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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 | 6x 93x 93x 6x 45x 6x 80x 6x 36x 6x 14x 14x 1x 13x 13x 13x 6x 1x 1x 1x 1x 1x 1x 6x 22x 22x 22x 22x 22x 22x 6x 27x 18x 18x 18x 18x 18x 18x 17x 17x 6x 1x 1x 1x 1x 6x 3x 6x | import {Base} from "./base";
import {query} from "./query.builder";
import {NotSavedModelError} from "./exceptions";
export abstract class Model extends Base {
[otherProps: string]: any;
constructor(props?: Model | {}) {
super();
Object.assign(this, props);
}
/**
* Factory for model instance creation
* @param {Object} pojo (plain old javascript object)
* @param {any} modelClass
* @returns {Model}
*/
public static create(pojo: Object, modelClass: any): Model {
return new modelClass(pojo);
}
public isSaved(): boolean {
return this.id !== undefined;
}
private getForeignKeyColumnName(): string {
return this.constructor.name.toLowerCase() + '_id';
}
//todo: parametro para opcion escribir el modelo en la tabla de la bd {save: true}
public belongsTo(model: Model): Model {
Iif ( !model.isSaved ) {
throw new Error('Invalid model instance: ' + model);
}
if( !model.isSaved() ) {
throw new NotSavedModelError(model, this);
}
const foreignColumnName = model.getForeignKeyColumnName();
this[foreignColumnName] = model.id;
return this;
}
//todo: esto corresponde a la direccion inversa de una relacion. Igual se podria implementar como un decorator
//igual que getChildren(). el decorador tendria que crear la fn hasMany() y getParent() o getChildren()
//dependiendo de lado de la relacion (consultar typeorm para ver como lo hace)
public getParent(model: any & Model): Model[] {
Iif( !this.isSaved() ) {
throw new NotSavedModelError(this, model);
}
const relatedTable = model.prototype.tableName();
const fkColumnName = model.prototype.getForeignKeyColumnName();
const idColValue = this[fkColumnName];
const relatedModels: Model[] = query(relatedTable).where('id', idColValue).run();
return relatedModels.map( obj => Model.create(obj, model) );
}
//todo: intentar crear dinamicamente esta funcion como "posts()" por ejemplo
/**
* Get first level related children models
* @param model
* @returns {Model[]}
*/
public getChildren(model: any & Model): Model[] {
Iif( !this.isSaved() ) {
throw new NotSavedModelError(this, model);
}
const childTable = model.prototype.tableName();
const fkColumnChildTable = this.getForeignKeyColumnName();
try {
const relatedModels: Model[] = query(childTable).where(fkColumnChildTable, this.id).run();
return relatedModels.map( obj => Model.create(obj, model) );
} catch(exception) {
console.error(`Model ${JSON.stringify(this)} has no children of type "${model.name}"`);
console.error(exception);
return [];
}
}
/**
* Get recursively all descendant models from this model
*/
public getChildrenAll(): void {
if (this.hasMany) {
const childClasses = this.hasMany();
for (let i = 0; i < childClasses.length; i++ ) {
const childModels = this.getChildren(childClasses[i]);
const newPropName = childClasses[i].prototype.tableName();
this[newPropName] = [];
for (let j = 0; j < childModels.length; j++ ) {
this[newPropName].push(childModels[j]);
childModels[j].getChildrenAll(); // recursive call
}
}
}
}
//todo: testar esta fn
/**
* Makes related models properties not enumerable
* Use: if a model is fetched with all related (or children) models
* when this model is saved an error is thrown due to properties containing related models
* are not original model properties
* This function can be used to "hide" (not enumerate) these props and save the model
* @param {Model} model
* returns {Model}
*/
public static omitChildrenProps(model: any): Model {
model.hasChildren() && model.hasMany().forEach((relatedModel: Model) => {
try {
Object.defineProperty(model, relatedModel.prototype.tableName(), {enumerable: false});
} catch(exception) {
console.error(exception);
alert(exception)
}
});
return model;
}
public hasChildren(): boolean {
return this.hasMany !== undefined;
}
// private isChildModel(): boolean {
// const columns: Column[] = this.__proto__.constructor.columns;
// let result = false;
// for (let i = 0; i < columns.length; i++) {
// if ( columns[i].isForeignKey() ) {
// result = true;
// break;
// }
// }
// return result;
// }
//
// public existsTableInDB(): boolean {
// const rows = db.exec( query.schema.hasTable(this.tableName()).toString() );
// return rows && rows.length > 0
// }
// public existsInTable() {
// return db.execQuery(`select * from ${this.tableName()} where id=${this.id}`);
// }
// private hasTableColumn(model: Model, columnName: string): boolean {
// const columns = model.columns;
// const columnNames: string[] = columns.map((column: Column) => {
// return column.name;
// });
// return columnNames.indexOf(columnName) > -1;
// }
// public setRelated(model: Model): number | string {
// let foreignId: number | string;
// try {
// if(this.id) {
// foreignId = this.id;
// } else {
// foreignId = this.save();
// }
// const foreignColumnName = this.getForeignKeyColumnName();
// model[foreignColumnName] = foreignId;
// return model.save();
// } catch(error) {
// console.log(error);
// return -1;
// }
// }
}
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