This guide covers advanced aspects of working with Orionjs schemas, including composition, inheritance, and complex validation.

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Schema Composition

You can compose schemas together to create more complex structures: 
import {schemaWithName, InferSchemaType} from '@orion-js/schema'

// Base schemas
export const AddressSchema = schemaWithName('AddressSchema', {
  street: {type: String},
  city: {type: String},
  zipCode: {type: String}
})

export const NameSchema = schemaWithName('NameSchema', {
  firstName: {type: String},
  lastName: {type: String}
})

// Composed schema
export const UserSchema = schemaWithName('UserSchema', {
  _id: {type: String},
  
  // Embed the name schema
  name: {type: NameSchema},
  
  // Embed the address schema
  address: {type: AddressSchema, optional: true},
  
  email: {type: String}
})

export type UserType = InferSchemaType<typeof UserSchema>

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Arrays of Complex Types

Working with arrays of objects: 
import {schemaWithName, InferSchemaType} from '@orion-js/schema'

export const TagSchema = schemaWithName('TagSchema', {
  name: {type: String},
  color: {type: String, optional: true}
})

export const PostSchema = schemaWithName('PostSchema', {
  _id: {type: String},
  title: {type: String},
  
  // Array of primitive values
  categories: {type: [String]},
  
  // Array of complex objects
  tags: {type: [TagSchema], minLength: 1, maxLength: 10}
})

export type PostType = InferSchemaType<typeof PostSchema>

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Conditional Validation

You can implement conditional validation based on other field values: 
import {schemaWithName, InferSchemaType} from '@orion-js/schema'

export const PaymentSchema = schemaWithName('PaymentSchema', {
  method: {
    type: String,
    allowedValues: ['credit_card', 'bank_transfer', 'paypal']
  },
  
  // Credit card details, required only when method is 'credit_card'
  cardNumber: {
    type: String,
    optional: true,
    validate: (value, {doc}) => {
      if (doc.method === 'credit_card' && !value) {
        return 'required-for-credit-card'
      }
      if (value && !/^\d{16}$/.test(value)) {
        return 'invalid-card-number'
      }
    }
  },
  
  // PayPal email, required only when method is 'paypal'
  paypalEmail: {
    type: String,
    optional: true,
    validate: (value, {doc}) => {
      if (doc.method === 'paypal' && !value) {
        return 'required-for-paypal'
      }
    }
  }
})

export type PaymentType = InferSchemaType<typeof PaymentSchema>

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Custom Types with Transformation

Creating a custom type with validation and transformation: 
import {schemaWithName, InferSchemaType, createType} from '@orion-js/schema'

// Custom type for phone numbers
const PhoneNumberType = createType({
  name: 'phoneNumber',
  validate(value) {
    if (!/^\+?[0-9\s-()]+$/.test(value)) {
      return 'invalid-phone-format'
    }
  },
  clean(value) {
    // Remove non-digit characters
    return value.replace(/[^0-9+]/g, '')
  }
})

export const ContactSchema = schemaWithName('ContactSchema', {
  name: {type: String},
  phone: {type: PhoneNumberType}
})

export type ContactType = InferSchemaType<typeof ContactSchema>