mirror of
https://github.com/swc-project/swc.git
synced 2024-12-24 14:16:12 +03:00
992 lines
27 KiB
TypeScript
992 lines
27 KiB
TypeScript
// Loaded from https://deno.land/x/denodb@v1.0.18/lib/model.ts
|
||
|
||
|
||
import type {
|
||
Operator,
|
||
OrderByClauses,
|
||
OrderDirection,
|
||
QueryBuilder,
|
||
QueryDescription,
|
||
QueryType,
|
||
} from "./query-builder.ts";
|
||
import type { Database } from "./database.ts";
|
||
import type { PivotModelSchema } from "./model-pivot.ts";
|
||
import { camelCase } from "../deps.ts";
|
||
import {
|
||
DataTypes,
|
||
FieldAlias,
|
||
FieldOptions,
|
||
FieldProps,
|
||
FieldType,
|
||
FieldTypeString,
|
||
FieldValue,
|
||
Values,
|
||
} from "./data-types.ts";
|
||
|
||
/** Represents a Model class, not an instance. */
|
||
export type ModelSchema = typeof Model;
|
||
|
||
export type ModelFields = { [key: string]: FieldType };
|
||
export type ModelDefaults = {
|
||
[field: string]: FieldValue | (() => FieldValue);
|
||
};
|
||
export type ModelPivotModels = { [modelName: string]: PivotModelSchema };
|
||
export type FieldMatchingTable = { [clientField: string]: string };
|
||
|
||
export type ModelOptions = {
|
||
queryBuilder: QueryBuilder;
|
||
database: Database;
|
||
};
|
||
|
||
export type AggregationResult = Model & {
|
||
avg?: number;
|
||
count?: number;
|
||
max?: number;
|
||
min?: number;
|
||
sum?: number;
|
||
};
|
||
|
||
export type ModelEventType =
|
||
| "creating"
|
||
| "created"
|
||
| "updating"
|
||
| "updated"
|
||
| "deleting"
|
||
| "deleted";
|
||
|
||
export type ModelEventListenerWithModel = (model: Model) => void;
|
||
export type ModelEventListenerWithoutModel = (model?: Model) => void;
|
||
export type ModelEventListener =
|
||
| ModelEventListenerWithoutModel
|
||
| ModelEventListenerWithModel;
|
||
|
||
export type ModelEventListeners = {
|
||
[eventType in ModelEventType]?: ModelEventListener[];
|
||
};
|
||
|
||
/** Model that can be used with a `Database`. */
|
||
export class Model {
|
||
[attribute: string]: FieldValue | Function
|
||
|
||
/** Table name as it should be saved in the database. */
|
||
static table = "";
|
||
|
||
/** Should this model have `created_at` and `updated_at` fields by default. */
|
||
static timestamps = false;
|
||
|
||
/** Model fields. */
|
||
static fields: ModelFields = {};
|
||
|
||
/** Default values for the model fields. */
|
||
static defaults: ModelDefaults = {};
|
||
|
||
/** Pivot table to use for a given model. */
|
||
static pivot: ModelPivotModels = {};
|
||
|
||
/** If the model has been created in the database. */
|
||
private static _isCreatedInDatabase: boolean = false;
|
||
|
||
/** Query builder instance. */
|
||
private static _queryBuilder: QueryBuilder;
|
||
|
||
/** Database which this model will be attached to. */
|
||
private static _database: Database;
|
||
|
||
/** Model primary key. Manually found through `_findPrimaryKey()`. */
|
||
private static _primaryKey: string;
|
||
|
||
/** Model field matching, from database to client and vice versa. */
|
||
private static _fieldMatching: {
|
||
toDatabase: FieldMatchingTable;
|
||
toClient: FieldMatchingTable;
|
||
} = {
|
||
toDatabase: {},
|
||
toClient: {},
|
||
};
|
||
|
||
/** Model current query being built. */
|
||
private static _currentQuery: QueryBuilder;
|
||
|
||
/** Options this model was initialized with. */
|
||
private static _options: ModelOptions;
|
||
|
||
/** Attached event listeners. */
|
||
