formdef: avoid duplicated url_name

wcs/formdef.py

@@ -103,7 +103,7 @@ class FormDef(StorableObject):
             except ValueError:
                 self.url_name = self.id
             else:
-                self.url_name = simplify(self.name)
+                self.url_name = self.get_new_url_name()
             changed = True
 
         if self.fields and type(self.fields[0]) is dict:
@@ -153,8 +153,23 @@ class FormDef(StorableObject):
         setattr(sys.modules['wcs.formdef'], self.url_name.title(), cls)
         return cls
 
-    def store(self):
+    def get_new_url_name(self):
         new_url_name = simplify(self.name)
+        base_new_url_name = new_url_name
+        suffix_no = 0
+        while True:
+            try:
+                formdef = self.get_by_urlname(new_url_name)
+            except KeyError:
+                break
+            if formdef.id == self.id:
+                break
+            suffix_no += 1
+            new_url_name = '%s-%s' % (base_new_url_name, suffix_no)
+        return new_url_name
+
+    def store(self):
+        new_url_name = self.get_new_url_name()
         if not self.url_name:
             self.url_name = new_url_name
         if get_publisher().has_site_option('postgresql') and get_cfg('postgresql', {}):