[IMP] account: Allow to merge and print original vendor bills

This commit add an action to merge and print the original vendor bills
through the field 'message_main_attachment_id'.

Was task 2006908

closes odoo/odoo#34023

Signed-off-by: Quentin De Paoli (qdp) <qdp@openerp.com>

addons/account/models/__init__.py

@@ -21,3 +21,4 @@ from . import reconciliation_widget
 from . import account_incoterms
 from . import digest
 from . import res_users
+from . import ir_actions_report

addons/account/models/ir_actions_report.py

@@ -0,0 +1,33 @@
+# -*- coding: utf-8 -*-
+
+from odoo import models, api, _
+from odoo.exceptions import UserError
+
+class IrActionsReport(models.Model):
+    _inherit = 'ir.actions.report'
+
+    @api.multi
+    def retrieve_attachment(self, record):
+        # get the original bills through the message_main_attachment_id field of the record
+        if self.report_name == 'account.report_original_vendor_bill' and record.message_main_attachment_id:
+            if record.message_main_attachment_id.mimetype == 'application/pdf' or \
+               record.message_main_attachment_id.mimetype.startswith('image'):
+                return record.message_main_attachment_id
+        return super(IrActionsReport, self).retrieve_attachment(record)
+
+    @api.multi
+    def _post_pdf(self, save_in_attachment, pdf_content=None, res_ids=None):
+        # don't include the generated dummy report
+        if self.report_name == 'account.report_original_vendor_bill':
+            pdf_content = None
+            res_ids = None
+            if not save_in_attachment:
+                raise UserError(_("No original vendor bills could be found for any of the selected vendor bills."))
+        return super(IrActionsReport, self)._post_pdf(save_in_attachment, pdf_content=pdf_content, res_ids=res_ids)
+
+    @api.multi
+    def postprocess_pdf_report(self, record, buffer):
+        # don't save the 'account.report_original_vendor_bill' report as it's just a mean to print existing attachments
+        if self.report_name == 'account.report_original_vendor_bill':
+            return None
+        return super(IrActionsReport, self).postprocess_pdf_report(record, buffer)

addons/account/views/account_report.xml

@@ -14,6 +14,17 @@
             groups="account.group_account_invoice"
         />
 
+        <report
+            id="action_account_original_vendor_bill"
+            model="account.move"
+            string="Original vendor bills"
+            report_type="qweb-pdf"
+            name="account.report_original_vendor_bill"
+            file="account.report_original_vendor_bill"
+            attachment="'original_vendor_bill.pdf'"
+            attachment_use="True"
+        />
+
         <report
             id="account_invoices_without_payment"
             model="account.move"

addons/account/views/report_invoice.xml

@@ -230,5 +230,16 @@
                 </t>
             </t>
         </template>
+
+        <!--We need to create the following empty report template for the action report
+            "action_account_original_vendor_bill" to work. The action is merging the
+            original vendor bill(s) that were used to create the vendor bill(s) into one PDF. -->
+        <template id="report_original_vendor_bill">
+            <t t-call="web.html_container">
+                <t t-foreach="docs" t-as="o">
+                    <div class="article"  t-att-data-oe-model="o and o._name" t-att-data-oe-id="o and o.id" t-att-data-oe-lang="o and o.env.context.get('lang')"></div>
+                </t>
+            </t>
+        </template>
     </data>
 </odoo>