Add method to group by order in invoice report

Move invoice class in dedicated file

sale_usability/account_invoice.py

@@ -0,0 +1,90 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2015-2018 Akretion (http://www.akretion.com)
+# @author Alexis de Lattre <alexis.delattre@akretion.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import models
+
+
+class AccountInvoice(models.Model):
+    _inherit = 'account.invoice'
+
+    # for report (located in sale_usability and not account_usability
+    # because it uses layout categ defined in sale
+    # Method used in the sample invoice report available here:
+    # https://github.com/akretion/odoo-py3o-report-templates/tree/10.0/account_invoice_report_py3o
+    def py3o_lines_layout(self):
+        self.ensure_one()
+        res1 = {}
+        #    {'categ(6)': {'lines': [l1, l2], 'subtotal': 23.32}}
+        for line in self.invoice_line_ids:
+            categ = line.layout_category_id
+            if categ in res1:
+                res1[categ]['lines'].append(line)
+                res1[categ]['subtotal'] += line.price_subtotal
+            else:
+                res1[categ] = {
+                    'lines': [line],
+                    'subtotal': line.price_subtotal}
+        res2 = []
+        if len(res1) == 1 and not res1.keys()[0]:
+            # No category at all
+            for line in res1.values()[0]['lines']:
+                res2.append({'line': line})
+        else:
+            for categ, ldict in res1.iteritems():
+                res2.append({'categ': categ})
+                for line in ldict['lines']:
+                    res2.append({'line': line})
+                if categ.subtotal:
+                    res2.append({'subtotal': ldict['subtotal']})
+        # res2:
+        # [
+        #    {'categ': categ(1)},
+        #    {'line': invoice_line(2)},
+        #    {'line': invoice_line(3)},
+        #    {'subtotal': 8932.23},
+        # ]
+        return res2
+
+    def py3o_lines_layout_groupby_order(self, subtotal=True):
+        # This method is an alternative to the method py3o_lines_layout()
+        # defined above: you just have to change the call in the invoice
+        # ODT template
+        self.ensure_one()
+        res1 = {}
+        # {categ(1): {'lines': [l1, l2], 'subtotal': 23.32}}
+        soo = self.env['sale.order']
+        for line in self.invoice_line_ids:
+            order = line.sale_line_ids and line.sale_line_ids[0].order_id\
+                or soo
+            if order in res1:
+                res1[order]['lines'].append(line)
+                res1[order]['subtotal'] += line.price_subtotal
+            else:
+                res1[order] = {
+                    'lines': [line],
+                    'subtotal': line.price_subtotal}
+        # from pprint import pprint
+        # pprint(res1)
+        res2 = []
+        if len(res1) == 1 and not res1.keys()[0]:
+            # No order at all
+            for line in res1.values()[0]['lines']:
+                res2.append({'line': line})
+        else:
+            for order, ldict in res1.iteritems():
+                res2.append({'categ': order})
+                for line in ldict['lines']:
+                    res2.append({'line': line})
+                if subtotal:
+                    res2.append({'subtotal': ldict['subtotal']})
+        # res2:
+        # [
+        #    {'categ': categ(1)},
+        #    {'line': invoice_line(2)},
+        #    {'line': invoice_line(3)},
+        #    {'subtotal': 8932.23},
+        # ]
+        # pprint(res2)
+        return res2