I'm trying to follow this video tutorial: http://www.odooclass.com/shop/product/mastering-odoo-9-development-6-intermediate-odoo-development-109

In my case I can't get the realeated field to work. In my case it always shows 0, no matter what I set in Products.

Here are my models:

class Dietfacts_product_template(models.Model):
    _name = 'product.template'
    _inherit = 'product.template'
    
    calories = fields.Integer('Calories')
    servingsize = fields.Float('Serving size')
    lastupdated = fields.Date('Last Updated')
    #dietitem = fields.Boolean('Diet item')
    
class Dietfacts_res_users_meal(models.Model):
    _name = 'res.users.meal'
    
    name = fields.Char('Meal name')
    meal_date = fields.Datetime('Meal Date')
    item_ids = fields.One2many('res.users.mealitem', 'meal_id')  
    user_id = fields.Many2one('res.users','Meal User')
    notes = fields.Text('Meal notes')
    
class Dietfacts_res_users_mealitem(models.Model):
    _name = 'res.users.mealitem'
    
    meal_id = fields.Many2one('res.users.meal', 'Meal')
    item_id = fields.Many2one('product.template', 'Item')
    servings = fields.Float('Servings')
    calories = fields.Integer(releated='item_id.calories', string='Calories per serving', store=True, readonly=True)
    notes = fields.Text('Meal item notes')

And my xml view:

<menuitem action="meal_action_dietfacts" id="menu_meal_action_dietfacts" parent="base.menu_sales" sequence="15" />
<record id="dietfacts_meal_form_view" model="ir.ui.view">
    <field name="model">res.users.meal</field>
    <field name="view_type">form</field>
    <field name="arch" type="xml">
        <form>
            <group>
                <field name="name"></field>
                <field name="meal_date"></field>
                <field name="user_id"></field>
                <field name="notes"></field>
            </group>
            <notebook>
                <page name="mealitems" string="Meal Items">
                    <field name="item_ids" widget="one2many_list">
                        <tree string="Meal Items" editable="bottom">
                            <field name="item_id" />
                            <field name="calories" />
                            <field name="servings" />
                            <field name="notes" />
                        </tree>
                    </field>
                </page>
            </notebook>
        </form>
    </field>
</record>

Btw, this forum is terrible for pasting code.