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--- python:grok_and_zope.app.undo [2012/09/12 14:08] – jenad
+++ python:grok_and_zope.app.undo [2017/11/15 09:09] (aktuell) – gelöscht jenad
@@ Zeile 1: / Zeile 1: @@
-====== What: undo transactions in grok ======
-Problem: zope.app.undo does not work with ZODB-3.10 and grok-1.10.3
-Solutions (all these are workarounds, use them at your own risk):
-==== 1. MenuItem Error ====
-as result of adding zope.app.undo to setup.py following error appears:
-  ConfigurationError: ('Unknown directive', u'http://namespaces.zope.org/browser', u'menuItem')
-edit
-  zope.app.undo-3.5.0-py2.7.egg/zope/app/undo/configure.zcml
-and delete the menuItem-Sections; menuItem is used bei ZMI and implemented bei zc.forms or other but not by zope.formlib; I use zope.formlib in grok apps
-==== 2. ZODB has changed the api ====
-Error after submit the transaction ID's:
-  "Duplicate tpc_begin calls for same transaction"
-The undo API has changed with ZODB 3.10. As noted in the changelog:
-        "The API for undoing multiple transactions has changed. To undo
-        multiple transactions in a single transaction, pass a list of
-        transaction identifiers to a database's undoMultiple method. Calling a
-        database's undo method multiple times in the same transaction now
-        raises an exception."
-        Your code calls undo multiple times, and needs to be changed accordingly.
-edit in
-  zope.app.undo-3.5.0-py2.7.egg/zope/app/undo/__init__.py
-the last def:
-old:
-<code python>
-    def _undo(self, ids):
-        for id in ids:
-            self.__db.undo(id)
-        transaction.get().setExtendedInfo('undo', True)
-</code>
-new:
-<code python>
-    def _undo(self, ids):
-        self.__db.undoMultiple(ids)
-        transaction.get().setExtendedInfo('undo', True)
-</code>
-==== Demo grok View ====
-<code python>
-from zope.app.undo import ZODBUndoManager
-from zope.app.undo.interfaces import IUndoManager
-from zope.component import getUtility
-from zope.interface import Interface
-class Undo(grok.View):
-  grok.context(Interface)
-  grok.require('zope.Public')
-  def getPrincipalTransactions(self, first=0, last=-20, showall=False):
-        context = None
-        if not showall:
-            context = self.context
-        undo = getUtility(IUndoManager)
-        return undo.getPrincipalTransactions(self.request.principal, context,
-                                             first, last)
-</code>
-and the undo.pt:
-<code html>
-<html i18n:domain="zope">
-<body>
-<form action="@@undoPrincipalTransactions.html" method="post">
-<div>
-  <tal:var define="global batch_size python:10;
-                   global first      python:int(request.get('first', 0));
-                   global showall    python:bool(request.get('showall', False))"
-                   />
-</div>
-<div>
-  <span tal:condition="showall">
-    <p>
-      <span i18n:translate="">You are looking at transactions
-      regardless of location.</span> <a href="?"
-      i18n:translate="">View only transactions in this location</a>.
-    </p>
-  </span>
-  <span tal:condition="not:showall">
-    <p>
-      <span i18n:translate="">You are looking only at transactions
-      from this location.</span> <a href="?showall=true"
-      i18n:translate="">View transactions regardless of location</a>.
-    </p>
-  </span>
-</div>
-<div>
-    <table style="width: 100%; border: none;">
-      <tr>
-        <th></th>
-        <th i18n:translate="heading-location">Location</th>
-        <th i18n:translate="heading-request-info">Request info</th>
-        <th i18n:translate="heading-principal">Principal</th>
-        <th i18n:translate="heading-date">Date</th>
-        <th i18n:translate="heading-description">Description</th>
-      </tr>
-      <tal:block repeat="item python:view.getPrincipalTransactions(first=first,
-                                                                   last=-batch_size,
-                                                                   showall=showall)">
-      <tr tal:attributes="class python:repeat['item'].odd() and
-                                       'content odd' or 'content even'">
-        <td width="16">
-          <input type="checkbox" name="ids:list" value="-1"
-                 tal:attributes="value item/id" />
-        </td>
-    <td tal:define="location item/location | nothing">
-          <tal:location replace="location" />
-          <tal:if condition="not:location"
-                  i18n:translate="label-not-available">not available</tal:if>
-        </td>
-        <td>
-          <tal:request_info replace="item/request_type | nothing" /><br />
-          <tal:request_info replace="item/request_info | nothing" />
-          <tal:if condition="python:not item.get('request_type', '') and
-                                    not item.get('request_info', '')"
-                  i18n:translate="label-not-available">not available</tal:if>
-        </td>
-        <td>
-          <tal:principal replace="item/principal/id | nothing" />
-          <tal:if condition="not:exists:item/principal/id"
-                  i18n:translate="label-not-available">not available</tal:if>
-        </td>
-        <td tal:define="formatter python:request.locale.dates.getFormatter(
-                                         'dateTime', 'medium')"
-            tal:content="python:formatter.format(item['datetime'])">
-        </td>
-        <td>
-          <tal:description i18n:translate=""
-            replace="item/description | nothing" />
-          <tal:if condition="not:item/description"
-                  i18n:translate="label-not-available">not available</tal:if>
-        </td>
-      </tr>
-      </tal:block>
-    </table>
-</div>
-<p>
-  <a tal:define="showall python:showall and '&showall=true' or ''"
-     tal:attributes="href python:'?first=%s%s'%(first+batch_size, showall)">
-    &lt;&lt;&lt;
-    <tal:text i18n:translate="">
-      View <tal:num replace="batch_size" i18n:name="number" />
-      earlier transactions
-    </tal:text>
-  </a>
-</p>
-<p>
-  <a tal:define="showall python:showall and '&showall=true' or ''"
-     tal:condition="python:first >= batch_size"
-     tal:attributes="href python:'?first=%s%s'%(first-batch_size, showall)">
-    <tal:text i18n:translate="">
-      View <tal:num tal:replace="batch_size" i18n:name="number" />
-      later transactions
-    </tal:text>
-    &gt;&gt;&gt;
-  </a>
-</p>
-<p>
-  <input type="submit" value="Undo"
-         i18n:attributes="value undo-button" />
-</p>
-<form>
-</body>
-</html>
-</code>