private static _listeners: ModelEventListeners = {};
|
||
|
||
/** Link a model to a database. Should not be called from a child model. */
|
||
static _link(options: ModelOptions) {
|
||
this._options = options;
|
||
this._database = options.database;
|
||
this._queryBuilder = options.queryBuilder;
|
||
|
||
this._fieldMatching = this._database._computeModelFieldMatchings(
|
||
this.name,
|
||
this.fields,
|
||
this.timestamps,
|
||
);
|
||
|
||
this._currentQuery = this._queryBuilder.queryForSchema(this);
|
||
this._primaryKey = this._findPrimaryKey();
|
||
}
|
||
|
||
/** Drop a model in the database. */
|
||
static async drop() {
|
||
const dropQuery = this._options.queryBuilder
|
||
.queryForSchema(this)
|
||
.table(this.table)
|
||
.dropIfExists()
|
||
.toDescription();
|
||
|
||
await this._options.database.query(dropQuery);
|
||
|
||
this._isCreatedInDatabase = false;
|
||
}
|
||
|
||
/** Create a model in the database. Should not be called from a child model. */
|
||
static async createTable() {
|
||
if (this._isCreatedInDatabase) {
|
||
throw new Error("This model has already been initialized.");
|
||
}
|
||
|
||
const createQuery = this._options.queryBuilder
|
||
.queryForSchema(this)
|
||
.table(this.table)
|
||
.createTable(
|
||
this.formatFieldToDatabase(this.fields) as ModelFields,
|
||
this.formatFieldToDatabase(this.defaults) as ModelDefaults,
|
||
{
|
||
withTimestamps: this.timestamps,
|
||
ifNotExists: true,
|
||
},
|
||
)
|
||
.toDescription();
|
||
|
||
await this._options.database.query(createQuery);
|
||
|
||
this._isCreatedInDatabase = true;
|
||
}
|
||
|
||
/** Manually find the primary field by going through the schema fields. */
|
||
private static _findPrimaryField(): FieldOptions {
|
||
const field = Object.entries(this.fields).find(
|
||
([_, fieldType]) => typeof fieldType === "object" && fieldType.primaryKey,
|
||
);
|
||
|
||
return {
|
||
name: field ? (this.formatFieldToDatabase(field[0]) as string) : "",
|
||
type: field ? field[1] : DataTypes.INTEGER,
|
||
defaultValue: 0,
|
||
};
|
||
}
|
||
|
||
/** Manually find the primary key by going through the schema fields. */
|
||
private static _findPrimaryKey(): string {
|
||
return this._findPrimaryField().name;
|
||
}
|
||
|
||
/** Return the model computed primary key. */
|
||
static getComputedPrimaryKey(): string {
|
||
if (!this._primaryKey) {
|
||
this._primaryKey = this._findPrimaryKey();
|
||
}
|
||
|
||
return this._primaryKey;
|
||
}
|
||
|
||
/** Return the field type of the primary key. */
|
||
static getComputedPrimaryType(): FieldTypeString {
|
||
const field = this._findPrimaryField();
|
||
|
||
return typeof field.type === "object"
|
||
? (field.type as any).type
|
||
: field.type;
|
||
}
|
||
|
||
/** Return the field properties of the primary key */
|
||
static getComputedPrimaryProps(): FieldProps {
|
||
const field = this._findPrimaryField();
|
||
|
||
return typeof field === "object" ? field.type : {};
|
||
}
|
||
|
||
/** Build the current query and run it on the associated database. */
|
||
private static async _runQuery(query: QueryDescription) {
|
||
this._currentQuery = this._queryBuilder.queryForSchema(this);
|
||
|
||
if (query.type) {
|
||
this._runEventListeners(query.type);
|
||
}
|
||
|
||
const results = await this._database.query(query);
|
||
|
||
if (query.type) {
|
||
this._runEventListeners(query.type, results);
|
||
}
|
||
|
||
return results;
|
||
}
|
||
|
||
/** Format a field or an object of fields, following a field matching table.
