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clasyquelize.js
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clasyquelize.js
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import { Sequelize, Model, DataTypes } from 'sequelize'
const serialize = Symbol('serialize')
class Clasyquelize extends Sequelize {
/**
* @param {... typeof ClasyModel} models
*/
attachModel(...models) {
for (const model of models) {
model.attach(this)
}
}
}
class ClasyAttribute {
/** @type {import('sequelize').DataType | import('sequelize').ModelAttributeColumnOptions} */
#options = null
/** @type {import('sequelize').ModelIndexesOptions[]} */
#indexes = null
/**
* @param {import('sequelize').DataType | import('sequelize').ModelAttributeColumnOptions} options
*/
constructor(options) {
this.#options = options
}
/**
* @param {import('sequelize').ModelIndexesOptions} [options]
* @returns {ClasyAttribute}
*/
index(options = {}) {
if (!this.#indexes) {
this.#indexes = []
}
this.#indexes.push(options)
return this
}
/**
* @param {string} name
* @returns {{options:import('sequelize').DataType | import('sequelize').ModelAttributeColumnOptions,indexes:import('sequelize').ModelIndexesOptions[]}}
*/
[serialize](name) {
const options = Object.assign({}, this.#options)
let indexes = null
if (this.#indexes) {
indexes = []
for (const indexRaw of this.#indexes) {
const { options: index } = new ClasyIndex(indexRaw)[serialize]()
if (!('fields' in index)) {
index.fields = [name]
}
indexes.push(index)
}
}
return { options, indexes }
}
}
class ClasyIndex {
/** @type {import('sequelize').ModelIndexesOptions} */
#options = null
/**
* @param {import('sequelize').ModelIndexesOptions} options
*/
constructor(options) {
this.#options = options
}
/**
* @param {string} [name]
* @returns {{options:import('sequelize').ModelIndexesOptions}}
*/
[serialize](name) {
const options = Object.assign({}, this.#options)
if (!('name' in options) && name) {
options.name = name
}
if ('fields' in options) {
options.fields = Array.from(options.fields)
}
return { options }
}
}
/** @type {WeakMap<typeof ClasyModel, Set<()=>void>> } */
const associationsFnScope = new WeakMap()
/** @type {WeakMap<typeof ClasyModel, WeakMap<typeof ClasyModel | import('sequelize').Association, import('sequelize').Association>> } */
const associationsScope = new WeakMap()
class ClasyModel extends Model {
/**
* @param {import('sequelize').DataType | import('sequelize').ModelAttributeColumnOptions} options
* @returns {ClasyAttribute}
*/
static attribute(options) {
return new ClasyAttribute(options)
}
/**
* @param {import('sequelize').ModelIndexesOptions} [options]
* @returns {ClasyIndex}
*/
static index(options) {
return new ClasyIndex(options)
}
/**
* @param {typeof ClasyModel | import('sequelize').Association} association
* @returns {import('sequelize').Association|void}
*/
static as(association) {
if (associationsScope.has(this)) {
return associationsScope.get(this).get(association)
}
}
/**
* @param {import('sequelize').Sequelize} sequelize
*/
static attach(sequelize) {
const { attributes, indexes } = serializeClasyModel(this)
this.init(attributes, { sequelize, indexes })
if (associationsFnScope.has(this)) {
for (const association of associationsFnScope.get(this)) {
association()
}
}
}
}
function serializeClasyModel(model, options = { attributes: {}, indexes: [], allNames: new Set() }) {
const { attributes, indexes, allNames } = options
const keys = Object.keys(model)
const ownAttributes = {}
const ownIndexes = []
for (const key of keys) {
if (!allNames.has(key)) {
const { value } = Reflect.getOwnPropertyDescriptor(model, key)
if (value instanceof ClasyAttribute) {
const { options, indexes: attrIndexes } = value[serialize](key)
ownAttributes[key] = options
if (attrIndexes) {
ownIndexes.push(...attrIndexes)
}
} else if (value in DataTypes) {
ownAttributes[key] = value
} else if (Object.isPrototypeOf.call(ClasyModel, value)) {
if (!associationsFnScope.has(model)) associationsFnScope.set(model, new Set([]))
associationsFnScope.get(model).add(() => {
const { foreignKey, as } = model[key] = model.belongsTo(value, { foreignKey: key, as: `$${key}` })
const association = value.hasMany(model, { foreignKey, as })
if (!associationsScope.has(value)) associationsScope.set(value, new WeakMap())
associationsScope.get(value).set(model, association)
associationsScope.get(value).set(model[key], association)
})
} else if (value instanceof ClasyIndex) {
const { options } = value[serialize](key)
ownIndexes.push(options)
}
allNames.add(key)
}
}
const nestedModel = Reflect.getPrototypeOf(model)
if (Object.isPrototypeOf.call(ClasyModel, nestedModel)) {
serializeClasyModel(nestedModel, options)
}
Object.assign(attributes, ownAttributes)
indexes.push(...ownIndexes)
return { attributes, indexes }
}
export * from 'sequelize'
export { Clasyquelize, ClasyModel }