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Code Issues 19 Projects 3 Activity

prefetch_related initial attempts

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This commit is contained in:
Philip Sargent 2022-07-05 14:14:03 +03:00
parent dbe6d10fff
commit a11541eb58
2 changed files with 10 additions and 0 deletions
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6
core/views/scans.py
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@ -58,5 +58,11 @@ def scansingle(request, path, file):
def allwallets(request): def allwallets(request):
'''Returns all the wallets in the system, we would like to use
the Django queryset SQL optimisation https://docs.djangoproject.com/en/3.2/ref/models/querysets/#prefetch-related
to get the related singlescan and survexblock objects but that requires rewriting this to do the query on those, not on
the wallets
'''
manywallets = Wallet.objects.all() manywallets = Wallet.objects.all()
# manywallets = Wallet.objects.all().prefetch_related('singlescan') fails as the link is defined on 'singlescan' not on 'wallet'
return render(request, 'manywallets.html', { 'manywallets':manywallets, 'settings': settings }) return render(request, 'manywallets.html', { 'manywallets':manywallets, 'settings': settings })

4
templates/manywallets.html
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@ -9,6 +9,10 @@
plans and elevations. It also contains scans of centre-line survex output on which plans and elevations. It also contains scans of centre-line survex output on which
hand-drawn passage sections are drawn. These hand-drawn passages will eventually be hand-drawn passage sections are drawn. These hand-drawn passages will eventually be
traced to produce Tunnel or Therion drawings and eventually the final complete cave survey. traced to produce Tunnel or Therion drawings and eventually the final complete cave survey.
<!-- This should all be restructured to use .prefetch_related() and .select_related()
see https://docs.djangoproject.com/en/3.2/ref/models/querysets/#prefetch-related
-->
<table width=95%> <table width=95%>
<tr><th>Scans folder</th><th>Files</th><th>Survex blocks</th><th>Cave</th></tr> <tr><th>Scans folder</th><th>Files</th><th>Survex blocks</th><th>Cave</th></tr>
{% for scanswallet in manywallets %} {% for scanswallet in manywallets %}