No native build steps, CocoaPods, or Android linking required. This is a pure Node.js library.

Project setup

1. Copy the source/ directory into your project, e.g. src/lib/objection/.

2. Point your require/import alias at the entry point:

   tsconfig.json (TypeScript path alias):

   {
     "compilerOptions": {
       "paths": {
         "objection-src/*": ["src/lib/objection/*"]
       }
     }
   }
   

3. Configure knex before using any model:

   import Knex from 'knex';
   const knex = Knex({ client: 'pg', connection: process.env.DATABASE_URL });
   

4. Set Model.knex(knex) once at application bootstrap (see examples below).

5. Environment variables required:

   • DATABASE_URL — your full database connection string (no built-in fallback).

6. No Babel transform is required when running on Node 14+. The source uses CommonJS (require/module.exports) throughout.

Public API

Model

import { Model } from './source/objection';

class Person extends Model {
  static tableName: string;
  static relationMappings: Record<string, RelationMapping>;
}

Subclass Model to define a table-backed entity. Declare tableName and optionally jsonSchema for validation, and relationMappings for typed relationships. All query methods (query(), $query(), $relatedQuery()) are inherited.

transaction

import { transaction } from './source/objection';

transaction(ModelA, ModelB, async (BoundA, BoundB, trx) => Promise<T>): Promise<T>;
transaction(knexInstance, callback): Promise<T>;

Wraps one or more model classes (or a raw knex instance) in a database transaction. All models passed as leading arguments are rebound to the transaction object; the last argument must be the async callback. Rejects if model classes are bound to different databases.

initialize

import { initialize } from './source/objection';

initialize(knex: Knex, modelClasses: typeof Model[]): Promise<void>;
initialize(modelClasses: typeof Model[]): Promise<void>;

Prefetches table metadata (column names, types) for all supplied model classes in parallel. Call once at startup before serving requests to avoid per-query metadata round-trips.

ref

import { ref } from './source/objection';
ref(expression: string): ReferenceBuilder;

Creates a safe column reference for use inside query builder calls (e.g. where(ref('table.col'))) without raw string interpolation.

raw

import { raw } from './source/objection';
raw(sql: string, ...bindings: any[]): RawBuilder;

Wraps a raw SQL fragment with bindings. Use inside QueryBuilder methods when the query builder DSL is insufficient.

Working examples

Scenario - Basic model definition and querying

Define a Person model, bind knex, then run typed queries using the bundled QueryBuilder.

import Knex from 'knex';
// Import directly from the source entry point
const { Model } = require('./src/lib/objection/objection');

const knex = Knex({
  client: 'pg',
  connection: process.env.DATABASE_URL,
});

Model.knex(knex);

class Person extends Model {
  static tableName = 'persons';

  static get jsonSchema() {
    return {
      type: 'object',
      required: ['name'],
      properties: {
        id: { type: 'integer' },
        name: { type: 'string', minLength: 1 },
        age: { type: 'integer' },
      },
    };
  }
}

async function run() {
  const people = await Person.query().where('age', '>', 18).orderBy('name');
  console.log(people);

  const inserted = await Person.query().insert({ name: 'Alice', age: 30 });
  console.log(inserted.id);
}

run().finally(() => knex.destroy());

Scenario - Relation mapping and eager loading

Wire a HasManyRelation and load it with a relation expression.

const { Model, HasManyRelation } = require('./src/lib/objection/objection');

class Animal extends Model {
  static tableName = 'animals';
}

class Person extends Model {
  static tableName = 'persons';

  static get relationMappings() {
    return {
      pets: {
        relation: HasManyRelation,
        modelClass: Animal,
        join: { from: 'persons.id', to: 'animals.owner_id' },
      },
    };
  }
}

async function loadWithPets() {
  // Fetch persons with their pets eagerly
  const persons = await Person.query().withGraphFetched('pets');
  console.log(persons[0].pets);
}

Scenario - Transactions across multiple models

Use the transaction helper to coordinate inserts across two models atomically.

const { transaction, Model, HasManyRelation } = require('./src/lib/objection/objection');

// (Assume Person and Animal are defined as above and knex is bound)

async function createPersonWithPet(personData, animalData) {
  return transaction(Person, Animal, async (BoundPerson, BoundAnimal, trx) => {
    const person = await BoundPerson.query(trx).insert(personData);
    const animal = await BoundAnimal.query(trx).insert({
      ...animalData,
      owner_id: person.id,
    });
    return { person, animal };
  });
}

createPersonWithPet({ name: 'Bob', age: 25 }, { name: 'Rex' })
  .then(console.log)
  .catch(console.error);

