: 'cinco'});
+  await IntegerNames.create({value: 7, name: 'seven', nameEs: 'siete'});
+  const integerNames = await IntegerNames.findAll({
+    order: [['value', 'ASC']],
+  });
+  assert(integerNames[0].value  === 2);
+  assert(integerNames[0].name   === 'two');
+  assert(integerNames[0].nameEs === null);
+  assert(integerNames[1].name   === 'three');
+  assert(integerNames[1].nameEs === null);
+  assert(integerNames[2].name   === 'five');
+  assert(integerNames[2].nameEs === 'cinco');
+  assert(integerNames[3].name   === 'seven');
+  assert(integerNames[3].nameEs === 'siete');
+  await sequelize.close();
+}
+
+// Alter by removing column. undefined instead of null,
+// because the values really aren't present in the database anymore.
+{
+  const sequelize = new Sequelize({
+    dialect: 'sqlite',
+    storage: 'tmp.' + path.basename(__filename) + '.sqlite',
+  });
+  const IntegerNames = sequelize.define('IntegerNames', {
+    value: { type: DataTypes.INTEGER, },
+    name: { type: DataTypes.STRING, },
+  }, {});
+  await IntegerNames.sync({alter: true})
+  const integerNames = await IntegerNames.findAll({
+    order: [['value', 'ASC']],
+  });
+  assert(integerNames[0].value  === 2);
+  assert(integerNames[0].name   === 'two');
+  assert(integerNames[0].nameEs === undefined);
+  assert(integerNames[1].name   === 'three');
+  assert(integerNames[1].nameEs === undefined);
+  assert(integerNames[2].name   === 'five');
+  assert(integerNames[2].nameEs === undefined);
+  assert(integerNames[3].name   === 'seven');
+  assert(integerNames[3].nameEs === undefined);
+  await sequelize.close();
+}
+
+// Alter a type.
+// Hmm, docs suggest data would get dropped, but I only see typecast without alter.drop,
+// so shy does it work still?. sqlite from CLI does confirm that it is now a VARCHAR(255)
+// column.
+{
+  const sequelize = new Sequelize({
+    dialect: 'sqlite',
+    storage: 'tmp.' + path.basename(__filename) + '.sqlite',
+  });
+  const IntegerNames = sequelize.define('IntegerNames', {
+    value: { type: DataTypes.STRING, },
+    name: { type: DataTypes.STRING, },
+  }, {});
+  await IntegerNames.sync({alter: true})
+  const integerNames = await IntegerNames.findAll({
+    order: [['value', 'ASC']],
+  });
+  assert(integerNames[0].value === '2');
+  assert(integerNames[0].name  === 'two');
+  assert(integerNames[1].value === '3');
+  assert(integerNames[1].name  === 'three');
+  assert(integerNames[2].value === '5');
+  assert(integerNames[2].name  === 'five');
+  assert(integerNames[3].value === '7');
+  assert(integerNames[3].name  === 'seven');
+  await sequelize.close();
+}
+
+})();