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Code Issues Releases Wiki Activity

Fix the IntegerListField() DB type

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This commit is contained in:
Bradlee Speice 2013-01-09 20:48:28 -05:00
parent 4257e33f38
commit 91bc6cf5dd
3 changed files with 16 additions and 3 deletions
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5
archiver/listfield.py
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@ -22,6 +22,9 @@ class IntegerListField(models.TextField):
#Process a database string
#Validation first
if len(value) <= 0:
return []
if value[0] != '[' or value[-1] != ']':
raise ValidationError("Invalid input to parse a list of integers!")
@ -43,6 +46,6 @@ class IntegerListField(models.TextField):
separator_string = ", "
list_elements = separator_string.join(value)
list_elements = separator_string.join(map(str, value))
return "[" + list_elements + "]"

1
archiver/models.py
View File

@ -3,3 +3,4 @@ from django.db import models
# Create your models here.
from archive import Archive
from song import Song
from playlist import Playlist

13
archiver/playlist.py
View File

@ -5,7 +5,15 @@ from listfield import IntegerListField
"""
Playlist model
Each playlist is a high-level ordering of songs. That's really it...
Each playlist is a high-level ordering of songs. There really isn't much to a playlist - just its name, and the songs inside it.
However, we need to have a way to guarantee song order, in addition to re-ordering. A ManyToMany field can't do this.
As such, a custom IntegerListField is implemented - it takes a python list of ints, converts it to a text field in the DB,
and then back to a python list. This way, we can guarantee order, and have a song appear multiple times.
The IntegerListField itself uses the ID of each song as the int in a list. For example, a list of:
[1, 3, 5, 17]
Means that the playlist is made up of four songs. The order of the playlist is the song with index 1, 3, 5, and 17.
Additionally, the ManyToMany field is included to make sure we don't use the global Songs manager - it just seems hackish.
"""
class Playlist (models.Model):
@ -91,8 +99,9 @@ class Playlist (models.Model):
"""Export this internal playlist to a file format."""
#Default m3u playlist type, support others as I build them.
if playlist_type = "pls":
if playlist_type == "pls":
pass
else:
#Export m3u, default option
pass