|
||
* Defaulting to `defaultCase` or `field` otherwise. */
|
||
private static _formatField(
|
||
fieldMatching: FieldMatchingTable,
|
||
field: string | { [fieldName: string]: any },
|
||
defaultCase?: (field: string) => string,
|
||
): string | { [fieldName: string]: any } {
|
||
if (typeof field !== "string") {
|
||
return Object.entries(field).reduce((prev: any, [fieldName, value]) => {
|
||
prev[this._formatField(fieldMatching, fieldName) as string] = value;
|
||
return prev;
|
||
}, {}) as { [fieldName: string]: any };
|
||
}
|
||
|
||
if (field in fieldMatching) {
|
||
return fieldMatching[field];
|
||
}
|
||
|
||
return defaultCase ? defaultCase(field) : field;
|
||
}
|
||
|
||
/** Format field or an object of fields from client to database. */
|
||
static formatFieldToDatabase(field: string | Object) {
|
||
return this._formatField(this._fieldMatching.toDatabase, field);
|
||
}
|
||
|
||
/** Format field or an object of fields from database to client. */
|
||
static formatFieldToClient(field: string | Object) {
|
||
return this._formatField(this._fieldMatching.toClient, field, camelCase);
|
||
}
|
||
|
||
/** Add an event listener for a specific operation/hook.
|
||
*
|
||
* Flight.on('created', (model) => console.log('New model:', model));
|
||
*/
|
||
static on<T extends ModelSchema>(
|
||
this: T,
|
||
eventType: ModelEventType,
|
||
callback: ModelEventListener,
|
||
) {
|
||
if (!(eventType in this._listeners)) {
|
||
this._listeners[eventType] = [];
|
||
}
|
||
|
||
this._listeners[eventType]!.push(callback);
|
||
|
||
return this;
|
||
}
|
||
|
||
/** Alias for `Model.on`, add an event listener for a specific operation/hook.
|
||
*
|
||
* Flight.addEventListener('created', (model) => console.log('New model:', model));
|
||
*/
|
||
static addEventListener<T extends ModelSchema>(
|
||
this: T,
|
||
eventType: ModelEventType,
|
||
callback: ModelEventListener,
|
||
) {
|
||
return this.on(eventType, callback);
|
||
}
|
||
|
||
static removeEventListener(
|
||
eventType: ModelEventType,
|
||
callback: ModelEventListener,
|
||
) {
|
||
if (!(eventType in this._listeners)) {
|
||
throw new Error(
|
||
`There is no event listener for ${eventType}. You might be trying to remove a listener that you haven't added with Model.on('${eventType}', ...).`,
|
||
);
|
||
}
|
||
|
||
this._listeners[eventType] = this._listeners[eventType]!.filter((
|
||
listener,
|
||
) => listener !== callback);
|
||
|
||
return this;
|
||
}
|
||
|
||
/** Run event listeners given a query type and results. */
|
||
private static _runEventListeners(
|
||
queryType: QueryType,
|
||
instances?: Model | Model[],
|
||
) {
|
||
// -ing => present, -ed => past
|
||
const isPastEvent = !!instances;
|
||
|
||
let eventType: ModelEventType;
|
||
switch (queryType) {
|
||
case "insert":
|
||
eventType = isPastEvent ? "created" : "creating";
|
||
break;
|
||
|
||
case "update":
|
||
eventType = isPastEvent ? "updated" : "updating";
|
||
break;
|
||
|
||
case "delete":
|
||
eventType = isPastEvent ? "deleted" : "deleting";
|
||
break;
|
||
|
||
default:
|
||
return;
|
||
}
|
||
|
||
const listeners = this._listeners[eventType];
|
||
|
||
if (!listeners) {
|
||
return;
|
||
}
|
||
|
||
for (const listener of listeners) {
|
||
if (instances) {
|
||
if (Array.isArray(instances)) {
|
||
if (instances.length > 0) {
|
||
instances.forEach(listener);
|
||
} else {
|
||
(listener as ModelEventListenerWithoutModel)();
|
||
}
|
||
} else {
|
||
listener(instances);
|
||
}
|
||
} else {
|
||
(listener as ModelEventListenerWithoutModel)();
|
||
}
|
||
}
|
||
}
|
||
|
||
/** Return the table name followed by a field name. Can also rename a field using `nameAs`.
