I tried to user delete_if on an association:
class Group < ActiveRecord::Base
has_many :memberships, :dependent => :destroy
has_many :users, :through => :memberships
...
end
This is the controller method, trying to use delete_if. Although some
elements are removed (s2 < s1), the save method does not update the
association.
def intersect_or_remove_group
other_group = Group.find(params[:group_id])
s1 = @group.users.size
case params[:submit]
when "Intersect"
@group.users.delete_if { |u| !other_group.users.include?(u) }
when "Remove"
@group.users.delete_if { |u| other_group.users.include?(u) }
end
s2 = @group.users.size
if s2 < s1
@group.save
end
redirect_to @group
end
If I rewrite it like this, it works just fine:
def intersect_or_remove_group
other_group = Group.find(params[:group_id])
s1 = @group.users.size
to_be_deleted = Array.new
case params[:submit]
when "Intersect"
@group.users.each { |u| to_be_deleted << u if !
other_group.users.include?(u) }
when "Remove"
@group.users.each { |u| to_be_deleted << u if
other_group.users.include?(u) }
end
to_be_deleted.each { |u| @group.users.delete(u) }
s2 = @group.users.size
if s2 < s1
@group.save
end
redirect_to @group
end
Is this a bug or a feature?
Thanks for any help in advance
Regards
Alexander
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