A very simple Sequelize plugin which adds no update and readonly attributes support.

Have previously installed the sequelize package in the project.

npm install --save sequelize-noupdate-attributes

Add the plugin to the sequelize instance and then set the noupdate properties in your models, as shown in the basic example below:

var sequelizeNoUpdateAttributes = require('sequelize-noupdate-attributes');

var sequelize = new Sequelize('database', 'user', 'password');
sequelizeNoUpdateAttributes(sequelize); // Note that is the `sequelize` instance the passed reference.

var Post = sequelize.define('Post', {
  content: {
    type    : Sequelize.STRING,
    noUpdate: true
  }
});

What this do is to mark the content attribute so if an update is done, then:

• if the field previous value is null, it will accept the change
• if the field previous value is not null, it will trigger a SequelizeValidationErrorItem error.

so, the content field becomes a readonly after its becomes not null.

Works too with foreign key fields in associations:

models.Post.belongsTo(models.Person, {
  as        : 'Creator',
  foreignKey: {
    allowNull: false,
    noUpdate : true    // Will mark the `CreatorId` field to be `noUpdate`d.
  }
});

If you do want truly readonly attributes with no modifications at all being allowed, you can use the readonly option as shown below:

var Post = sequelize.define('Post', {
  content: {
    type    : Sequelize.STRING,
    noUpdate: {
      readOnly: true
    }
  }
});

which effectively disables any modification on the content attribute, no matter if the previous value was null or not, though exception is when the record is new.

The source is available for download from GitHub and there is a issue tracker so you can report bugs there.

To run the tests just execute npm test.

The MIT License (MIT)

Copyright (c) Diosney Sarmiento

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.