|
||
*
|
||
* Flight.field("departure") => "flights.departure"
|
||
*
|
||
* Flight.field("id", "flight_id") => { flight_id: "flights.id" }
|
||
*/
|
||
static field(field: string): string;
|
||
static field(field: string, nameAs: string): FieldAlias;
|
||
static field(field: string, nameAs?: string): string | FieldAlias {
|
||
const fullField = this.formatFieldToDatabase(
|
||
`${this.table}.${field}`,
|
||
) as string;
|
||
|
||
if (nameAs) {
|
||
return { [nameAs]: fullField };
|
||
}
|
||
|
||
return fullField;
|
||
}
|
||
|
||
/** Run the current query. */
|
||
static async get() {
|
||
return this._runQuery(
|
||
this._currentQuery.table(this.table).get().toDescription(),
|
||
);
|
||
}
|
||
|
||
/** Fetch all the model records.
|
||
*
|
||
* await Flight.all();
|
||
*
|
||
* await Flight.select("id").all();
|
||
*/
|
||
static async all() {
|
||
return this.get() as Promise<Model[]>;
|
||
}
|
||
|
||
/** Indicate which fields should be returned/selected from the query.
|
||
*
|
||
* await Flight.select("id").get();
|
||
*
|
||
* await Flight.select("id", "destination").get();
|
||
*/
|
||
static select<T extends ModelSchema>(
|
||
this: T,
|
||
...fields: (string | FieldAlias)[]
|
||
) {
|
||
this._currentQuery.select(
|
||
...fields.map((field) => this.formatFieldToDatabase(field)),
|
||
);
|
||
return this;
|
||
}
|
||
|
||
/** Create one or multiple records in the current model.
|
||
*
|
||
* await Flight.create({ departure: "Paris", destination: "Tokyo" });
|
||
*
|
||
* await Flight.create([{ ... }, { ... }]);
|
||
*/
|
||
static async create(values: Values): Promise<Model>;
|
||
static async create(values: Values[]): Promise<Model[]>;
|
||
static async create(values: Values | Values[]) {
|
||
const insertions = Array.isArray(values) ? values : [values];
|
||
|
||
const results = await this._runQuery(
|
||
this._currentQuery.table(this.table).create(
|
||
insertions.map((field) =>
|
||
this.formatFieldToDatabase(field)
|
||
) as Values[],
|
||
).toDescription(),
|
||
);
|
||
|
||
if (!Array.isArray(values) && Array.isArray(results)) {
|
||
return results[0];
|
||
}
|
||
|
||
return results;
|
||
}
|
||
|
||
/** Find one or multiple records based on the model primary key.
|
||
*
|
||
* await Flight.find("1");
|
||
*/
|
||
static async find(idOrIds: FieldValue): Promise<Model>;
|
||
static async find(idOrIds: FieldValue[]): Promise<Model[]>;
|
||
static async find(idOrIds: FieldValue | FieldValue[]) {
|
||
const results = await this._runQuery(
|
||
this._currentQuery
|
||
.table(this.table)
|
||
.find(
|
||
this.getComputedPrimaryKey(),
|
||
Array.isArray(idOrIds) ? idOrIds : [idOrIds],
|
||
)
|
||
.toDescription(),
|
||
);
|
||
|
||
return Array.isArray(idOrIds) ? results : (results as Model[])[0];
|
||
}
|
||
|
||
/** Order query results based on a field name and an optional direction.
|
||
*
|
||
* await Flight.orderBy("departure").all();
|
||
*
|
||
* await Flight.orderBy("departure", "desc").all();
|
||
*
|
||
* await Flight.orderBy({ departure: "desc", destination: "asc" }).all();
|
||
*/
|
||
static orderBy<T extends ModelSchema>(
|
||
this: T,
|
||
fieldOrFields: string | OrderByClauses,
|
||
orderDirection: OrderDirection = "asc",
|
||
) {
|
||
if (typeof fieldOrFields === "string") {
|
||
this._currentQuery.orderBy(
|
||
this.formatFieldToDatabase(fieldOrFields) as string,
|
||
orderDirection,
|
||
);
|
||
} else {
|
||
for (
|
||
const [field, orderDirectionField] of Object.entries(
|
||
fieldOrFields,
|
||
)
|
||
) {
|
||
this._currentQuery.orderBy(
|
||
this.formatFieldToDatabase(field) as string,
|
||
orderDirectionField,
|
||
);
|
||
}
|
||
}
|
||
|
||
return this;
|
||
}
|
||
|
||
/** Group rows by a given field.
