odoo 分组视图下显示同一批次记录的总数

<?xml version="1.0" encoding="utf-8"?>
<!-- vim:fdn=3:
-->
<openerp>
    <data>
        <template id="assets_backend" name="rhwl_gene_inherit assets" inherit_id="web.assets_backend">
            <xpath expr="." position="inside">
                <script type="text/javascript" src="/rhwl_gene_inherit/static/js/rhwl_gene_inherit.js"></script>
            </xpath>
        </template>
    </data>
</openerp>

openerp.rhwl_gene_inherit = function (instance) {
    var _t = instance.web._t,
        _lt = instance.web._lt;
    var QWeb = instance.web.qweb;

    instance.web.rhwl_gene_inherit = instance.web.rhwl_gene_inherit || {};

    instance.web.rhwl_gene_inherit.SearchView = instance.web.ListView.Groups.extend({
        init: function (view, options) {
            this._super.apply(this, arguments);
            // all_batch_str ：全局变量用于保存批次名和该批次对应的数量
            this.all_batch_str = {};
            var self = this;
            var Mod = new instance.web.Model(‘rhwl.easy.genes.new‘);
            Mod.call("get_all_batch_num").then(function(all_batch_num) {
                        self.all_batch_str = all_batch_num;
                    });
        },

        render_groups: function (datagroups) {
            var self = this;
            for ( var i = 0; i <  datagroups.length; i++) {
                if (datagroups[i].grouped_on === "batch_no"){
                    var batch_no_name = datagroups[i].value;
                    var current_num = datagroups[i].length;
                    for (batch_str in self.all_batch_str) {
                        if (batch_str === batch_no_name){
                            datagroups[i].length = current_num+"/"+self.all_batch_str[batch_str];
                        }
                    }
                }
            }
            placeholder = this._super.apply(this, arguments);
            return placeholder;
        }
     });

    instance.web.views.add(‘rhwl_gene_inherit_ListView‘, ‘instance.web.rhwl_gene_inherit.ListView‘);
    instance.web.rhwl_gene_inherit.ListView = instance.web.ListView.extend({
         init: function (parent, dataset, view_id, options) {
             this._super(parent, dataset, view_id, _.extend(options || {}, {
                GroupsType: instance.web.rhwl_gene_inherit.SearchView
             }));
         }
    });
};

    def get_all_batch_num(self, cr, uid, context=None):
        res = {}
        sql_str = "SELECT batch_no, count(*) as batch_count from rhwl_easy_genes_new WHERE  batch_no is not NULL GROUP BY batch_no "
        cr.execute(sql_str)
        for i in cr.fetchall():
            res.update({i[0]: i[1]})
        return res