redirect to edit page when user attempts to add page that already exists

- update src/*/views/default.py
- update src/*/routes.py
- write new test
- revise docs, double-checking line counts and highlighting

5 files changed, 32 insertions, 2 deletions

diff --git a/docs/tutorials/wiki2/src/authentication/tutorial/views/default.py b/docs/tutorials/wiki2/src/authentication/tutorial/views/default.py
index ffe967f6e..1b071434c 100644
--- a/docs/tutorials/wiki2/src/authentication/tutorial/views/default.py
+++ b/docs/tutorials/wiki2/src/authentication/tutorial/views/default.py
@@ -65,6 +65,9 @@ def add_page(request):
     if user is None or user.role not in ('editor', 'basic'):
         raise HTTPForbidden
     pagename = request.matchdict['pagename']
+    if request.dbsession.query(Page).filter_by(name=pagename).count() > 0:
+        next_url = request.route_url('edit_page', pagename=pagename)
+        return HTTPFound(location=next_url)
     if 'form.submitted' in request.params:
         body = request.params['body']
         page = Page(name=pagename, data=body)
diff --git a/docs/tutorials/wiki2/src/authorization/tutorial/routes.py b/docs/tutorials/wiki2/src/authorization/tutorial/routes.py
index c7c3a2120..f0a8b7f96 100644
--- a/docs/tutorials/wiki2/src/authorization/tutorial/routes.py
+++ b/docs/tutorials/wiki2/src/authorization/tutorial/routes.py
@@ -1,4 +1,7 @@
-from pyramid.httpexceptions import HTTPNotFound
+from pyramid.httpexceptions import (
+    HTTPNotFound,
+    HTTPFound,
+)
 from pyramid.security import (
     Allow,
     Everyone,
@@ -19,6 +22,9 @@ def includeme(config):
 
 def new_page_factory(request):
     pagename = request.matchdict['pagename']
+    if request.dbsession.query(Page).filter_by(name=pagename).count() > 0:
+        next_url = request.route_url('edit_page', pagename=pagename)
+        raise HTTPFound(location=next_url)
     return NewPage(pagename)
 
 class NewPage(object):
diff --git a/docs/tutorials/wiki2/src/tests/tutorial/routes.py b/docs/tutorials/wiki2/src/tests/tutorial/routes.py
index c7c3a2120..f0a8b7f96 100644
--- a/docs/tutorials/wiki2/src/tests/tutorial/routes.py
+++ b/docs/tutorials/wiki2/src/tests/tutorial/routes.py
@@ -1,4 +1,7 @@
-from pyramid.httpexceptions import HTTPNotFound
+from pyramid.httpexceptions import (
+    HTTPNotFound,
+    HTTPFound,
+)
 from pyramid.security import (
     Allow,
     Everyone,
@@ -19,6 +22,9 @@ def includeme(config):
 
 def new_page_factory(request):
     pagename = request.matchdict['pagename']
+    if request.dbsession.query(Page).filter_by(name=pagename).count() > 0:
+        next_url = request.route_url('edit_page', pagename=pagename)
+        raise HTTPFound(location=next_url)
     return NewPage(pagename)
 
 class NewPage(object):
diff --git a/docs/tutorials/wiki2/src/tests/tutorial/tests/test_views.py b/docs/tutorials/wiki2/src/tests/tutorial/tests/test_views.py
index 5253183df..2c945ab33 100644
--- a/docs/tutorials/wiki2/src/tests/tutorial/tests/test_views.py
+++ b/docs/tutorials/wiki2/src/tests/tutorial/tests/test_views.py
@@ -98,6 +98,18 @@ class AddPageTests(BaseTest):
         from tutorial.views.default import add_page
         return add_page(request)
 
+    def test_it_pageexists(self):
+        from ..models import Page
+        from ..routes import NewPage
+        request = testing.DummyRequest({'form.submitted': True,
+                                        'body': 'Hello yo!'},
+                                       dbsession=self.session)
+        request.user = self.makeUser('foo', 'editor')
+        request.context = NewPage('AnotherPage')
+        self._callFUT(request)
+        pagecount = self.session.query(Page).filter_by(name='AnotherPage').count()
+        self.assertGreater(pagecount, 0)
+
     def test_it_notsubmitted(self):
         from ..routes import NewPage
         request = dummy_request(self.session)
diff --git a/docs/tutorials/wiki2/src/views/tutorial/views/default.py b/docs/tutorials/wiki2/src/views/tutorial/views/default.py
index c1d402f6a..bb6300b75 100644
--- a/docs/tutorials/wiki2/src/views/tutorial/views/default.py
+++ b/docs/tutorials/wiki2/src/views/tutorial/views/default.py
@@ -58,6 +58,9 @@ def edit_page(request):
 @view_config(route_name='add_page', renderer='../templates/edit.jinja2')
 def add_page(request):
     pagename = request.matchdict['pagename']
+    if request.dbsession.query(Page).filter_by(name=pagename).count() > 0:
+        next_url = request.route_url('edit_page', pagename=pagename)
+        return HTTPFound(location=next_url)
     if 'form.submitted' in request.params:
         body = request.params['body']
         page = Page(name=pagename, data=body)