Conditionally Publishing Models in Sails.js with Waterline and Hooks: A Guide to Dynamic Model Management

8 August 2024

Introduction to Conditional Publishing in Sails.js

Conditional publishing in Sails.js can be a powerful feature for managing complex model data. By leveraging the flexibility of Waterline, you can create dynamic models that adapt to different scenarios, resulting in more scalable and efficient applications.
In this article, we will explore how to implement conditional publishing using Waterline and Hooks in Sails.js. We’ll cover the setup, configuration, and example use cases for this feature, ensuring you have a solid grasp of how it works and can apply it effectively in your projects.

Setting Up Conditional Publishing with Waterline

To start, ensure that you have Waterline configured in your Sails.js project. You can do this by running sails new myproject followed by sails lift to initialize the default config.
Next, let’s define a simple model using Waterline. For our example, we’ll create a User model with attributes for name and email.

// models/User.js
module.exports = {
  schema: true,
  attributes: {
    name: {
      type: 'string',
      required: true
    },
    email: {
      type: 'email',
      unique: true,
      required: true
    }
  }
};

Creating a Hook for Conditional Publishing

Now, let’s create a hook to conditionally publish our User model. In Sails.js, hooks are used to extend the functionality of models or controllers.

// api/hooks/conditional-publish-hook.js
module.exports = function (hooks) {
  return {
    async afterCreate(model) {
      const user = await User.findOne({ email: model.email });
      if (!user || !user.activated) {
        // publish condition not met, do not publish the user
        await User.destroyOne({ id: model.id });
      } else {
        // publish condition met, save and publish the user
        await User.updateOne({ id: model.id }, { activated: true });
      }
    },
  };
};

Configuring the Hook

After creating your hook, you need to configure it in Sails.js. This involves adding an entry for the hook in sails.config.hooks.

// config/hook.js
module.exports = {
  conditionalPublishHook: require('path/to/conditional-publish-hook')
};

Then, add a line to your sails.config.models file to attach this hook to the User model.

// models/User.js
module.exports = {
  // existing code...
  hooks: ['conditionalPublishHook']
};

Conclusion

Implementing conditional publishing in Sails.js using Waterline and Hooks provides a robust way to manage complex data. This feature can be particularly useful for creating dynamic models that adapt based on various conditions, ensuring your applications are scalable and efficient.
In this guide, we explored how to set up and configure conditional publishing with Waterline and Hooks in Sails.js. We also provided example use cases for illustrating the practical application of this feature. By following the steps outlined here, you can easily integrate conditional publishing into your Sails.js projects, making them more dynamic and flexible.

Poespas Blog