Improve UI, allowing user to measure the catch weight in a specific unit of measure.

This UOM should be convertable (in the same category) as the normal stock UOM for the product.
Example: If you want to sell 'units' of 50lbs then you should make a "50lbs" UOM in the Weight category and use that as the sale and purchase UOM, then your "Catch Weight UOM" can be the stock "lb(s)" UOM.

product_catch_weight/models/__init__.py

@@ -1,3 +1,4 @@
 from . import account_invoice
+from . import product
 from . import stock_patch
 from . import stock

product_catch_weight/models/account_invoice.py

@@ -7,6 +7,9 @@ _logger = logging.getLogger(__name__)
 class AccountInvoiceLine(models.Model):
     _inherit = 'account.invoice.line'
 
+    catch_weight = fields.Float(string='Catch Weight', digits=(10, 4), compute='_compute_price', store=True)
+    catch_weight_uom_id = fields.Many2one('product.uom', related='product_id.catch_weight_uom_id')
+
     @api.one
     @api.depends('price_unit', 'discount', 'invoice_line_tax_ids', 'quantity',
                  'product_id', 'invoice_id.partner_id', 'invoice_id.currency_id', 'invoice_id.company_id',
@@ -17,6 +20,7 @@ class AccountInvoiceLine(models.Model):
 
         ratio = 1.0
         qty_done_total = 0.0
+        catch_weight = 0.0
         if self.invoice_id.type in ('out_invoice', 'out_refund'):
             move_lines = self.sale_line_ids.mapped('move_ids.move_line_ids')
         else:
@@ -26,7 +30,9 @@ class AccountInvoiceLine(models.Model):
             r = move_line.lot_id.catch_weight_ratio
             ratio = ((ratio * qty_done_total) + (qty_done * r)) / (qty_done + qty_done_total)
             qty_done_total += qty_done
+            catch_weight += move_line.lot_id.catch_weight
         price = price * ratio
+        self.catch_weight = catch_weight
 
         taxes = False
         if self.invoice_line_tax_ids:

product_catch_weight/models/product.py

@@ -0,0 +1,7 @@
+from odoo import api, fields, models
+
+
+class ProductProduct(models.Model):
+    _inherit = 'product.template'
+
+    catch_weight_uom_id = fields.Many2one('product.uom', string='Catch Weight UOM')

product_catch_weight/models/stock.py

@@ -4,17 +4,43 @@ from odoo import api, fields, models
 class StockProductionLot(models.Model):
     _inherit = 'stock.production.lot'
 
-    catch_weight_ratio = fields.Float(string='Catch Weight Ratio', digits=(10, 6), default=1.0)
+    catch_weight_ratio = fields.Float(string='Catch Weight Ratio', digits=(10, 6), compute='_compute_catch_weight_ratio')
+    catch_weight = fields.Float(string='Catch Weight', digits=(10, 4))
+    catch_weight_uom_id = fields.Many2one('product.uom', related='product_id.catch_weight_uom_id')
+
+
+    @api.depends('catch_weight')
+    def _compute_catch_weight_ratio(self):
+        for lot in self:
+            if not lot.catch_weight_uom_id:
+                lot.catch_weight_ratio = 1.0
+            else:
+                lot.catch_weight_ratio = lot.catch_weight_uom_id._compute_quantity(lot.catch_weight,
+                                                                                   lot.product_id.uom_id,
+                                                                                   rounding_method='DOWN')
+
+
+class StockMove(models.Model):
+    _inherit = 'stock.move'
+
+    product_catch_weight_uom_id = fields.Many2one('product.uom', related="product_id.catch_weight_uom_id")
+
+    def _prepare_move_line_vals(self, quantity=None, reserved_quant=None):
+        vals = super(StockMove, self)._prepare_move_line_vals(quantity=quantity, reserved_quant=reserved_quant)
+        vals['catch_weight_uom_id'] = self.product_catch_weight_uom_id.id if self.product_catch_weight_uom_id else False
+        return vals
+
+    def action_show_details(self):
+        action = super(StockMove, self).action_show_details()
+        action['context']['show_catch_weight'] = bool(self.product_id.catch_weight_uom_id)
+        return action
 
 
 class StockMoveLine(models.Model):
     _inherit = 'stock.move.line'
 
-    lot_catch_weight_ratio = fields.Float(string='Catch Weight Ratio', digits=(10, 6), default=1.0)
-    lot_catch_weight_ratio_related = fields.Float(related='lot_id.catch_weight_ratio')
-    #lot_catch_weight_ratio = fields.Float(related='lot_id.catch_weight_ratio')
-
-    # def _action_done(self):
-    #     super(StockMoveLine, self)._action_done()
-    #     for ml in self.filtered(lambda l: l.product_id.tracking == 'serial' and l.lot_id):
-    #         ml.lot_id.catch_weight_ratio = ml.lot_catch_weight_ratio
+    catch_weight_ratio = fields.Float(string='Catch Weight Ratio', digits=(10, 6), default=1.0)
+    catch_weight = fields.Float(string='Catch Weight', digits=(10,4))
+    catch_weight_uom_id = fields.Many2one('product.uom', string='Catch Weight UOM')
+    lot_catch_weight = fields.Float(related='lot_id.catch_weight')
+    lot_catch_weight_uom_id = fields.Many2one('product.uom', related='product_id.catch_weight_uom_id')

product_catch_weight/models/stock_patch.py

@@ -41,8 +41,9 @@ def _action_done(self):
                         # the fly before assigning it to the move line if the user checked both
                         # `use_create_lots` and `use_existing_lots`.
                         if ml.lot_name and not ml.lot_id:
+                            lot_catch_weight = ml.catch_weight_uom_id._compute_quantity(ml.catch_weight, ml.product_id.catch_weight_uom_id, rounding_method='DOWN')
                             lot = self.env['stock.production.lot'].create(
-                                {'name': ml.lot_name, 'product_id': ml.product_id.id, 'catch_weight_ratio': ml.lot_catch_weight_ratio}
+                                {'name': ml.lot_name, 'product_id': ml.product_id.id, 'catch_weight': lot_catch_weight}
                             )
                             ml.write({'lot_id': lot.id})
                     elif not picking_type_id.use_create_lots and not picking_type_id.use_existing_lots: