blow-data/lib/ModelRelationMetadata.js

Data access layer for Blow.

'use strict';
const util_1 = require('util');
const rxjs_1 = require('rxjs');
const blow_query_1 = require('blow-query');
const _ = require('./helpers');
class ModelRelationMetadata {
    constructor(options) {
        this._name = options.name;
        this._type = options.type;
        this._model = options.model;
        this._foreignKey = options.foreignKey;
        this._hidden = util_1.isUndefined(options.hidden) ? false : options.hidden;
    }
    get name() {
        return this._name;
    }
    get type() {
        return this._type;
    }
    get model() {
        return this._model;
    }
    get foreignKey() {
        return this._foreignKey;
    }
    get hidden() {
        return this._hidden;
    }
    apply(model) {
        switch (this.type) {
            case 'belongsTo':
                {
                    const relationName = this.name;
                    const targetModel = (_.getModel(this.model));
                    const targetKey = _.getModel(this.model).metadata.idProperty;
                    if (!model.metadata.hasProperty(this.foreignKey)) {
                        model.metadata.defineProperty({
                            name: this.foreignKey,
                            type: targetKey.type
                        });
                    }
                    const rootModel = model;
                    const rootKey = model.metadata.getProperty(this.foreignKey);
                    Object.defineProperty(model.prototype, relationName, {
                        enumerable: false,
                        configurable: false,
                        get: function () {
                            const inst = this;
                            return function (data) {
                                if (arguments.length > 0) {
                                    inst[rootKey.name] = data[targetKey.name];
                                }
                                else {
                                    if (inst[rootKey.name]) {
                                        return targetModel.findById(inst[rootKey.name]);
                                    }
                                    else {
                                        return rxjs_1.Observable.of(undefined);
                                    }
                                }
                            };
                        }
                    });
                }
                break;
            case 'hasMany':
                {
                    const relationName = this.name;
                    const rootModel = model;
                    const rootKey = model.metadata.idProperty;
                    const targetMetadata = _.getModel(this.model).metadata;
                    if (!targetMetadata.hasProperty(this.foreignKey)) {
                        targetMetadata.defineProperty({
                            name: this.foreignKey,
                            type: rootKey.type
                        });
                    }
                    const targetModel = (_.getModel(this.model));
                    const targetKey = targetMetadata.getProperty(this.foreignKey);
                    Object.defineProperty(model.prototype, relationName, {
                        enumerable: false,
                        configurable: false,
                        get: function () {
                            const inst = this;
                            return {
                                create(data) {
                                    data[targetKey.name] = inst[rootKey.name];
                                    return targetModel.create(data);
                                },
                                find(query) {
                                    const q = new blow_query_1.Query(query);
                                    q.equal(targetKey.name, inst[rootKey.name]);
                                    return targetModel.find(q);
                                },
                                findById(id) {
                                    const q = new blow_query_1.Query();
                                    q.equal(targetKey.name, inst[rootKey.name]);
                                    q.equal(targetModel.metadata.idProperty.name, id);
                                    return targetModel.findOne(q);
                                },
                                destroy(query) {
                                    const q = new blow_query_1.Query({ where: query });
                                    q.equal(targetKey.name, inst[rootKey.name]);
                                    return targetModel.destroy(q.toJSON().where);
                                },
                                destroyById(id) {
                                    const q = new blow_query_1.Query();
                                    q.equal(targetModel.metadata.idProperty.name, id);
                                    return this.destroy(q.toJSON().where);
                                }
                            };
                        }
                    });
                }
                break;
        }
    }
}
exports.ModelRelationMetadata = ModelRelationMetadata;