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Commit
fec342df
authored
Mar 19, 2014
by
Őry Máté
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common: add HumanSortField
parent
bedb2e12
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circle/common/models.py
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circle/common/models.py
View file @
fec342df
from
collections
import
deque
from
hashlib
import
sha224
from
logging
import
getLogger
from
time
import
time
...
...
@@ -139,3 +140,78 @@ def method_cache(memcached_seconds=60, instance_seconds=5): # noqa
return
x
return
inner_cache
class
HumanSortField
(
CharField
):
"""
A CharField that monitors another field on the same model and sets itself
to a normalized value, which can be used for sensible lexicographycal
sorting for fields containing numerals. (Avoiding technically correct
orderings like [a1, a10, a2], which can be annoying for file or host
names.)
Apart from CharField's default arguments, an argument is requered:
- monitor sets the base field, whose value is normalized.
- maximum_number_length can also be provided, and defaults to 4. If
you have to sort values containing numbers greater than 9999, you
should increase it.
Code is based on carljm's django-model-utils.
"""
def
__init__
(
self
,
*
args
,
**
kwargs
):
logger
.
debug
(
'Initing HumanSortField(
%
s
%
s)'
,
unicode
(
args
),
unicode
(
kwargs
))
kwargs
.
setdefault
(
'default'
,
""
)
self
.
maximum_number_length
=
kwargs
.
pop
(
'maximum_number_length'
,
4
)
monitor
=
kwargs
.
pop
(
'monitor'
,
None
)
if
not
monitor
:
raise
TypeError
(
'
%
s requires a "monitor" argument'
%
self
.
__class__
.
__name__
)
self
.
monitor
=
monitor
kwargs
[
'blank'
]
=
True
super
(
HumanSortField
,
self
)
.
__init__
(
*
args
,
**
kwargs
)
def
get_monitored_value
(
self
,
instance
):
return
getattr
(
instance
,
self
.
monitor
)
def
get_normalized_value
(
self
,
val
):
def
partition
(
s
,
pred
):
match
,
notmatch
=
deque
(),
deque
()
while
s
and
pred
(
s
[
0
]):
match
.
append
(
s
.
popleft
())
while
s
and
not
pred
(
s
[
0
]):
notmatch
.
append
(
s
.
popleft
())
return
(
''
.
join
(
match
),
''
.
join
(
notmatch
),
s
)
logger
.
debug
(
'Normalizing value:
%
s'
,
val
)
norm
=
""
val
=
deque
(
val
)
while
val
:
numbers
,
letters
,
val
=
partition
(
val
,
lambda
s
:
s
[
0
]
.
isdigit
())
norm
+=
numbers
and
numbers
.
rjust
(
self
.
maximum_number_length
,
'0'
)
norm
+=
letters
logger
.
debug
(
'Normalized value:
%
s'
,
norm
)
return
norm
def
pre_save
(
self
,
model_instance
,
add
):
logger
.
debug
(
'Pre-saving
%
s.
%
s.
%
s'
,
model_instance
,
self
.
attname
,
add
)
value
=
self
.
get_normalized_value
(
self
.
get_monitored_value
(
model_instance
))
setattr
(
model_instance
,
self
.
attname
,
value
[:
self
.
max_length
])
return
super
(
HumanSortField
,
self
)
.
pre_save
(
model_instance
,
add
)
# allow South to handle these fields smoothly
try
:
from
south.modelsinspector
import
add_introspection_rules
add_introspection_rules
(
rules
=
[
(
(
HumanSortField
,),
[],
{
'monitor'
:
(
'monitor'
,
{}),
'maximum_number_length'
:
(
'maximum_number_length'
,
{}),
}
),
],
patterns
=
[
'common
\
.models
\
.'
])
except
ImportError
:
pass
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