Tips for customizing a generic repository error message

I have a GenericRepository class that provides basic functionality for interacting with persistence storage such as creating, finding, getting all, deleting, and updating data.

Within the find method, I am searching the database using its primary key. If the data is not found, it will throw an exception.

This generic repository class serves as a base class for other classes. I desire to receive more specific error messages indicating what type of data was not found.

For example, if the find method in my OrderRepository cannot locate any data, I want the error message to state 'Order is not found' rather than the generic message 'Data not found'.

Are there established best practices to achieve this functionality?

My project is written in Typescript.

javac#typescriptdomain-driven-designrepository-pattern

Answer №1

It is advisable not to raise exceptions when dealing with empty result sets from a 'find' operation in your repository.

Opt for returning an empty collection rather than null or throwing an exception.

Answer №2

From my personal experience, avoiding generic repositories can lead to a more successful implementation of Domain-Driven Design (DDD). Using specific repositories can help prevent issues in the future, such as the ability to display customized messages. By implementing different repositories, you have the flexibility to display tailored messages based on your preferences. For commonly used messages like "Data not found," consider creating a utility method within a class that can return appropriate messages based on the entity type.

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