subscription_oca: Open subscription button on invoice

subscription_oca/__manifest__.py

@@ -12,6 +12,7 @@
     "depends": ["sale_management", "account"],
     "data": [
         "views/product_template_views.xml",
+        "views/account_move_views.xml",
         "views/sale_subscription_views.xml",
         "views/sale_subscription_stage_views.xml",
         "views/sale_subscription_tag_views.xml",

subscription_oca/models/account_move.py

@@ -10,3 +10,10 @@ class AccountMove(models.Model):
     subscription_id = fields.Many2one(
         comodel_name="sale.subscription", string="Subscription"
     )
+
+    def action_open_subscription(self):
+        self.ensure_one()
+        action = self.env.ref("subscription_oca.sale_subscription_action")
+        action = action.read()[0]
+        action["domain"] = [("id", "=", self.subscription_id.id)]
+        return action

subscription_oca/views/account_move_views.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" ?>
+<odoo>
+    <record id="view_move_form" model="ir.ui.view">
+        <field name="model">account.move</field>
+        <field name="inherit_id" ref="account.view_move_form"/>
+        <field name="arch" type="xml">
+            <xpath expr="//div[@name='button_box']" position="inside">
+                <field name="subscription_id" invisible="1" />
+                <button name="action_open_subscription" type="object"
+                        class="oe_stat_button" icon="fa-calendar"
+                        string="Subscription"
+                        attrs="{'invisible': [('subscription_id', '=', False)]}" />
+            </xpath>
+        </field>
+    </record>
+</odoo>