[IMP] add a method on date_range object to retrieve FY start date from a date

account_fiscal_year/models/__init__.py

@@ -3,5 +3,6 @@
 # Copyright 2016 Camptocamp SA
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
+from . import date_range
 from . import date_range_type
 from . import res_company

account_fiscal_year/models/date_range.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+# Author: Damien Crier
+# Copyright 2016 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+from openerp import models
+from openerp.tools import (DEFAULT_SERVER_DATETIME_FORMAT)
+
+
+class DateRange(models.Model):
+    _inherit = 'date.range'
+
+    def find_daterange_fy_start(self, date):
+        """
+        try to find a date range with type 'fiscalyear'
+        with @param:date <= date_start
+        """
+        fy_id = self.env.ref('account_fiscal_year.fiscalyear')
+        date_str = date.strftime(DEFAULT_SERVER_DATETIME_FORMAT)
+        s_args = [
+            ('type_id', '=', fy_id.id),
+            ('date_start', '<=', date_str),
+            ('company_id', '=', self.company_id.id),
+        ]
+        date_range = self.env['date.range'].search(s_args)
+        return date_range.date_start