data-model-view.js

// MOST Web Framework 2.0 Codename Blueshift BSD-3-Clause license Copyright (c) 2017-2022, THEMOST LP All rights reserved
var _ = require('lodash');
var {DataField} = require('./types');

/**
 * @class DataModelView
 * @property {string} title - Gets or sets the title of the current view
 * @property {string} name - Gets or sets the name of the current data view
 * @property {boolean} public - Gets or sets a boolean that indicates whether this data view is public or not.The default value is true.
 * @property {boolean} sealed - Gets or sets a boolean that indicates whether this data view is sealed or not. The default value is true.
 * @property {string|QueryExpression|*} filter - Gets or sets an open data formatted filter string or a query expression object associated with this view.
 * @property {string|*} order - Gets or sets an open data formatted order string or an order expression object associated with this view.
 * @property {string|*} group - Gets or sets an open data formatted group string or a group expression object associated with this view.
 * @property {Array} fields - Gets or sets the collection of data view's fields
 * @property {DataModel} model - Gets a DataModel instance that represents the parent model of the current view
 * @property {Array} attributes - A readonly collection of DataField instances
 * @param {DataModel} model - The parent model associated with this view
 * @constructor
 */
function DataModelView(model) {

    this.public = true;
    this.sealed = true;
    this.fields = [];
    var _model = model;
    Object.defineProperty(this,'model', {
        get: function() {
            return _model;
        }, configurable:false, enumerable: false
    });
    var self = this;
    Object.defineProperty(this,'attributes', {
        get: function() {
            var attrs = [];
            self.fields.forEach(function(x) {
                if (self.model) {
                    var field = _.assign(new DataField(), self.model.field(x.name));
                    if (field)
                        attrs.push(_.assign(field, x));
                    else
                        attrs.push(_.assign({}, x));
                }
                else
                //unbound view (?)
                    attrs.push(_.assign({}, x));

            });
            return attrs;
        }, configurable:false, enumerable: false
    });
}
/**
 * Casts an object or an array of objects based on view's field collection.
 * @param {Array|*} obj
 * @returns {Array|*}
 */
DataModelView.prototype.cast = function(obj) {
    var self = this, res;
    var localFields = this.fields.filter(function(y) {
        return !_.isNil(self.model.field(y.name));
    });
    if (_.isArray(obj)) {
        var arr = [];
        obj.forEach(function(x) {
            res = {};
            localFields.forEach(function(y) {
                if (typeof x[y.name] !== 'undefined')
                    res[y.name] = x[y.name];
            });
            arr.push(res);
        });
        return arr;
    }
    else {
        res = { };
        localFields.forEach(function(y) {
            if (typeof obj[y.name] !== 'undefined')
                res[y.name] = obj[y.name];
        });
        return res;
    }
};

module.exports = {
    DataModelView
}