|
||
*
|
||
* await Flight.groupBy('departure').all();
|
||
*/
|
||
static groupBy<T extends ModelSchema>(this: T, field: string) {
|
||
this._currentQuery.groupBy(this.formatFieldToDatabase(field) as string);
|
||
return this;
|
||
}
|
||
|
||
/** Similar to `limit`, limit the number of results returned from the query.
|
||
*
|
||
* await Flight.take(10).get();
|
||
*/
|
||
static take<T extends ModelSchema>(this: T, limit: number) {
|
||
return this.limit(limit);
|
||
}
|
||
|
||
/** Limit the number of results returned from the query.
|
||
*
|
||
* await Flight.limit(10).get();
|
||
*/
|
||
static limit<T extends ModelSchema>(this: T, limit: number) {
|
||
this._currentQuery.limit(limit);
|
||
return this;
|
||
}
|
||
|
||
/** Return the first record that matches the current query.
|
||
*
|
||
* await Flight.where("id", ">", "1").first();
|
||
*/
|
||
static async first() {
|
||
this.take(1);
|
||
const results = await this.get();
|
||
return (results as Model[])[0];
|
||
}
|
||
|
||
/** Skip n values in the results.
|
||
*
|
||
* await Flight.offset(10).get();
|
||
*
|
||
* await Flight.offset(10).limit(2).get();
|
||
*/
|
||
static offset<T extends ModelSchema>(this: T, offset: number) {
|
||
this._currentQuery.offset(offset);
|
||
return this;
|
||
}
|
||
|
||
/** Similar to `offset`, skip n values in the results.
|
||
*
|
||
* await Flight.skip(10).get();
|
||
*
|
||
* await Flight.skip(10).take(2).get();
|
||
*/
|
||
static skip<T extends ModelSchema>(this: T, offset: number) {
|
||
return this.offset(offset);
|
||
}
|
||
|
||
/** Add a `where` clause to your query.
|
||
*
|
||
* await Flight.where("id", "1").get();
|
||
*
|
||
* await Flight.where("id", ">", "1").get();
|
||
*
|
||
* await Flight.where({ id: "1", departure: "Paris" }).get();
|
||
*/
|
||
static where<T extends ModelSchema>(
|
||
this: T,
|
||
fieldOrFields: string | Values,
|
||
operatorOrFieldValue?: Operator | FieldValue,
|
||
fieldValue?: FieldValue,
|
||
) {
|
||
if (typeof fieldOrFields === "string") {
|
||
const whereOperator: Operator = typeof fieldValue !== "undefined"
|
||
? (operatorOrFieldValue as Operator)
|
||
: "=";
|
||
|
||
const whereValue: FieldValue = typeof fieldValue !== "undefined"
|
||
? fieldValue
|
||
: (operatorOrFieldValue as FieldValue);
|
||
|
||
if (whereValue !== undefined) {
|
||
this._currentQuery.where(
|
||
this.formatFieldToDatabase(fieldOrFields) as string,
|
||
whereOperator,
|
||
whereValue,
|
||
);
|
||
}
|
||
} else {
|
||
// TODO(eveningkid): cannot do multiple where with different operators
|
||
// Need to find a great API for multiple where potentially with operators
|
||
// .where({ name: 'John', age: { moreThan: 19 } })
|
||
// and then format it using Knex .andWhere(...)
|
||
|
||
for (const [field, value] of Object.entries(fieldOrFields)) {
|
||
if (value === undefined) {
|
||
continue;
|
||
}
|
||
|
||
this._currentQuery.where(
|
||
this.formatFieldToDatabase(field) as string,
|
||
"=",
|
||
value,
|
||
);
|
||
}
|
||
}
|
||
|
||
return this;
|
||
}
|
||
|
||
/** Update one or multiple records. Also update `updated_at` if `timestamps` is `true`.