Scenario - Startup initialization with prefetched metadata

const Knex = require('knex');
const { initialize, Model } = require('./src/lib/objection/objection');

const knex = Knex({ client: 'pg', connection: process.env.DATABASE_URL });
Model.knex(knex);

// Assume Person and Animal models are defined and imported
async function bootstrap() {
  await initialize(knex, [Person, Animal]);
  console.log('Table metadata cached — server ready');
}

bootstrap().catch((err) => { console.error(err); process.exit(1); });

File walkthrough

• objection.js — Single entry point; re-exports every public class and helper. Import from here unless you need internal internals.
• transaction.js — Implements the transaction() function; handles both knex-instance and model-class overloads.
• initialize.js — Runs fetchTableMetadata on all models in parallel to warm the metadata cache.
• model/Model.js — The Model base class; all ORM functionality (query, validation, hooks, relations) anchors here.
• model/AjvValidator.js — Default JSON Schema validator backed by ajv + ajv-formats.
• model/Validator.js — Abstract validator base; subclass to replace Ajv with custom validation.
• model/ValidationError.js / NotFoundError.js — Typed errors thrown by model operations.
• model/graph/ — Builds an internal graph of model instances and edges for graph insert/upsert traversal.
• queryBuilder/QueryBuilder.js — Full-featured query builder; extends QueryBuilderBase with relation and graph methods.
• queryBuilder/RelationExpression.js — Parses eager-load strings like 'pets.vaccinations'.
• queryBuilder/RawBuilder.js / ReferenceBuilder.js / ValueBuilder.js / FunctionBuilder.js — Typed wrappers for SQL fragments used inside queries.
• queryBuilder/graph/ — Orchestrates graph upsert/insert/patch/delete across the model graph.
• queryBuilder/join/ — Implements join-based eager loading (joinRelated, withGraphJoined).
• queryBuilder/transformations/ — Applies post-build transformations (currently wraps MySQL modify subqueries).
• queryBuilder/operations/ — Internal operation objects that compose to form a final SQL query.
• relations/ — All five relation types: HasOneRelation, HasManyRelation, BelongsToOneRelation, HasOneThroughRelation, ManyToManyRelation.
• utils/ — Shared utilities: promise helpers, identifier case mappers, mixin/compose, object utilities.

Common pitfalls and fixes

• Model.knex() not called before queries — every query will throw; call Model.knex(knex) once at app startup before any query is executed.
• initialize() skipped in production — first queries will trigger per-model metadata fetches under load; always await initialize(knex, [...models]) during startup.
• Mixing ES modules and CommonJS — the source is pure CJS (require/module.exports); if your project uses ESM, import via createRequire or set "type": "commonjs" in the source package.json.
• AJV peer version conflict — the bundled AjvValidator uses ajv@8; if your project also uses ajv, pin both to ^8 to avoid duplicate validator instances.
• Multiple knex instances in transaction() — all model classes passed to transaction() must share the same knex instance or the call rejects with a clear error; use Model.bindKnex(knex) per model if needed.
• MySQL subquery wrapping — the WrapMysqlModifySubqueryTransformation in transformations/ is applied automatically; do not apply it manually or queries will be double-wrapped.

Vibe-coding prompt template

I have the Objection.js ORM library source (objection@3.1.5) located at `src/lib/objection/`
and a usage guide at `USAGE.md`. My project is a Node.js/TypeScript Express API using knex
for database access.

Please help me integrate this source step-by-step:

1. Read `USAGE.md` for all real export names, file paths, and working examples.
2. Create a `src/db.ts` that initializes knex and calls `Model.knex()` using the source at
   `src/lib/objection/objection.js`.
3. Create at least two Model subclasses matching my schema (I will describe them below).
4. Wire relation mappings using the relation classes exported from `src/lib/objection/objection.js`
   (HasManyRelation, BelongsToOneRelation, etc.).
5. Add a startup call to `initialize()` from `src/lib/objection/initialize.js` before the
   Express server begins listening.
6. Show a sample Express route that uses `transaction()` from `src/lib/objection/transaction.js`
   to insert related records atomically.

Only use exports that appear in USAGE.md or the source files. Do not invent new APIs.
Upstream package reference: user@example.com

License and credit

Objection.js is released under the MIT License. See source/LICENSE if present, or refer to the official repository. Upstream npm package: user@example.com.

This product’s unique contribution is clean room implementation of valuable code block into AVCP compatible standard.

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