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//todo: hacer fn para paginacion. params: limit (rows per page), offset: (num. pag)
//getAllPaginated(pagNum, recordNum)
//todo: probar en edge y explorer
//todo: hacer mutators transaccionales o averiguar si por defecto sqlite hace las operaciones transaccionales
//todo: no usar cadena literal para nombre de columna 'id'
//todo: faltan relaciones "one to one" y "many to many"
//todo: documentar funciones
//todo: fn borrar tabla
//todo: implementar logger usando decorators
import {db} from "./database";
import {query} from "./query.builder";
import {Column} from "./column";
import {Base} from "./base";
import {Model} from "./model";
import {TableBuilder} from "knex";
import {DBtype} from "./types";
/**
* Manages a collection of models (rows in a db table)
* It follows Repository pattern
*/
export class Collection extends Base {
constructor(protected model: any) {
super();
if (this.hasRelations()) {
this.createRelations();
}
this.createTable(this.tableName(), model.columns);
}
private createTable(tableName: string, columns: Column[]): void {
const createTableQuery = query.schema.raw('PRAGMA foreign_keys=ON')
.dropTableIfExists(tableName).createTable(
tableName, (tableBuilder: TableBuilder) => {
this.createColumns(columns, tableBuilder)
});
db.runQuery(createTableQuery);
}
//todo: hacer static
private createColumns(columns: Column[], tableBuilder: TableBuilder): void {
tableBuilder.increments('id');
for (let i in columns) {
columns[i].createColumn(tableBuilder);
}
}
/**
* Given an array of pojos it returns an array of model instances
* @param {Object[]} pojos (Plain Old Javascript Object)
* @returns {Object[]}
*/
public createModelInstances(pojos: Object[]): Model[] {
for (let i = 0; i < pojos.length; i++) {
pojos[i] = Model.create(pojos[i], this.model);
}
return pojos as Model[];
}
public getAll( load: {children: boolean} = {children: false} ): Model[] {
const result = db.execQuery(`select * from ${this.tableName()}`);
const models: Model[] = this.createModelInstances(result);
console.table && console.table(result);
if (load.children) {
models.forEach( (model: Model) => model.getChildrenAll() );
return models;
} else {
return this.createModelInstances(result);
}
}
public getById( id: string | number, load: {children: boolean} = {children: false} ): Model {
const result = db.execQuery(`select * from ${this.tableName()} where id=${id}`)[0];
const model = new this.model(result);
console.log(model);
if (load.children) {
model.getChildrenAll();
}
return model;
}
public getByFilter(filter: Object,
columns: string[]=[],
load: {children: boolean} = {children: false} ): Model[] {
const result = query.select(columns).from(this.tableName()).where(filter).run();
console.table && console.table(result);
if (load.children) {
const models: Model[] = this.createModelInstances(result);
models.forEach( (model: Model) => model.getChildrenAll() );
return models;
} else {
return this.createModelInstances(result);
}
}
public getByOperator(termA: any,
operator: string,
termB: any,
columns: string[] = [],
load: {children: boolean} = {children: false}): Model[] {
const result = query.select(columns).from(this.tableName()).where(termA, operator, termB).run();
console.table && console.table(result);
if (load.children) {
const models: Model[] = this.createModelInstances(result);
models.forEach( (model: Model) => model.getChildrenAll() );
return models;
} else {
return this.createModelInstances(result);
}
}
private hasRelations(): boolean {
return this.model.prototype.hasMany
}
private createColumnRelation(index: number): void {
const model = this.model;
const relatedModel = model.prototype.hasMany()[index];
const newColumnRelation = new Column({
name: model.name.toLowerCase() + '_id',
dbType: DBtype.INTEGER,
foreignKey: true,
relatedTable: model.name.toLowerCase() + 's',
notNullable: true
});
const logFormat = 'color: grey; border-color: lightgrey; border-style: solid; border-width: 1px; ' +
'border-radius: 2px; padding: 2px; background-color: #f0f0f5';
console.log(`%c ⚿ Foreign-key column created in table ${relatedModel.prototype.tableName()}↴ `, logFormat);
console.log(newColumnRelation);
const relatedModelColumns = relatedModel.prototype.constructor.columns;
relatedModelColumns.push(newColumnRelation);
}
private createRelations(): void {
const relationsList: Model[] = this.model.prototype.hasMany();
for(let index = 0; index < relationsList.length; index++) {
this.createColumnRelation(index);
}
}
/**
* Get table structure and metadata for a model
* @param modelClass
* @returns {Object[]} Column metadata
*/
public static getTableSchema(modelClass: any): Object[] {
return db.execQuery( `PRAGMA table_info(${modelClass.prototype.tableName()})` );
}
/**
* Get Knex query-builder for this collection/table
* @returns {any}
*/
public query(): any {
return query(this.tableName());
}
/**
* Returns table schema with column metadata
* @param {string} tableName
* @param {string} columnName
* @returns {boolean}
*/
public static hasColumn(tableName: string, columnName: string): boolean {
const results = db.exec(`SELECT COUNT(*) AS MATCHED_COLUMNS
FROM pragma_table_info('${tableName}') WHERE name='${columnName}'`);
return results[0].values[0][0] > 0;
}
/**
* For posible future use
* Deletes the table corresponding to the collection
* @param {"string"} tableName
*/
public static deleteTable(tableName: string): void {
db.runQuery( query.schema.dropTableIfExists(tableName) );
}
} |