从MySQL表获取数据

How I can display category name?

I have two tables, prod and category and now i want to make a join between this table to display for fetch prod your's category. When i add a now product, i specific category id.

Here another information

Prods.belongsTo(Categs, {foreignKey: 'categ_id', targetKey: 'id'}) ,

Prods and Categs are two model make with sequelize.

Prods att: id, name, category_id;

Categs att: id, name;

In prods.js i have :

function save() {
    var form = $('#re_form').serializeObject();
    if(form.id) {
        update(form);
    } else {
        create(form);
    }
}

function create(form) {
    $.ajax({
        url: '/prods/',
        type: 'POST',
        accepts: {
            json: 'application/json'
        },
        data: form,
        success: function(data) {
            var row = '<tr id="row_id_'+ data.id +'">'
                + getColumns(data)
                + '</tr>';
            $('#ar').append(row);
        } 
    });
}

function getColumns(value) {
    return '<td>'+value.id+'</td>'
        + '<td class="name">'+value.categ.name+'</td>'
        + '<td class="name">'+value.name+'</td>'
}

In HTML :

<div>
<label for="name">id Categ</label>
<input type="text" name="categ_id" id="categ_id" class="form-control"/>
</div>

Error: Uncaught Type Error: Cannot read property 'name' of undefined for category name