Setting wallet dates earlier in the import process

parsers/survex.py

@@ -55,6 +55,33 @@ class SurvexLeg:
     compass = 0.0
     clino = 0.0
 
+def datewallet(w, earliest):
+    """Gets the date of the youngest survexblock associated with the wallet
+    REFACTOR this to do the whole date-getting task
+    
+    Currently there is only one SurvexBlock, but this is in anticipation of
+    chnaging the schema to allow many.
+    """
+    first = earliest
+    blocks = SurvexBlock.objects.filter(scanswallet=w) # only ONE I think ?!
+    for b in blocks:
+        if b.date:
+            if b.date < first:
+                first = b.date
+    if first == earliest:
+        # no date found
+        w.date = None
+    else:
+        w.date = first.isoformat()
+    return w.date
+
+def set_walletdate(w):
+    earliest = datetime.now().date()
+    if not w.date():  # sets .walletdate as a side-effect if it gets it from JSON
+        d = datewallet(w, earliest)  # Not in JSON, so checks all the survex blocks
+        w.walletdate = d
+        w.save()
+
 def stash_data_issue(parser=None, message=None, url=None, sb=None):
     """Avoid hitting the database for error messages until the end of the import"""
     global dataissues
@@ -848,6 +875,7 @@ class LoadingSurvex:
                 survexblock.save()
                 # This is where we should check that the wallet JSON contains a link to the survexfile
                 # and that the JSON date and walletdate are set correctly to the survexblock date.
+                set_walletdate(survexblock.scanswallet)
         else:
             perps = get_people_on_trip(survexblock)
             message = f" ! Wallet *REF bad in '{survexblock.survexfile.path}' '{refscan}' NOT in database i.e. wallet does not exist {perps}."