118 lines
3.9 KiB
TypeScript
118 lines
3.9 KiB
TypeScript
import { isPlainObject } from 'lodash'
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import { Model as SequelizeModel, ModelStatic, Sequelize } from 'sequelize'
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import { logger } from '@server/helpers/logger'
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/**
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*
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* Build Sequelize models from sequelize raw query (that must use { nest: true } options)
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*
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* In order to sequelize to correctly build the JSON this class will ingest,
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* the columns selected in the raw query should be in the following form:
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* * All tables must be Pascal Cased (for example "VideoChannel")
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* * Root table must end with `Model` (for example "VideoCommentModel")
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* * Joined tables must contain the origin table name + '->JoinedTable'. For example:
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* * "Actor" is joined to "Account": "Actor" table must be renamed "Account->Actor"
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* * "Account->Actor" is joined to "Server": "Server" table must be renamed to "Account->Actor->Server"
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* * Selected columns must be renamed to contain the JSON path:
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* * "videoComment"."id": "VideoCommentModel"."id"
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* * "Account"."Actor"."Server"."id": "Account.Actor.Server.id"
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* * All tables must contain the row id
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*/
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export class ModelBuilder <T extends SequelizeModel> {
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private readonly modelRegistry = new Map<string, T>()
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constructor (private readonly sequelize: Sequelize) {
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}
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createModels (jsonArray: any[], baseModelName: string): T[] {
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const result: T[] = []
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for (const json of jsonArray) {
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const { created, model } = this.createModel(json, baseModelName, json.id + '.' + baseModelName)
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if (created) result.push(model)
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}
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return result
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}
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private createModel (json: any, modelName: string, keyPath: string) {
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if (!json.id) return { created: false, model: null }
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const { created, model } = this.createOrFindModel(json, modelName, keyPath)
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for (const key of Object.keys(json)) {
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const value = json[key]
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if (!value) continue
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// Child model
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if (isPlainObject(value)) {
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const { created, model: subModel } = this.createModel(value, key, keyPath + '.' + json.id + '.' + key)
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if (!created || !subModel) continue
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const Model = this.findModelBuilder(modelName)
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const association = Model.associations[key]
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if (!association) {
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logger.error('Cannot find association %s of model %s', key, modelName, { associations: Object.keys(Model.associations) })
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continue
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}
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if (association.isMultiAssociation) {
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if (!Array.isArray(model[key])) model[key] = []
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model[key].push(subModel)
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} else {
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model[key] = subModel
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}
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}
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}
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return { created, model }
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}
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private createOrFindModel (json: any, modelName: string, keyPath: string) {
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const registryKey = this.getModelRegistryKey(json, keyPath)
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if (this.modelRegistry.has(registryKey)) {
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return {
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created: false,
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model: this.modelRegistry.get(registryKey)
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}
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}
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const Model = this.findModelBuilder(modelName)
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if (!Model) {
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logger.error(
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'Cannot build model %s that does not exist', this.buildSequelizeModelName(modelName),
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{ existing: this.sequelize.modelManager.all.map(m => m.name) }
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)
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return { created: false, model: null }
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}
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const model = Model.build(json, { raw: true, isNewRecord: false })
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this.modelRegistry.set(registryKey, model)
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return { created: true, model }
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}
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private findModelBuilder (modelName: string) {
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return this.sequelize.modelManager.getModel(this.buildSequelizeModelName(modelName)) as ModelStatic<T>
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}
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private buildSequelizeModelName (modelName: string) {
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if (modelName === 'Avatars') return 'ActorImageModel'
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if (modelName === 'ActorFollowing') return 'ActorModel'
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if (modelName === 'ActorFollower') return 'ActorModel'
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if (modelName === 'FlaggedAccount') return 'AccountModel'
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return modelName + 'Model'
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}
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private getModelRegistryKey (json: any, keyPath: string) {
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return keyPath + json.id
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}
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}
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