|
||
*
|
||
* await Flight.where("departure", "Dublin").update("departure", "Tokyo");
|
||
*
|
||
* await Flight.where("departure", "Dublin").update({ destination: "Tokyo" });
|
||
*/
|
||
static async update(fieldOrFields: string | Values, fieldValue?: FieldValue) {
|
||
let fieldsToUpdate: Values = {};
|
||
|
||
if (this.timestamps) {
|
||
fieldsToUpdate[
|
||
this.formatFieldToDatabase("updated_at") as string
|
||
] = new Date();
|
||
}
|
||
|
||
if (typeof fieldOrFields === "string") {
|
||
fieldsToUpdate[
|
||
this.formatFieldToDatabase(fieldOrFields) as string
|
||
] = fieldValue!;
|
||
} else {
|
||
fieldsToUpdate = {
|
||
...fieldsToUpdate,
|
||
...(this.formatFieldToDatabase(fieldOrFields) as {
|
||
[fieldName: string]: any;
|
||
}),
|
||
};
|
||
}
|
||
|
||
return this._runQuery(
|
||
this._currentQuery
|
||
.table(this.table)
|
||
.update(fieldsToUpdate)
|
||
.toDescription(),
|
||
) as Promise<Model[]>;
|
||
}
|
||
|
||
/** Delete a record by a primary key value.
|
||
*
|
||
* await Flight.deleteById("1");
|
||
*/
|
||
static async deleteById(id: FieldValue) {
|
||
return this._runQuery(
|
||
this._currentQuery
|
||
.table(this.table)
|
||
.where(this.getComputedPrimaryKey(), "=", id)
|
||
.delete()
|
||
.toDescription(),
|
||
);
|
||
}
|
||
|
||
/** Delete selected records.
|
||
*
|
||
* await Flight.where("destination", "Paris").delete();
|
||
*/
|
||
static async delete() {
|
||
return this._runQuery(
|
||
this._currentQuery.table(this.table).delete().toDescription(),
|
||
);
|
||
}
|
||
|
||
/** Join a table to the current query.
|
||
*
|
||
* await Flight.where(
|
||
* Flight.field("departure"),
|
||
* "Paris",
|
||
* ).join(
|
||
* Airport,
|
||
* Airport.field("id"),
|
||
* Flight.field("airportId"),
|
||
* ).get()
|
||
*/
|
||
static join<T extends ModelSchema>(
|
||
this: T,
|
||
joinTable: ModelSchema,
|
||
originField: string,
|
||
targetField: string,
|
||
) {
|
||
this._currentQuery.join(
|
||
joinTable.table,
|
||
joinTable.formatFieldToDatabase(originField) as string,
|
||
this.formatFieldToDatabase(targetField) as string,
|
||
);
|
||
return this;
|
||
}
|
||
|
||
/** Join a table with left outer statement to the current query.
|
||
*
|
||
* await Flight.where(
|
||
* Flight.field("departure"),
|
||
* "Paris",
|
||
* ).leftOuterJoin(
|
||
* Airport,
|
||
* Airport.field("id"),
|
||
* Flight.field("airportId"),
|
||
* ).get()
|
||
*/
|
||
static leftOuterJoin<T extends ModelSchema>(
|
||
this: T,
|
||
joinTable: ModelSchema,
|
||
originField: string,
|
||
targetField: string,
|
||
) {
|
||
this._currentQuery.leftOuterJoin(
|
||
joinTable.table,
|
||
joinTable.formatFieldToDatabase(originField) as string,
|
||
this.formatFieldToDatabase(targetField) as string,
|
||
);
|
||
return this;
|
||
}
|
||
|
||
/** Join a table with left statement to the current query.
|
||
*
|
||
* await Flight.where(
|
||
* Flight.field("departure"),
|
||
* "Paris",
|
||
* ).leftJoin(
|
||
* Airport,
|
||
* Airport.field("id"),
|
||
* Flight.field("airportId"),
|
||
* ).get()
|
||
*/
|
||
static leftJoin<T extends ModelSchema>(
|
||
this: T,
|
||
joinTable: ModelSchema,
|
||
originField: string,
|
||
targetField: string,
|
||
) {
|
||
this._currentQuery.leftJoin(
|
||
joinTable.table,
|
||
joinTable.formatFieldToDatabase(originField) as string,
|
||
this.formatFieldToDatabase(targetField) as string,
|
||
);
|
||
return this;
|
||
}
|
||
|
||
/** Count the number of records of a model or filtered by a field name.
|
||
*
|
||
* await Flight.count();
|
||
*
|
||
* await Flight.where("destination", "Dublin").count();
|
||
*/
|
||
static async count(field: string = "*") {
|
||
const value = await this._runQuery(
|
||
this._currentQuery
|
||
.table(this.table)
|
||
.count(this.formatFieldToDatabase(field) as string)
|
||
.toDescription(),
|
||
);
|
||
|
||
return (value as AggregationResult[])[0].count;
|
||
}
|
||
|
||
/** Find the minimum value of a field from all the selected records.
