make nav cope with missing wallets

core/views/wallets.py

@@ -309,8 +309,47 @@ def walletedit(request, path=None):
         wallet = f"{year}:{wnumber:02d}"
         return (None, wallet)
         
+    def identify_most_recent_wallet(wallet, y):
+        """ Need to find the last wallet of the previous year
+        Has to cope with years when there are no wallets
+        Has to cope with weirdly named imported wallets from 1999 & earlier
+        Has to cope if the 'current' wallet is one that happens to 'not exist' too.
+        
+        Frankly this has just become too bizarre and we should devise a quite different
+        navigation system.
+        """
+        current_name = wallet.replace(":","#")
+           
+        try:
+            allwallets = Wallet.objects.all().order_by('walletname')
+            previous_wallet = allwallets.first()
+            for w in allwallets:
+                if len(w.walletname) < 5:
+                    continue
+                if w.walletname[4] != "#":
+                        continue
+   
+                if w.walletname == current_name:
+                    break
+                if int(w.walletyear.year) >= int(y):
+                    break
+                previous_wallet = w
+            name = previous_wallet.walletname
+           
+            y = name[:4]
+            prevy = f"{int(y)-1}"
+            n = name[5:]
+            prev = f"{int(n):02d}"
+            
+        except:
+            raise
+            prev = f"{int(n):02d}"  
+              
+        print(prev, prevy, y)
+        return prev, prevy, y
+                
     def create_nav_links(wallet):
-        print(f"--- {wallet} now current")
+        """Find the previous wallet and next wallet and create navigation shortcuts"""
         y = wallet[:4]
         n = wallet[5:]
         nexty = f"{int(y)+1}"
@@ -319,7 +358,7 @@ def walletedit(request, path=None):
         prev = f"{int(n)-1:02d}"
 
         if int(n) == 0: 
-            prev = f"{int(n):02d}"
+            prev, prevy, y = identify_most_recent_wallet(wallet, y)
  
         return next, nexty, prev, prevy, y
 
@@ -339,7 +378,7 @@ def walletedit(request, path=None):
                     DataIssue.objects.create(parser="scans", message=message, url=wurl)  # set URL to this wallet folder
                     raise
         else:  # no JSON file exists
-            print("--- No JSON exists, so creating blank copy")
+            print("--- No JSON exists, so using default copy")
             waldata = WALLET_BLANK_JSON.copy()
         if not waldata["survex file"]:
             try:
@@ -366,7 +405,7 @@ def walletedit(request, path=None):
         """We need a wallet Object so that the django template stuff can find the files"""
         try:
             w, created = Wallet.objects.get_or_create(walletname=walletname)
-            print(f"--- Wallet string {walletname}, wallet object {w} created new?: {created}")
+            # print(f"--- Wallet string {walletname}, wallet object {w} created new?: {created}")
             if created:
                 w.fpath = Path(settings.SCANS_ROOT, walletname[0:4], walletname)
                 w.save()
@@ -755,7 +794,7 @@ def walletedit(request, path=None):
             caveifywallet(thiswallet)
             thiswallet.ticks = thiswallet.get_ticks()  # the complaints in colour form
             # fixsurvextick(thiswallet, thiswallet.ticks)
-            print(f"--- {wallet}  {thiswallet} walletdate={thiswallet.walletdate} immediately before form render")
+            # print(f"--- {wallet}  {thiswallet} walletdate={thiswallet.walletdate} immediately before form render")
         except:
             thiswallet = None
         context = {

templates/base.html

@@ -32,7 +32,7 @@
     <a href="/survexfile/">Survex</a> |
     <a href="{% url "survexcaveslist" %}">All Survex</a> |
     <a href="{% url "allscans" %}">Scans</a> |
-    <a href="{% url "walletedit"  '0000:01' %}">Upload Scans</a> |
+    <a href="{% url "walletedit"  '/' %}">Upload Scans</a> |
     <a href="{% url "dwgallfiles" %}">Drawings</a> |
     <a href="{% url "dwgupload" %}">Upload Drawings</a> |
     <a href="{% url "photoupload" %}">Upload Photos</a> |

templates/wallet_new.html

@@ -6,7 +6,7 @@ Upload the survexfile using e.g.
 (for a survex file for cave 1623-290). You will cut and paste the survex file data into the window on the form.
 
 
-<p>While still logged-in, go to this page <a href="/walletedit/0000:00">Create Wallet</a> which will take you to the next unused wallet number page, and click the 'Create' button. This will not actually complete
+<p>While still logged-in, go to this page <a href="/walletedit/">Create Wallet</a> which will take you to the next unused wallet number page, and click the 'Create' button. This will not actually complete
 the creation of the wallet until you have also set the date for the wallet in the wallet edit form (which will appear when you press 'Create').
 <p>
 While editing the wallet you should  enter in the form the url of the survexfile which you have just created at e.g. <a href="/survexfile/caves-1623/290/mynewsurvex.svx">/survexfile/caves-1623/290/mynewsurvex.svx</a> (see above).

templates/walletform.html

@@ -5,7 +5,13 @@
 {% block content %}
 
 {% if user.username %}
+    {% if not create %}
     <h2>Wallet {{wallet}} - edit settings or upload a file</h2>
+    {% else %}
+    <h2>Wallet {{wallet}} - Create a new Wallet</h2>
+    {% endif %}
+</button>
+
 {% else %}
 <h2>Wallet {{wallet}}</h2>
 {% endif %}
@@ -63,6 +69,7 @@
         </p>
     {% endif %}
 
+{% if not create %}
     <p>
     {% for f in files %}
     <a href="/expofiles/surveyscans/{{year}}/{{wallet|urlencode}}/{{f}}">{{ f}}</a><br />
@@ -75,12 +82,14 @@
         <a href="/expofiles/surveyscans/{{year}}/{{wallet|urlencode}}/{{d}}"><em>{{d}}</em></a><br />
     {% endfor %}
     </ul>
+{% endif %}
+
 </div> 
 </p>
     {% if create %}
     This online wallet does not yet exist. 
         {% if user.username %}
-        <br><br>It will be created when you click the Create button, <em>and then edit the date in the form below and save it</em>.
+        <br><br>It will be created when you click the Create button, <em>and then edit the date in the form and save it</em>.
         {% else %}
         <br><br>To create a wallet, you need to <a href=/accounts/login/>Log In </a> first and then return to this page.
         {% endif %}

urls.py

@@ -87,7 +87,7 @@ trogglepatterns = [
     re_path(r'^admin/',      admin.site.urls), # includes admin login & logout urls
     
 # Uploads - uploading a file
-    path('walletedit/',                walletedit,  name='walletedit'), # path=2020#01
+    path('walletedit/',                walletedit,  name='walletedit'), 
     path('walletedit/<path:path>',     walletedit,  name='walletedit'), # path=2020#01
     path('photoupload/',                 photoupload, name='photoupload'), # restricted to current year
     path('photoupload/<path:folder>',    photoupload, name='photoupload'), # restricted to current year