Rails - Jul 2007 - acts as list -- adding or moving new item to new location

right now i''m adding an item to my ''list'' but
i''m unsure how to move
it to a certain spot in the list. specifically i want to put it at the
bottom of the list. i assumed that if i did something like

parent.children << new_child

then the ''position'' field in the child table would be given
some
sensible default by rails but instead it''s set to NULL.

of course there''s a bunch of ugly ways i can make this work but
i''m
wondering what would be the best/cleanest way...?

thanks in advance,
mike


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You must be doing something wrong if position is not being set by
acts_as_list.

Here''s an example:

---- migrations
create_table :parents, :force => true do |t|
end

create_table :children, :force => true do |t|
  t.column :parent_id, :integer
  t.column :name, :string
  t.column :position, :integer
end

---- models
class Parent < ActiveRecord::Base
  has_many :children, :order => :position
end

class Child < ActiveRecord::Base
  belongs_to :parent
  acts_as_list :scope => parent
end

---- some methods on acts_as_list you can use to manipulate the list
decrement_position
first?
higher_item
in_list?
increment_position
insert_at
last?
lower_item
move_higher
move_lower
move_to_bottom
move_to_top
remove_from_list

---- so you can do stuff like
puts parent.children[0].first? #=> true
parent.children[0].move_lower
parent.children[2].move_to_top

On Jul 12, 12:22 pm, mike
<mikebannis...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> right now i''m adding an item to my ''list'' but
i''m unsure how to move
> it to a certain spot in the list. specifically i want to put it at the
> bottom of the list. i assumed that if i did something like
>
> parent.children << new_child
>
> then the ''position'' field in the child table would be
given some
> sensible default by rails but instead it''s set to NULL.
>
> of course there''s a bunch of ugly ways i can make this work but
i''m
> wondering what would be the best/cleanest way...?
>
> thanks in advance,
> mike

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