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Final query optimisation for attendee_data view

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This commit is contained in:
Christopher Neugebauer 2016-10-05 12:17:40 -07:00
parent ffe5194893
commit ace7aa3efa
1 changed files with 10 additions and 4 deletions
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14
registrasion/reporting/views.py
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@ -543,13 +543,19 @@ def attendee_data(request, form, user_id=None):
).exclude(
cart__status=commerce.Cart.STATUS_RELEASED
).select_related(
"cart", "cart__user", "product", "product__category",
"cart", "cart__user", "product", "product__category",
).order_by("cart__status")
# Make sure we select all of the related fields
related_fields = set(
field for field in fields
if isinstance(AttendeeProfile._meta.get_field(field), RelatedField)
)
# Get all of the relevant attendee profiles in one hit.
profiles = AttendeeProfile.objects.filter(
attendee__user__cart__productitem__in=items
).select_related("attendee__user")
).select_related("attendee__user").prefetch_related(*related_fields)
by_user = {}
for profile in profiles:
by_user[profile.attendee.user] = profile
@ -578,7 +584,7 @@ def attendee_data(request, form, user_id=None):
field_verbose = concrete_field.verbose_name
# Render the correct values for related fields
if isinstance(concrete_field, RelatedField):
if field in related_fields:
# Get all of the IDs that will appear
all_ids = profiles.order_by(field).values(field)
all_ids = [i[field] for i in all_ids if i[field] is not None]
@ -640,7 +646,7 @@ def attendee_data(request, form, user_id=None):
attr = getattr(profile, field)
if isinstance(field_type, models.ManyToManyField):
return [str(i) for i in attr.all()]
return [str(i) for i in attr.all()] or ""
else:
return attr