Displaying 20 results from an estimated 30000 matches similar to: "Using custom routes to handle new nested resources"
2009 Mar 08
2
RESTful nested resources and polymorphism?
With ref to my previous post: http://www.ruby-forum.com/topic/180356
I am now able to access items from topics controller. However, now I
need to add sub-item e.g.: An item itself could have many sub-items. So
my items model is like:
class Item < ActiveRecord::Base
validates_uniqueness_of :title, :scope => [:topic_id]
validates_presence_of :topic_id, :title, :owner, :position
2006 Mar 24
6
Should counter_cache fields be saved in the database?
As far as I can tell, the counter_cache option on a belongs_to model
doesn''t actually save anything in the database. For example, I have
the following models:
class Parent < ActiveRecord::Base
has_many :children,
:conditions => "deleted_at IS NULL"
end
class Child < ActiveRecord::Base
belongs_to :parent, :counter_cache => true
end
With the following
2008 Jan 02
1
wants to get all parents with no children, etc
To all:
hi,
i have implemented the associations in my models
so i have a Parent model that has many Children model
but i need to get a list of Parents that do not have children
or
Parents that have just 2 children
or Parents that have children whose name is ''James'', or ''Sarah'', or
''Betty''
or Parents whose children do not have names like
2006 Jul 13
1
How to create a child from a parent
Hi i am trying to figure out what is the best way to do this very basic
thing:
lets say i have two tables: one with parents and one with children.
there is a one to many relation between them.
I scaffolded the parents tabel and i can open each parent. Now i want to
add a link to the ''show'' view which will create a new child record.
In the model i defined the has_many and
2006 Mar 21
5
Order records based on number of children
Let''s say I have simple schema with two tables. The models are defined
like the folllowing:
class Parent < ActiveRecord::Base
has_many :children
end
class Child < ActiveRecord::Base
belongs_to :parent
end
Simple has_many relationship. Is there any way to order the results of
a Parent.find_all by the number of children the parent has? I can
sort with
sorted_parents =
2006 Jan 05
2
Confused...
Ok,
So, I''ve got two data tables associated through a foreign key.
class Child < ActiveRecord::Base
belongs_to :parent, :class => Parent, :foreign_key => "parent_id"
# also has attr1, attr2
end
class Parent < ActiveRecord::Base
has_many :children, :class => Child, :foreign_key => "parent_id"
end
So, I''m trying to build the new/edit
2006 Feb 23
3
has_many: inserting children when inserting parent
disclaimer: am in the midst of my first ruby/rails project
I have a situation where I want several child records to be created when
a new parent record is created. The following represents my first stab
at coding it, am I on the right track?
Here is the model:
parents
----------
id
name
children
----------
id
parent_id
name
class Parent < ActiveRecord::Base
has_many: children
end
2005 Sep 23
6
problem with acts_as_tree
Hi,
I''m using the latest gem version of rails under MacOS Tiger.
I was trying to use acts_as_tree as described in the rails book. So
I have something like:
class Category < ActiveRecord::Base
acts_as_tree :order => "title"
end
create table categories (
id int not null
auto_increment,
title
2006 Sep 13
1
Eager loading with acts_as_tree
So I have a model that acts_as_tree and I run a method on a collection
of all of these records. This method walks the tree and fetches the
parent/children, etc. This results in many, many duplicate SQL queries
to be executed. Is there a way to eagerly load all of these models?
Something along the lines of:
Model.find(:all, :include => [:children, :parent])
If I execute the above statement, I
2006 Jun 16
1
sortable acts_as_tree with heirarchy
I''ve been stumbling on the tut at oriontransfer
(http://wiki.oriontransfer.co.nz/main/show/SortableTree)
I''ve got it working in a one dimensional list and I''ve got the drag and
drop working on children, but as can''t get it to save the tree.
Here''s my view:
<h2>Menu Prototype 2</h2>
<%= flash[:notice] %>
<ul
2006 Feb 01
2
How do you display nested elements in their hierarchy?
Hello;
I''d like some pointers on how to display nested items in their
hierarchy. I''m developing a project that uses habtm (as opposed to "acts
as tree"). I can interact with the elements using "parent", "child" etc.
fine. I just can''t figure out how to make the elements *display* in
their relationships.
For example, if Ruby on Rails is
2006 Mar 25
2
acts_as_tree wierdness with children.count and children.size
i am making a category tree and i iterate over the category using my
counter_cache however it would show a different number than what was
actually being represetned in the tree.
Here is an example
cat.children = [cat2, cat3]
puts cat.children.size 2
puts cat.children_count 2
cat4.parent_id = cat.id
cat4.save
puts cat.children.size
2006 Mar 22
10
Need for multiple acts_as_list
I have a model "Childmodel" that belongs_to two other models "Parent1"
and "Parent2". "Parent1" "has_many :childmodels, :order => :positionp1"
and "Parent2" "has_many :childmodels, :order => :positionp2". i.e. The
child is independently positioned within each of its parents.
This works fine and gets me the useful
2006 Jun 07
2
destroy on has_many relationships.
i need to delete a record from the database and delete all of it''s
children as well. is there a method for this? right now, i am finding
all the children with the parent_id and destroying them first and then
destroying the parent. seems like there would be a better way to do this
but i can''t seem to figure it out.
thanks,
josh
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Posted via http://www.ruby-forum.com/.
2006 Feb 02
3
acts_as_family_tree
For a project that I am working on I need to have a family tree. This
means that instead of having one parent each item has at most two. As
far as I know acts_as_tree only allows one parent_id. Any suggestions
on how to make a "acts_as_family_tree" ?
Thanks,
Mark
--
--------------------------------------------------------------------
I am Mark Daggett and I approve this message.
2007 Feb 14
3
eager loading parents and children (acts_as_tree)
I am struggling with how to do eager loading of an acts_as_tree model.
If the model Stuff acts_as_tree I know I can do this to get children as
well:
Stuff.find(:all, :include => :children)
But what if the model I am including is the one that acts_as_tree?
For example, say Picture belongs_to Category. Category acts_as_tree and
I want to get all pictures that are members of a category that
2008 May 27
2
HABTM using two columns
Hi all,
I was wondering whether anyone could guide me to docu and code
examples how to create and use a has_and_belongs_to_many relationship
with a joining table where TWO columns are used to identify the
relation to TWO alternative tables.
Example:
table 1: mothers [mother_id, name]
table 2: fathers [father_id, name]
table 3: children [child_id, name]
joining table 4: children_parent
2006 Jan 12
4
How do you create a tree strucutre with ActiveRecord
I want to build an application that has the concept of administrative
domains. What I mean by this is that administrators have access to
different data, based on what domains they are a member of. The domain
strucutre is hierarchical. Here is an example:
- MLB
- AL
- East
- Yankees
- Red Sox
...
+ Central
+ West
- NL
+ East
+ Central
+ West
Now
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
2007 Oct 22
1
self-referential habtm: why are my keys null?
I''m trying to set up a directional self-referential HABTM to represent
an arbitrary semi-hierarchical structure; it works for any data
prepopulated into the db, but when I try to create a new relationship,
I just get NULLs in both key columns (or 0''s if I turn on the no-null
constraint).
Here are the migrations:
class CreateNodes < ActiveRecord::Migration
def self.up