Hello,

I have my cutom class A :

class SubstitutionPage(models.Model):
    _name = 'product.substitution'

    product = fields.Many2one('product.product', string='Nom du produit')
    barcode = fields.Char(string='Code barre')

    @api.onchange('product')
    def onchange_product(self):
        for i in self.env['product.template'].search([('id', '=', self.product.id)]):
            self.barcode = i.barcode

And my class B :

class ProductButton(models.Model):
 _inherit = 'product.template'

 @api.multi
 def substitution(self):
 subst_action = {
 'type': "ir.actions.act_window",
 'res_model': 'product.substitution',
 'view_type': "form",
 'view_mode': "tree",
 'target': 'view_substitution_tree',
 }
 return subst_action

Then the xml :

<record id="c2m_product_template" model="ir.ui.view">
    <field name="name">c2m.product.template</field>
    <field name="model">product.template</field>
    <field name = "view_mode">tree,form</field>
    <field name="inherit_id" ref="product.product_template_only_form_view"/>
    <field name="arch" type="xml">
        <xpath expr="//div[@name='button_box']" position="inside">
            <button name="substitution" class="oe_inline oe_stat_button"
                    type="object" style="background:rgba(46, 210, 162,0.2);"
                    string="Substitution" icon="fa-sitemap">
                <field string="Counter" name="counter" widget="statinfo" />
            </button>
        </xpath>
        <field name="name" position="after">
            <div>
                <field name="message_subst"/>
                <label for="message_subst"/>
            </div>
        </field>
    </field>
</record>

<!--Vue substitution-->
<!-- Tree -->
<record id="view_substitution_tree" model="ir.ui.view">
    <field name="name">app.substitution.product.substitution.tree</field>
    <field name="model">product.substitution</field>
    <field name="arch" type="xml">
        <tree string="Substitution" editable="bottom">
            <field name="product"/>
            <field name="barcode"/>
        </tree>
    </field>
</record>

So when I'm on the product page I've a button on the right corner (where you can see the sales, purchase, stocks ...) that send to my new custom page (Substitution).

On this new page I've a tree view where I can put values into

Problem is it's not linked to a product. I mean if I chose product 1 and then I go to the substitution page of this product and enter values, I would see them on product 2, 3, ...

I can even see on the top of the page that the breadcrulb is not set correctly.

Product/name of my product / nothing --> it should ben Product /name of my product/ substitution

Thx for you help.