Add support for domain_<field name> method

issue4126
review6501002

CHANGELOG

@@ -1,3 +1,4 @@
+* Add support for domain_<field name> method
 * Refactor configuration file and command line
 * Use the context of the relation field for instanciation
 * Use a configuration field for logging

doc/ref/models/fields.rst

@@ -188,6 +188,18 @@ Default value
 
 See :ref:`default value <topics-fields_default_value>`
 
+Searching
+=========
+
+A class method could be defined for each field which must return a SQL
+expression for the given domain instead of the default one.
+The method signature is::
+
+    domain_<field name>(domain, tables)
+
+Where ``domain`` is the simple :ref:`domain <topics-domain>` clause and
+``tables`` is a nested dictionary, see :meth:`~Field.convert_domain`.
+
 Ordering
 ========
 

trytond/model/fields/field.py

@@ -251,6 +251,9 @@ class Field(object):
         table, _ = tables[None]
         name, operator, value = domain
         assert name == self.name
+        method = getattr(Model, 'domain_%s' % name, None)
+        if method:
+            return method(domain, tables)
         Operator = SQL_OPERATORS[operator]
         column = self.sql_column(table)
         expression = Operator(column, self._domain_value(operator, value))