Reimplement Data Stream append as Exchange Dialog

The previous implementation did not support saving categories in view form.
It is better to use standard Base_edit in view forms and put actions which are other than "save"
into a dialog.

bt5/erp5_wendelin/SkinTemplateItem/portal_skins/erp5_wendelin/DataStream_appendFile.py

+context.appendData(append_file.read())
+  
+message = context.Base_translateString("Data Stream updated.")
+return context.Base_redirect(
+  'view', 
+  keep_items=dict(portal_status_message=message)
+)

bt5/erp5_wendelin/SkinTemplateItem/portal_skins/erp5_wendelin/DataStream_saveDataStream.xml → bt5/erp5_wendelin/SkinTemplateItem/portal_skins/erp5_wendelin/DataStream_appendFile.xml

@@ -50,11 +50,11 @@
         </item>
         <item>
             <key> <string>_params</string> </key>
-            <value> <string>form_id, **kw</string> </value>
+            <value> <string>append_file, **kw</string> </value>
         </item>
         <item>
             <key> <string>id</string> </key>
-            <value> <string>DataStream_saveDataStream</string> </value>
+            <value> <string>DataStream_appendFile</string> </value>
         </item>
       </dictionary>
     </pickle>

bt5/erp5_wendelin/SkinTemplateItem/portal_skins/erp5_wendelin/DataStream_saveDataStream.py

-request = container.REQUEST
-response =  request.response
-
-field_prefix = 'field_my_' # Prevent changing the prefix through publisher
-field_prefix_len = len(field_prefix)
-fields = {}
-
-for key, value in request.form.items():
-  if key.startswith(field_prefix) and value:
-    fields[key[field_prefix_len:]] = value
-
-if fields.has_key('append_file'):
-  context.appendData(fields['append_file'].read())
-  del fields['append_file']
-
-context.edit(**fields)
-message = context.Base_translateString("Data Stream updated")
-return context.Base_redirect(
-  'view', 
-  keep_items=dict(portal_status_message=message), 
-  **kw
-)

bt5/erp5_wendelin/SkinTemplateItem/portal_skins/erp5_wendelin/DataStream_view.xml

@@ -14,7 +14,7 @@
         </item>
         <item>
             <key> <string>action</string> </key>
-            <value> <string>DataStream_saveDataStream</string> </value>
+            <value> <string>Base_edit</string> </value>
         </item>
         <item>
             <key> <string>description</string> </key>
@@ -90,7 +90,6 @@
                         <string>my_filename</string>
                         <string>my_size</string>
                         <string>my_file</string>
-                        <string>my_append_file</string>
                         <string>my_translated_validation_state_title</string>
                       </list>
                     </value>

bt5/erp5_wendelin/SkinTemplateItem/portal_skins/erp5_wendelin/DataStream_viewAppendFileExchangeDialog.xml

+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="ERP5 Form" module="erp5.portal_type"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>_bind_names</string> </key>
+            <value>
+              <object>
+                <klass>
+                  <global name="NameAssignments" module="Shared.DC.Scripts.Bindings"/>
+                </klass>
+                <tuple/>
+                <state>
+                  <dictionary>
+                    <item>
+                        <key> <string>_asgns</string> </key>
+                        <value>
+                          <dictionary/>
+                        </value>
+                    </item>
+                  </dictionary>
+                </state>
+              </object>
+            </value>
+        </item>
+        <item>
+            <key> <string>_objects</string> </key>
+            <value>
+              <tuple/>
+            </value>
+        </item>
+        <item>
+            <key> <string>action</string> </key>
+            <value> <string>DataStream_appendFile</string> </value>
+        </item>
+        <item>
+            <key> <string>description</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>edit_order</string> </key>
+            <value>
+              <list/>
+            </value>
+        </item>
+        <item>
+            <key> <string>encoding</string> </key>
+            <value> <string>UTF-8</string> </value>
+        </item>
+        <item>
+            <key> <string>enctype</string> </key>
+            <value> <string>multipart/form-data</string> </value>
+        </item>
+        <item>
+            <key> <string>group_list</string> </key>
+            <value>
+              <list>
+                <string>left</string>
+              </list>
+            </value>
+        </item>
+        <item>
+            <key> <string>groups</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>left</string> </key>
+                    <value>
+                      <list>
+                        <string>your_append_file</string>
+                      </list>
+                    </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>DataStream_viewAppendFileExchangeDialog</string> </value>
+        </item>
+        <item>
+            <key> <string>method</string> </key>
+            <value> <string>POST</string> </value>
+        </item>
+        <item>
+            <key> <string>name</string> </key>
+            <value> <string>DataStream_viewAppendFileExchangeForm</string> </value>
+        </item>
+        <item>
+            <key> <string>pt</string> </key>
+            <value> <string>form_dialog</string> </value>
+        </item>
+        <item>
+            <key> <string>row_length</string> </key>
+            <value> <int>4</int> </value>
+        </item>
+        <item>
+            <key> <string>stored_encoding</string> </key>
+            <value> <string>UTF-8</string> </value>
+        </item>
+        <item>
+            <key> <string>title</string> </key>
+            <value> <string>Append File</string> </value>
+        </item>
+        <item>
+            <key> <string>unicode_mode</string> </key>
+            <value> <int>0</int> </value>
+        </item>
+        <item>
+            <key> <string>update_action</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>update_action_title</string> </key>
+            <value> <string></string> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>