Entry module commands

To make the business logic around changes to entry models easier to extend, we will first need to extract out the methods in the module’s services that update the database as individual commands. Let’s start with converting the blog entry create method to a command in Nest.js CQRS fashion.

export class CreateEntryCommand implements ICommand {
    constructor(
        public readonly title: string,
        public readonly content: string,
        public readonly userId: number
    ) {}
}

Our command is a simple object that implemented the ICommand interface. The ICommand interface is used internally by Nest.js to indicate an object is a command. This file is typically created in a sub-directory of our module with a pattern similar to commands/impl/. Now that we have one example done, let’s finish up the remaining commands for the comment module.

export class UpdateEntryCommand implements ICommand {
    constructor(
        public readonly id...