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This is a fix for an edge case, where a query context could be already set in a `Model.query()` call or in a custom QueryBuilder's constructor.
In our case we are defining columns with a custom `@DefaultOrderBy(columns)` decorator, they are stored to query's context after query builder is instantiated, and eventually are read in `query.onBuild()` hook to apply sorting for a query, if none other was provided to it in the meantime.
But when coupled with fetching graphs, where both parent and children models have `@DefaultOrderBy` configured, child model's query context (eager query to fetch models for a relation) was being completely overwritten with parent's query context, and that, in our case, resulted in using invalid columns to be passed to `orderBy()`, resulting in a sql error.

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Objection.js is an ORM for Node.js that aims to stay out of your way and make it as easy as possible to use the full power of SQL and the underlying database engine while still making the common stuff easy and enjoyable.

Even though ORM is the best commonly known acronym to describe objection, a more accurate description is to call it a relational query builder. You get all the benefits of an SQL query builder but also a powerful set of tools for working with relations.

Objection.js is built on an SQL query builder called knex. All databases supported by knex are supported by objection.js. SQLite3, Postgres and MySQL are thoroughly tested.

What objection.js gives you:

What objection.js doesn't give you:

  • A fully object oriented view of your database With objection you don't work with entities. You work with queries. Objection doesn't try to wrap every concept with an object oriented equivalent. The best attempt to do that (IMO) is Hibernate, which is excellent, but it has 800k lines of code and a lot more concepts to learn than SQL itself. The point is, writing a good traditional ORM is borderline impossible. Objection attempts to provide a completely different way of working with SQL.
  • A custom query DSL. SQL is used as a query language. This doesn't mean you have to write SQL strings though. A query builder based on knex is used to build the SQL. However, if the query builder fails you for some reason, raw SQL strings can be easily written using the raw helper function.
  • Automatic database schema creation and migration from model definitions. For simple things it is useful that the database schema is automatically generated from the model definitions, but usually just gets in your way when doing anything non-trivial. Objection.js leaves the schema related things to you. knex has a great migration tool that we recommend for this job. Check out the example project.

The best way to get started is to clone our example project and start playing with it. There's also a typescript version available.

Check out this issue to see who is using objection and what they think about it.