Does django has something like the rails ActiveRecord acts_as_list?
For those who don't know what acts_as_list is, it gives you the api
for dealing with an ordered list of objects. For example, think if
was modeling a book. I would have a Book object with a one to of a
simple Netflix queue. You might have a database table like this:
class Book(models.Model):
title = models.CharField(maxlength=50)
class Chapter(models.Model):
book = models.ForeignKey(Book)
position = models.IntegerField
title = models.CharField(maxlength=50)
Now, it would be nice if I could do something like this:
#Create the book
book = Book(title="Dive Into Python")
#Create a chapter, have it automatically set the position
#based on the current number of chapters
chapter = Chapter(book=b, title="Installing Python")
#If that's not possible, how would you do it manually, like this?
chapter = Chapter(book=b, title="Installing Python",
position=book.chapter_set.count()+1)
#Anyway, save the chapter
chapter.save()
#Make another chapterm. By the way, I'm a Java programmer, new to Python,
#will this work like I think? Does chapter now point to a new
instance of Chapter,
#and changes after this line would have no effect
#on the chapter I created in the previous line?
chapter = Chapter(book=b, title="Your First Python Program",
position=book.chapter_set.count()+1)
#Now I realize the chapters are out of order, so I want to re-order them
#It would be nice if this method would set the value of the current
#chapter's position to 1, and the value of the other chapter's position to 2
chapter.move_lower
Here are some links to acts_as_list:
http://rubyonrails.org/api/classes/ActiveRecord/Acts/List/InstanceMethods.html
http://brianfox.wordpress.com/2006/08/08/acts_as_list-in-ruby-on-rails/
Here are the methods with a description:
decrement_position Moves an item position down one
first? Returns true if item is first in list,
false if not higher_item Returns the record immediately above the
current record
in_list? Returns true if item is in list, false if not
increment_position Moves an item up one position
insert_at(position = 1) Adds an item to the list in a specific position
last? Returns true if item is last in list,
false if not
lower_item Returns the record immediately below the
current record
move_higher Moves an item up one position
move_lower Moves an item down one position
move_to_bottom Moves an item to the bottom of the list
move_to_top Moves an item to the top of the list
remove_from_list Removes an item from the list
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