book/category: hierarchische sortierung, form optimiert

model.py

@@ -5,6 +5,68 @@
 
 from trytond.model import MultiValueMixin, ValueMixin, fields, Unique
 from trytond.transaction import Transaction
+from trytond.pool import Pool
+from sql import With, Literal
+from sql.functions import Function
+
+
+class ArrayApppend(Function):
+    """ sql: array_append
+    """
+    __slots__ = ()
+    _function = 'ARRAY_APPEND'
+
+# end ArrayApppend
+
+
+class ArrayToString(Function):
+    """ sql: array_to_string
+    """
+    __slots__ = ()
+    _function = 'ARRAY_TO_STRING'
+
+# end ArrayToString
+
+
+class Array(Function):
+    """ sql: array-type
+    """
+    __slots__ = ()
+    _function = 'ARRAY'
+
+    def __str__(self):
+        return self._function + '[' + ', '.join(
+            map(self._format, self.args)) + ']'
+
+# end Array
+
+
+def order_name_hierarchical(model_name, tables):
+    """ order by pos
+        a recursive sorting
+    """
+    Model2 = Pool().get(model_name)
+    tab_mod = Model2.__table__()
+    tab_mod2 = Model2.__table__()
+    table, _ = tables[None]
+
+    lines = With('id', 'name', 'name_path', recursive=True)
+    lines.query = tab_mod.select(
+            tab_mod.id, tab_mod.name, Array(tab_mod.name),
+            where = tab_mod.parent==None,
+        )
+    lines.query |= tab_mod2.join(lines,
+            condition=lines.id==tab_mod2.parent,
+        ).select(
+            tab_mod2.id, tab_mod2.name, ArrayApppend(lines.name_path, tab_mod2.name),
+        )
+    lines.query.all_ = True
+
+    query = lines.select(
+            ArrayToString(lines.name_path, '/').as_('rec_name'),
+            where = table.id==lines.id,
+            with_ = [lines])
+    return [query]
 
 
 class UserValueMixin(ValueMixin):