Displaying 20 results from an estimated 1100 matches similar to: "Managing Hierarchical Data"
2006 Jan 16
2
acts_as_tree with Modified Preorder Traversal?
Has anyone extended Rails''s acts_as_tree to use the Modified Preorder
Traversal algorithm? This is a really clever trick for optimizing
access to trees stored in databases, as described lucidly in this
article:
http://www.sitepoint.com/article/hierarchical-data-database/2
It adds two integer fields, a "left counter" and "right counter", to
each row. By
2006 Feb 25
3
Enumerating over a Tree by Depth
I have a model using acts_as_tree which is working fine.
Being new to Ruby I''m don''t know what enumerator is best to use for
traversing a tree by depth. I can write one, but before I do I wanted
to know if there is there an enumerator for traversing trees available
that the community recommends?
Thank you,
Jose
--
Posted via http://www.ruby-forum.com/.
2009 Aug 19
10
acts_as_list / acts_as_tree / acts_as_nested_set - which one
I am creating forum application which needs usage of acts_as_list or
acts_as_tree or acts_as_nested_set.
I am unable to decide among these. please could some one recommend from
their experience?
--
Posted via http://www.ruby-forum.com/.
2009 Feb 17
8
Converting Acts_As_Tree to Acts_As_Nested_Set
Hello,
I have a tree structure that needs to be converted into a nested set.
A great deal of work has already been done on the tree items, so
maintaining the integrity of the id''s is mandatory. However I need
the ability to access entire branches of the tree, which is what
Nested set does. Does anyone have any suggestions on how to
efficiently transfer the tree to the nested set and
2006 May 23
7
self-referencing has_many
Having a devil of a time finding records in a self-referencing has_many
table relationship.
Everything is working find looking at the has_many and the belongs_to
relationship.
But, when I try to find all "orphans", records that are neither a parent
nor a child, I can not find a query that work in ActiveRecord.
This query works in MySQL:
SELECT * FROM templates
LEFT JOIN templates
2005 May 17
8
acts_as_tree elegant tree printing
Hi,
I''m working with acts_as_tree to print an unordered list of items:
Root
-- Child
---- Child
I''ve got this working, however I''d like to know if there is a more
elegant fashion that I''m unaware of:
#Takes a parent category and recursivley returns all children
def find_all_subcategories(category)
if category.children.size > 0
2010 May 12
3
Best Gem For Threaded Comment Storage?
Dear List,
Given that I am developing a rails 2.3.5 site,
When it comes to storing threaded comments in a blog or forum,
Then which plugin/gem should be considered "State of the Art"?
I''m starting with these URLs:
http://github.com/rails/acts_as_tree
http://github.com/rails/acts_as_nested_set
http://github.com/collectiveidea/awesome_nested_set
2006 Mar 03
5
Message Board?
I''m interested in working on a message board application that uses ruby on
rails.
I''d like to see something end up similar to vBullieten, but with more of a
37signals type of less-is-more philosophy... mostly meaning less need for
preferences and settings and configurations.
I''ve checked rubyforge, and it looks like there are various forum apps
uploaded there, some
2006 Jul 18
1
Bad values for acts_as_nested_set?
I moved from acts_as_tree to acts_as_nested_set because I need the
all_children method.
I''ve seen an alternative way to add this method to acts_as_tree here:
http://www.chuckvose.com/articles/2006/05/24/recursive-children
But I''d prefer to use the more efficient way of acts_as_nested_set (and
not to have to revert to my old code).
Anyway, here''s my issue: if I
2007 May 02
3
acts_as_tree related question
hi,
I''ve a normal Category model implemented with acts_as_tree (name,
parent_id) that has_many :products (name, category_id).
What I''m asking for is a method to fetch every product that belongs
fall into a particular category and its children, eg: if I''m asking
for a root node (/category/show/1) I need to display every product
that have category_id = 1 AND every product
2011 Feb 18
1
Rails plugins new official maintainers
Hey guys,
This is the final list of the new maintainers of each plugin.
We need two more things to do:
First please the owners of the repos add the rest of the maintainers.
Second I will add a note on each rails/plugin mentioning this repos updates.
So from now on, if someone else is interested in helping/contributing
please send a message to the appropriate repo owner.
verification
2001 Nov 20
6
winbind and groups
I've got Samba 2.2.2 and winbind up and running fine
between a TurboLinux server and an NT 4.0 PDC. I can
"chown" files on the linux box fine using "$chown
DOMAIN+username filename" but when i try to change an
objects group using "$chgrp DOMAIN+groupname filename"
i get errors stating that it is an invalid group name.
What's the deal here? None of my group
2005 Jul 25
2
acts_as_tree and traversing parent/child relationships
I am working on an Rails application that uses a pretty complex
category structure through out the site. I have defined a table to
house all the info and a FK to reference parents within the table
CREATE TABLE categories (
id int(11) NOT NULL auto_increment,
name varchar(50) NOT NULL,
parent_id int(11) default NULL,
constraint fk_category_id foreign key (category_id) references
2009 Jul 31
6
Background daemon
It''s sending e-mail every hour, but I changed to sleep for a day, but
keep send the e-mail by hour. I don''t know what to do to send daily.
Could somebody help me?
thanks
############
# mailer.rb
###############
#!/usr/bin/env ruby
# You might want to change this
ENV["RAILS_ENV"] ||= "production"
require File.dirname(__FILE__) +
2006 Nov 29
4
how do I model self-referential entities?
Hi all -
I am having some trouble figuring out how to model self-referential
entities in Rails.
I have a "group" model, which can have 0 or more "group" objects or 0 or
more "user" objects.
I tried creating a subgroup table that has a parent_group_id and a
child_group_id as foreign keys but can''t figure out how to create the
mapping in my ruby model
2006 Jun 20
2
Converting from acts_as_tree to acts_as_nested_set
I''m currently using acts_as_tree to display threaded Comments on my
forums-like site. It''s waaay too slow to display a page with 1,000
comments, as it''s issuing a TON of selects.
I''m pretty sure I want to convert to the nested set model, using
acts_as_nested_set or acts_as_threaded. This should give me the
performance I''m looking for.
The problem,
2009 Nov 19
3
Log File Location
This may be a dumb question, but where can I see the error logs that
are usually displayed when unicorn is not daemonized? The
production.log file is empty in my app. Everything is currently
running as root.
2010 Nov 20
6
unicorn 3.0.0 - disable rewindable input!
Changes:
Rewindable "rack.input" may be disabled via the
"rewindable_input false" directive in the configuration file.
This will violate Rack::Lint for Rack 1.x applications, but can
reduce I/O for applications that do not need a rewindable
input.
This release updates us to the Kgio 2.x series which should play
more nicely with other libraries and applications. There are
2006 Jun 06
5
ruby mathematical expression parser
Hi,
Has anyone come across a Ruby mathematical expression parser, capable
of parsing out token, replacing them with values then executing the
mathematical formula? Nothing too heavy, A * (44/12) * ... etc. where
A is can be replaced with a value.
In Java there are serveral, like JEP, but I''d prefer it we could get a
Ruby one now we have moved over to Rails, otherwise we will have to
2006 May 02
1
Active Records Tree Cache
Hi,
I have a model that uses acts_as_tree option to manage a tree structure
in the database. Is it possible to fetch the entire tree with constant
number of database calls and cache the tree in memory?
Thanks!
Bob
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Posted via http://www.ruby-forum.com/.