|
||
*
|
||
* await Flight.min("flightDuration");
|
||
*/
|
||
static async min(field: string) {
|
||
const value = await this._runQuery(
|
||
this._currentQuery
|
||
.table(this.table)
|
||
.min(this.formatFieldToDatabase(field) as string)
|
||
.toDescription(),
|
||
);
|
||
|
||
return (value as AggregationResult[])[0].min;
|
||
}
|
||
|
||
/** Find the maximum value of a field from all the selected records.
|
||
*
|
||
* await Flight.max("flightDuration");
|
||
*/
|
||
static async max(field: string) {
|
||
const value = await this._runQuery(
|
||
this._currentQuery
|
||
.table(this.table)
|
||
.max(this.formatFieldToDatabase(field) as string)
|
||
.toDescription(),
|
||
);
|
||
|
||
return (value as AggregationResult[])[0].max;
|
||
}
|
||
|
||
/** Compute the sum of a field's values from all the selected records.
|
||
*
|
||
* await Flight.sum("flightDuration");
|
||
*/
|
||
static async sum(field: string) {
|
||
const value = await this._runQuery(
|
||
this._currentQuery
|
||
.table(this.table)
|
||
.sum(this.formatFieldToDatabase(field) as string)
|
||
.toDescription(),
|
||
);
|
||
|
||
return (value as AggregationResult[])[0].sum;
|
||
}
|
||
|
||
/** Compute the average value of a field's values from all the selected records.
|
||
*
|
||
* await Flight.avg("flightDuration");
|
||
*
|
||
* await Flight.where("destination", "San Francisco").avg("flightDuration");
|
||
*/
|
||
static async avg(field: string) {
|
||
const value = await this._runQuery(
|
||
this._currentQuery
|
||
.table(this.table)
|
||
.avg(this.formatFieldToDatabase(field) as string)
|
||
.toDescription(),
|
||
);
|
||
|
||
return (value as AggregationResult[])[0].avg;
|
||
}
|
||
|
||
/** Find associated values for the given model for one-to-many and many-to-many relationships.
|
||
*
|
||
* class Airport {
|
||
* static flights() {
|
||
* return this.hasMany(Flight);
|
||
* }
|
||
* }
|
||
*
|
||
* Airport.where("id", "1").flights();
|
||
*/
|
||
static hasMany<T extends ModelSchema>(
|
||
this: T,
|
||
model: ModelSchema,
|
||
): Promise<Model | Model[]> {
|
||
const currentWhereValue = this._findCurrentQueryWhereClause();
|
||
|
||
if (model.name in this.pivot) {
|
||
const pivot = this.pivot[model.name];
|
||
const pivotField = this.formatFieldToDatabase(
|
||
pivot._pivotsFields[this.name],
|
||
) as string;
|
||
const pivotOtherModel = pivot._pivotsModels[model.name];
|
||
const pivotOtherModelField = pivotOtherModel.formatFieldToDatabase(
|
||
pivot._pivotsFields[model.name],
|
||
) as string;
|
||
|
||
return pivot
|
||
.where(pivot.field(pivotField), currentWhereValue)
|
||
.join(
|
||
pivotOtherModel,
|
||
pivotOtherModel.field(pivotOtherModel.getComputedPrimaryKey()),
|
||
pivot.field(pivotOtherModelField),
|
||
)
|
||
.get();
|
||
}
|
||
|
||
const foreignKeyName = this._findModelForeignKeyField(model);
|
||
this._currentQuery = this._queryBuilder.queryForSchema(this);
|
||
return model.where(foreignKeyName, currentWhereValue).all();
|
||
}
|
||
|
||
/** Find associated values for the given model for one-to-one and one-to-many relationships. */
|
||
static async hasOne<T extends ModelSchema>(this: T, model: ModelSchema) {
|
||
const currentWhereValue = this._findCurrentQueryWhereClause();
|
||
const FKName = this._findModelForeignKeyField(model);
|
||
|
||
if (!FKName) {
|
||
const currentModelFKName = this._findModelForeignKeyField(this, model);
|
||
const currentModelValue = await this.where(
|
||
this.getComputedPrimaryKey(),
|
||
currentWhereValue,
|
||
).first();
|
||
const currentModelFKValue =
|
||
