Is there a way to combine Joi Schemas?

Question

Is there a way to combine two joi schemes into one scheme?

Scheme 1

{
  alpha: Joi.number().required(),
  beta: Joi.string().required(),
  chalie: Joi.object({
    xray: Joi.number().required(),
  }).required()
}

Scheme 1

{
  delta: Joi.string().required(),
  echo: Joi.number().required(),
  charlie: Joi.object({
    zulu: Joi.string().required(),
  }).required()
}

Combined circuit:

{
  alpha: Joi.number().required(),
  beta: Joi.string().required(),
  chalie: Joi.object({
    xray: Joi.number().required(),
    zulu: Joi.string().required(),
  }).required()
  delta: Joi.string().required(),
  echo: Joi.number().required(),
}

Without nested objects, this is easy to do with Object.assign, but even deep merging objects will not work with nested objects, because a nested object is a function call.

Answer 1

Using simple javascript objects was not an option for me. I tried using the method .keysfor extension, but it overwrites existing keys (for charlie in this case).

The solution I settled on was using .reach: Example:

const Joi = require('joi');
const originalSchema = Joi.object({
  a: { 
    deep: {
      b: Joi.string()
    }    
  },
  c: Joi.string()
});
const extendedSchema = Joi.object({
  a: { 
    deep: Joi
      .reach(originalSchema, 'a.deep')
      .keys({ anotherB: Joi.string() })
  },
  c: Joi.reach(originalSchema, 'c')
});

// No errors
extendedSchema.validate({ a: { deep: { b: 'hi', anotherB: 'hi' } }, c: 'wow' })

Answer 2

Joi.append?

https://github.com/hapijs/joi/blob/v13.5.2/API.md#objectkeysschema

// Validate key a
const base = Joi.object().keys({
    a: Joi.number()
});

// Validate keys a, b.
const extended = base.append({
    b: Joi.string()
});

Answer 3

, : https://github.com/hapijs/joi/blob/v9.0.4/API.md#anyconcatschema

const a = Joi.string().valid('a');
const b = Joi.string().valid('b');
const ab = a.concat(b);

,

Answer 4

Javascript Object.assign(), , Joi .keys().

:

const schema1 = Joi.object({
  alpha: Joi.number().required(),
  beta: Joi.string().required(),
  charlie: Joi.object({
    xray: Joi.number().required(),
  }).required()
});

const schema2 = Joi.object({
  delta: Joi.string().required(),
  echo: Joi.number().required(),
  charlie: Joi.object({
    zulu: Joi.string().required(),
  }).required()
});

const mergedSchema = schema1.keys(schema2);

JS Joi.object();

{} JS, . , validate() , JS.

, , {} validate(), .

Joi.object([schema]), , validate() .

, Ankh's JS:

const schema1 = {
  alpha: Joi.number().required(),
  beta: Joi.string().required(),
  charlie: Joi.object({
    xray: Joi.number().required(),
  }).required()
};

const schema2 ={
  delta: Joi.string().required(),
  echo: Joi.number().required(),
  charlie: Joi.object({
    zulu: Joi.string().required(),
  }).required()
};

const mergedSchema = Object.assign({}, schema1, schema2);

.

Answer 5

https://github.com/hapijs/joi/blob/v15.0.1/API.md#objectappendschema

object.append([]) , :

schema - an optional object, where an object of type joi is assigned to each key. If the schema is empty, undefined, or {}, the changes will not be applied. Uses object.keys ([schema]) to add keys.

// Validate key a
const base = Joi.object().keys({
    a: Joi.number()
});
// Validate keys a, b.
const extended = base.append({
    b: Joi.string()
});