var MapView = View.extend({
    template: 'MapView',
    className: 'o_map_view',
    view_type: 'map',
    display_name: _lt('Map'),
    icon: 'fa-map-o',
    searchable: true,
    init: function () {
        console.log(arguments);
        this._super.apply(this, arguments);
        this.markers = [];
        this.map = false;
        this.shown = $.Deferred();
        this.fields = this.fields_view.fields;
        this.children_field = this.fields_view.field_parent;
    },for example there are "arguments" and it has values in it. Where from it come?  how it is being generated?
Thanks