Displaying 20 results from an estimated 2042 matches for "has_mani".
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has_many
2006 Apr 20
3
has_many :through with has_many/has_many join models
It seems that using a join model that joins with two has_many''s will
fail to generate proper SQL
class StudentSemesterRecord < ActiveRecord::Base
belongs_to :semester
has_many :discipline_records, :through => :semester
end
class Semester < ActiveRecord::Base
has_many :student_semester_records
has_many :discipline_records
end
class DisciplineRecord <
2006 Jul 23
4
has_many AND has_many :through ?
Hi,
I am working on a scheduling app and I have a perpelextion (new word).
I am wondering if the problem is my data model
I have Users.
Users can create Events.
Users can be invited to Events created by other Users.
So...
user.rb
class User < ActiveRecord::Base
has_many :invitations # invitations to other users'' events
has_many :events, :through => :invitations # all events
2006 Mar 30
5
Has_many :through problems -- please help
I''m having a lot of trouble with has_many, :through and could really
use some assistance.
I''ve got a User and Group class. Users can subscribe to groups, and
groups should know who''s subscribed.
I''ve got a join table (group_subscriptions) with group_id, user_id,
and it''s own id element.
Users has "has_many :groups, :through =>
2006 Aug 03
12
More than one has_many :through association between the same 2 models
I wonder if you can have more than one has_many :through association between
2 models.
For example...
I have a model Teacher and a model Class
Now, 1 Teacher works in many Classes, right?. So I need a join model like
class Work < ActiveRecord::Base
belongs_to :teacher
belongs_to :class
end
But I also would like to know if a teacher CAN teach a class before I
2006 Jul 04
2
has_many working correctly only on reload!
I have this code that is using svn externals with rails EDGE working
fine for the past couple of months. A couple of days ago, this code
died. Even after deleting vendor/rails, this code doesnt work:
class Tag < ActiveRecord::Base
has_many :taggings
has_many :events, :through => :taggings
has_many :users, :through => :taggings
end
class User < ActiveRecord::Base
# Virtual
2006 Nov 02
4
Still Having Problems With :through When Going To Same Table... Help... please :-(
I am having a problem with doing a :through that goes back to the same table.
The following are my two classes:
>>>>>
class User < ActiveRecord::Base
has_many :spanks
has_many :spanked, :through => :spanks, :source => :spanked_user
has_many :was_spanked_by, :through => :spanks, :source => :user
end
class Spank < ActiveRecord::Base
belongs_to :spanker,
2006 Feb 11
6
Rails Edge, has_many :through in searches
I have two tables, a Projects table and a Clients table.
It''s basically a HABTM relationship, but I have additional project/
client-specific information in the join table. I''m trying to use the
new has_many :through method to join these. It works fine when
displaying records, but when I try to search, I''m having this problem:
When I used a HABTM model to search
2006 Mar 31
3
Complex Through Statement
Quick Overview:
I have an ''Employee'', some ''Merchants'' and some ''Products''. A
''Merchant'' has many ''Products''. An ''Employee'' has multiple ''Merchants'',
depending on their relationship. For example, the Employee may be the
enrollment contact for one merchant and the
2010 Jan 27
2
has_many, through with nested models?
First the data model:
class Forum < ActiveRecord::Base
has_many :topics, :dependent => :destroy, :order => ''created_at
desc''
end
class User < ActiveRecord::Base
has_many :topics, :dependent => :destroy
has_many :comments, :dependent => :destroy
has_many :replies, :dependent => :destroy
end
class Topic < ActiveRecord::Base
belongs_to
2006 May 25
5
Model Structure Advise
Hi,
I''m starting to build a simple (?!) FAQ system, and I''d like some
advice on setting up the model relationships.
I was going to go with a simple system of a Category table and a FAQ
table (holding questions and answers) - where one FAQ belongs to one
category.
That''s all nice - a simple has_many / belongs_to relationship. Then I
decided to add another level - Area.
2008 Apr 11
2
Validating an ActiveRecord object and its has_many :through associations
Considering an object with several has_many :through => associations,
what is the ''best'' way to handle validations?
As an example:
class Student < ActiveRecord::Base
# some attrbutes like
# :name
# :grade
# relationships
has_many :students_assignment, :dependent => :destroy
has_many :assignments, :through => :students_assignment
has_many
2006 Mar 29
4
:through alternate
I''d like to use :through to create a web of associations like:
class Thing < ActiveRecord::Base
has_many :child_things, :through => :thing_thing
has_many :parent_things, :through => :thing_thing, :some_other_option?
end
class ThingThing < ActiveRecord::Base
belongs_to :thing
belongs_to :child_thing, :class_name => ''Thing'', :foreign_key =>
2007 Nov 24
12
orphan habtm rows
HI,
i use models User and Groups connected with many to many association, so
i have users table, groups and groups_users.
lets say i create one user and one group. next i add a group to user. so
now my table groups_users has one entry i.e.
group_id | user_id
_________|________
1 | 1
ok, when i delete both my group and user, above entry is not deleted,
thus leaving alone without
2006 Jul 10
10
has_many :through and foreign key parameters
I just took my HABTM and turned it into a :through since my join table
has another "non-joiny" attribute.
I went from this:
has_many_and_belongs_to :jobs, :join_table => ''tablename'',
:foreign_key => ''x'',
:association_foreign_key => ''y''
to this:
has_many :jobs, :through =>
2006 Aug 02
2
Self-Referential has_many :through
Hello all.
I am trying to create a self-referential has_many :through. I used the
following site as a guide
http://blog.hasmanythrough.com/articles/2006/04/21/self-referential-through
but it still doesn''t appear to be working. I have two models. Person and
Relationship. A person has many contacts (Which is another person)
through relationships
class Person < ActiveRecord::Base
2011 Jan 15
3
has_many :through with Single Table inheritance
I have the following model structure setup.
class User < ActiveRecord::Base
end
class Parent < User
has_many :relationships
has_many :children,
:class_name => "Student",
:through => :relationships,
:conditions => "related_as = ''parent''"
end
class Student < User
has_many :relationships
2006 May 28
7
Self-referential has_many :through relationship
Hi,
I have a self-referential has_many :through relationship setup to
track relationships between users. Basically relationships are
modeled as a join table with an extra column ''relation''.
create table relationships (
user_id integer unsigned not null,
friend_id integer unsigned not null,
relation char(1) not null,
)
--- relations ---
f = friend
r = request to
2010 Mar 01
3
has_many models in a form
Hi, guys.
There are four models in the program, A has_many B through C, B has_many
A through C, A has_many D, D belongs_to A. I have a form to create A.
Inspired by Ryan Bates'' railscasts I was able to create A and D in the
same form, and link A to B(created beforehand) through C in the same
form as well. Is it possible to create A and B in the same form?
Thanks in advance.
--
Posted
2005 Dec 26
2
Dynamic order on has_many relationship?
I was wondering if it''s possible to some how control the :order given
on a has_many depending on another attribute?
Or do I need to just create multiple has_many relationships pointing
to the same table but with different orders and then select which one
I use in the controller instead?
e.g
class Category < AR::B
has_many :products, :order => //something magical?//
end
2006 May 12
1
can I fake has_one :through?
I''m having a difficult time wrapping my head around a set of models
and their associations and seeing how they map into Rails. I''ll try
to lay out my problem using the has_many and belongs_to structures. I
have a RuleSpace, a Rule, and a Subject.
A RuleSpace has_many Rules
A RulesSpace has_many Subjects through Rules
A Rule belongs_to (many) RuleSpaces
A Rule has_many