Displaying 20 results from an estimated 1000 matches similar to: "create 2 fk referencing the same table"
2006 Mar 07
13
Active Record - Can''t figure out relationship.
I have the following two tables:
create table teams (
id int not null auto_increment,
short_name varchar(12) not null,
long_name varchar(50) not null,
logo varchar(20) not null,
primary key (id)
);
create table rounds (
id int not null auto_increment,
home_team_id int not null,
away_team_id int
2006 May 14
3
Strange Database Mapping Question
Dear Rails List,
I am new on the list so will assume straight away that this question has been
answered before. As I can see no immediate way of searching the list, I will
ask the question. I apologize in advance for any disruption this may cause.
Question time:
I am trying to write a web application for the staff at my office to play a
form of virtual Super14. Its a bit like any of the
2007 Oct 16
8
Using multiple foreign keys in views
I have a model, Game, that has_many :teams. There''s a home team and an
away team. I created two foreign keys, so each game can have two teams
associated with it. Here''s the Team model:
class Team < ActiveRecord::Base
belongs_to :game,
:class_name => ''Game'', :foreign_key => ''hometeam_id''
belongs_to :game,
:class_name =>
2009 Jul 29
5
[newbie] double relationships in database
I have the following tables
teams
id :string
name :string
and
matches
id:
home_team :team_id
visitor_team :team_id
how can I reflect that kind of relationship in a RoR model?
thanks and keep up the good work.
2009 Sep 28
5
Multi-databases support
Hi,
While I was hacking ovirt-server, I have found that it's currently
restricted to Postgres DB. Even if I like postgres for serious work on a
server, I really prefer to hack/dev locally on a Sqlite or MySQL DB.
I have googled on rails in order to find a good answer for the "foreign
key problem" which forces OVirt to stay on pg. I have found a plugin on
this particular
2006 Mar 11
2
assignment of parent ID in child''s fk field
When I create a child record I''m not automagically getting the parent ID put into the fk field. Does object.new take parameters that allows me to do that as part of the AR record creation? Or do I need to do it separately? Or am I missing the boat altogether ;-)
Thanks,
Bill
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2005 Jun 27
9
FK constraints overrated?
Hello folks,
I use to think that a relational databases without foreign keys
constraints enforced strictly by the RDBMS were no good, piece of crap,
data junk.
However, I''ve also learned the hard way that FKs constraints imposes
serious difficulties when moving data around, specially between
different DBs, or for loading test data or for upgrading DBs schemas, or
for porting DBs
2006 Jan 05
13
Naming convention for foreign keys
Hi,
In "Agilge Web Development With Rails" on page 217, an example of
foreign keys is shown.
I am however unable to find a definition of wheater the naming of the
index is significant. On the above mentioned page, this line is shown in
the example:
constraint fk_items_product foreign key (product_id) references
products(id)
In "fk_items_product", "items" is
2009 Oct 08
6
Eager Loading a Relationship That Has No PK/FK
I''m attempting to wrestle an old DB into Rails.
This relationship is giving me trouble:
class Show < AR::Base
has_many :segments
end
class Segment < AR::Base
belongs_to :show
has_one :media #this has no PK/FK relation
end
A Segment is "linked" to Media by Media.name, which is the result of
concatenating Segment.name and Segment.part. As I said there are is no
2006 Jan 04
8
Trying to display data from two tables
Alrighty folks, I''m really trying here, and want to succeed with Ruby on
Rails.
I''m trying to display data that is linked from two tables using the
Active Record naming conventions, as described in Agile Web book.
The stripped-down basics;
Database
drop table if exists people;
CREATE TABLE `people` (
`id` int(6) NOT NULL auto_increment,
`lastname` varchar(30) NOT NULL,
2006 Jan 09
3
Include with two references of one model of the same table
Hey guys,
I just came across this oddity, not sure what to make of it yet, but
I think it might be incorrect behavior. When doing a @inst.find(:all,
:include => ["hometeam", "awayteam"] ...) hometeam and awayteam are two
references from a belongs_to that is of the same model and of the same
table. I will get a pgerror stating that "matches", which is
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
2011 Feb 26
1
How to manage the form of a model that has two foreign keys
Hi,
Basically I have two models: User and Godfather. The godfather table
has three columns:
- user_id (FK --> User)
- user_godfather_id (FK --> User)
- description (text)
Inside each model class, I am adding the following associations:
class User < ActiveRecord::Base
has_many :godfathers # for user_id
has_many :godfathers, :foreign_key =>
2005 Dec 16
6
managing belongs_to fields in a form
Hi all,
I cannot find a clean way to create/edit an object that ''belongs_to''
another one, just by using form fields.
I always need to explicitely unassemble it, store the master id in a
hidden field, and then refetch the master from its id, and put it back
in the object.
To summarize:
I want to create a new member, for a given project
@project= ...
@member =
2006 Jan 10
0
bug? : STI and :include => fk and class_name MUST be specified
I suspect this is a bug. Or a limitation.
Problem:
----------------
When you include a STI class in a ''find'' :
@results = Result.find :all, :include => :event
, you are forced to specify the fk and the class name :
belongs_to :event , :class_name => "Event", :foreign_key =>
"event_id"
.
Full code:
-----------
class Event <
2007 Jan 31
0
radio buttons => What if the value is a FK?
Hi:
I have radio buttons like this in my view:
<%= radio_button :goals, :goaltype_id, ''Recurring'', { :onclick => "new
Effect.SlideDown(''recurring''); return false;" }
%> Recurring<br />
<%= radio_button :goals, :goaltype_id, ''One-time'', { :onclick => "new
2006 May 26
0
has_and_belongs_to_many with fk constraints?
Hi folks,
I''m wondering if it''s possible to use foreign key constraints on the join
tables of a has_and_belongs_to_many relation. Specifically, I get this
error when I try and delete a model I''m using, named saved_search, which is
many-to-many with neighborhoods. Any ideas? Thanks for any help. :-)
-Eric
Code:
@saved_search.destroy
Error:
Mupdate or delete on
2006 May 28
1
ActiveRecord: FK constraints problem
Hi all.
I have has_and_belongs_to_many association between models: Section and
Content.
class Section < ActiveRecord::Base
acts_as_tree
has_and_belongs_to_many :contents
belongs_to :default_content, :class_name => ''Content'', :foreign_key =>
''default_content_id'', :dependent => :nullify
end
class Content < ActiveRecord::Base
belongs_to
2006 Oct 20
0
FK references in DBDesigner4?
I seem to have trouble getting DBD4 to create ActiveRecord-compatible
DDL statements. I have a database with a series of 1:n relationships
which should be easy to model. But, depending on the relationship type
I use, when I connect them in the ERD it either:
1) starts cascading foreign keys like an avalanche, or
2) fails to add ''contraint fk_xxx foreign key (yyy) references
2006 Aug 23
1
problems with Oracle: FK, triggers
Hi All!
Is anyone working with Oracle on Rails? What about testing? I will be
very happy if you can help me:
1) When I run rake test:unit it removes all my sequences in test
enviroment. And I get an error like "OCIError: ORA-02289: sequence does
not exist" But when I run rake db:test:clone_structure I can see all
sequences again. Where is a problem?
2) How I can take proper