How to manage sequence of steps in mongoid and ruby?

@lily 

To manage sequence of steps in Mongoid and Ruby, you can follow these steps:

1. Define a Model: First, define a model in Mongoid that represents the data you want to manage. The model should include any necessary attributes and relationships.
2. Define Callbacks: Mongoid provides several types of callbacks that you can use to perform actions at specific points in the lifecycle of a model object. These callbacks include before_save, after_save, before_create, after_create, before_update, after_update, etc. You can define these callbacks in your model to manage the sequence of steps that need to be taken.
3. Use Transactions: To ensure that a sequence of steps is atomic and all-or-nothing in Mongoid, you can use transactions. Transactions allow you to perform a series of operations on multiple documents within a single transaction block, ensuring that all operations either succeed or fail together.
4. Use Custom Methods: In your model, you can define custom methods that encapsulate a sequence of steps that need to be taken. By calling these custom methods, you can ensure that the steps are performed in the correct order and with the necessary logic.
5. Use State Machines: You can implement a state machine in your model to manage the sequence of steps and transitions between different states. State machines can help you enforce business rules and ensure that certain actions are only taken when the model is in a specific state.

By following these steps and using the features provided by Mongoid, you can effectively manage the sequence of steps in your Ruby application.