Disable adding new transactions by default

Setup for this feature is a little more complicated, and it tends to
throw strange errors.

money_templates/templates/page_account_details.html

@@ -144,7 +144,7 @@
     </table>
   </div>
   {% include "txactions_page_block.html" %}
-  {% if accounts|length == 1 %}
+  {% if can_add_transactions %}
     <div class="block">
       <p>
         <strong>Add new transaction</strong>

money_views/views.py

@@ -89,7 +89,14 @@ def account(request, key):
   modify_form_data['save_rule'] = True
   modify_form = forms.ModifyForm(choices, modify_form_data, auto_id="modify_id_%s")
 
-  if len(accounts) == 1:
+  try:
+    can_add_transactions = settings.ENABLE_ADD_TRANSACTIONS
+  except AttributeError:
+    can_add_transactions = False
+
+  can_add_transactions = (can_add_transactions and len(accounts) == 1)
+
+  if can_add_transactions:
     new_transaction_form = forms.NewTransactionForm(choices)
   else:
     new_transaction_form = None
@@ -121,6 +128,7 @@ def account(request, key):
     'api_functions_js': json.dumps(api.function_urls.urls_dict),
     'accounts': accounts,
     'current_accounts_key': accounts_key(accounts),
+    'can_add_transactions': can_add_transactions,
     'account': accounts[0],
     'page': page,
     'filter_form': filter_form,

settings.example.py

@@ -163,6 +163,13 @@
 NUM_MERCHANTS_BATCH_CATEGORIZE = 50
 NUM_TRANSACTIONS_PER_PAGE = 50
 
+# This feature requires a little more setup.  Namely, the GnuCash API must be
+# properly set up (which generally requires building GnuCash from source) and
+# it must be made available to the application's virtualenv.  Also, the user
+# running the application must have write access to the gnucash_api_home/
+# directory.
+ENABLE_ADD_TRANSACTIONS = False
+
 
 if SHOW_DEBUG_TOOLBAR:
   MIDDLEWARE_CLASSES += (