currentModelValue[currentModelFKName] as FieldValue;
|
||
return model.where(model.getComputedPrimaryKey(), currentModelFKValue)
|
||
.first();
|
||
}
|
||
|
||
return model.where(FKName, currentWhereValue).first();
|
||
}
|
||
|
||
/** Look for the current query's where clause for this model's primary key. */
|
||
private static _findCurrentQueryWhereClause() {
|
||
if (!this._currentQuery._query.wheres) {
|
||
throw new Error("The current query does not have any where clause.");
|
||
}
|
||
|
||
const where = this._currentQuery._query.wheres.find((where) => {
|
||
return where.field === this.getComputedPrimaryKey();
|
||
});
|
||
|
||
if (!where) {
|
||
throw new Error(
|
||
"The current query does not have any where clause for this model primary key.",
|
||
);
|
||
}
|
||
|
||
return where.value;
|
||
}
|
||
|
||
/** Look for a `fieldName: Relationships.belongsTo(forModel)` field for a given `model`. */
|
||
private static _findModelForeignKeyField(
|
||
model: ModelSchema,
|
||
forModel: ModelSchema = this,
|
||
): string {
|
||
const modelFK: [string, FieldType] | undefined = Object.entries(
|
||
model.fields,
|
||
).find(([, type]) => {
|
||
return typeof type === "object"
|
||
? type.relationship?.model === forModel
|
||
: false;
|
||
});
|
||
|
||
if (!modelFK) {
|
||
return "";
|
||
}
|
||
|
||
return modelFK[0];
|
||
}
|
||
|
||
/** Return the instance current value for its primary key. */
|
||
private _getCurrentPrimaryKey() {
|
||
const model = this.constructor as ModelSchema;
|
||
return (this as any)[model.getComputedPrimaryKey()] as string;
|
||
}
|
||
|
||
/** Create a new record for the model.
|
||
*
|
||
* const flight = new Flight();
|
||
* flight.departure = "Toronto";
|
||
* flight.destination = "Paris";
|
||
* await flight.save();
|
||
*/
|
||
async save() {
|
||
const model = this.constructor as ModelSchema;
|
||
|
||
const values: Values = {};
|
||
for (const field of Object.keys(model.fields)) {
|
||
if (this.hasOwnProperty(field)) {
|
||
values[field] = (this as any)[field];
|
||
} else if (model.defaults.hasOwnProperty(field)) {
|
||
const defaultValue = model.defaults[field];
|
||
|
||
if (typeof defaultValue === "function") {
|
||
values[field] = defaultValue();
|
||
} else {
|
||
values[field] = defaultValue;
|
||
}
|
||
}
|
||
}
|
||
|
||
const createdInstance = await model.create(values);
|
||
|
||
for (const field in createdInstance) {
|
||
(this as any)[field] = (createdInstance as any)[field];
|
||
}
|
||
|
||
return this;
|
||
}
|
||
|
||
/** Update this record using its current field values.
|
||
*
|
||
* flight.destination = "London";
|
||
* await flight.update();
|
||
*/
|
||
async update() {
|
||
const model = this.constructor as ModelSchema;
|
||
const modelPK = model.getComputedPrimaryKey();
|
||
|
||
const values: Values = {};
|
||
for (const field of Object.keys(model.fields)) {
|
||
if (this.hasOwnProperty(field) && field !== modelPK) {
|
||
values[field] = (this as any)[field];
|
||
}
|
||
}
|
||
|
||
await model.where(modelPK, this._getCurrentPrimaryKey()).update(
|
||
values,
|
||
);
|
||
|
||
return this;
|
||
}
|
||
|
||
/** Delete this record from the database.
|
||
*
|
||
* await flight.delete();
|
||
*/
|
||
async delete() {
|
||
const model = this.constructor as ModelSchema;
|
||
const PKCurrentValue = this._getCurrentPrimaryKey();
|
||
|
||
if (PKCurrentValue === undefined) {
|
||
throw new Error(
|
||
"This instance does not have a value for its primary key. It cannot be deleted.",
|
||
);
|
||
}
|
||
|
||
return model.deleteById(PKCurrentValue);
|
||
}
|
||
}
|