Displaying 20 results from an estimated 7000 matches similar to: "newb trying to figure out ActiveRecord relationships"
2008 Jul 22
2
ActiveRecord Associations issue
Hello all and thank you for reading this message.
I am new to RoR, and ruby too, but i am quite excited about it.
I am developing a RoR project and with active record associations in
the following
manner
# Tables (all tables have only one record)
CREATE TABLE `webcars_development`.`cars` (
`id` int(11) NOT NULL auto_increment,
`model_id` int(11) NOT NULL default ''0'',
2012 Mar 28
1
collection_select
_form.html.haml
= f.label :Select_Brand, "Select_Brand<em>*</em>".html_safe
= collection_select(:brand_name, :brand_id, Brand.all, :id, :name,
:prompt => "Select a Brand" )
show.html.haml file
%table
%tr
%td
Brand_Name :
%td
= @message.brand_id
After writing this code I am not able to see the brand name. Its not
giving any error but
2009 Jun 02
9
XML::LibXML::Reader
is there anybody who knows how we can get child values using libxml
(Reader class)
def xml_import_to_brands
require''xml''
reader = XML::Reader.file(''c:/brands.xml'')
.
.
.
2006 Sep 28
15
Inserting rows into linking table
Hi,
I have two objects:
Contacts
Lists
I want to be able to add multiple contacts to multiple lists.
I''ve created a linking table and a form that allows me to select the
contacts using checkboxes, but I''m having some problems with the
controller and model.
I receive the following error message when I submit the form:
Mysql::Error: Cannot add or update a child row: a
2006 Aug 09
1
Migrating a Field to External Model
I have a model Product with an attribute ''brand''. Currently it is a
simple attribute, however, I am migrating it to a separate model
Brand so that I can have other attributes with each brand. I created
the the model and created and ran the migration to create the new
table. So far so good. Then I created a separate migration to
transfer the data. The up method
2009 Jul 23
11
Problem with named_scope
Here are my scopes:
default_scope :order => ''posted_on DESC'', :conditions => { :status =>
''visible'' }
named_scope :positive, :conditions => { :rating => ''positive'', :status
=> ''visible'' }
named_scope :neutral, :conditions => { :rating => ''neutral'', :status
=>
2007 Mar 28
4
Disabling ActiveRecord "type" column subclassing
Hi! I have a legacy table that has a column named "type" and need to
remove this automatic subclassing by ActiveRecord. The api pages are
vague about this, and I tried
self.inheritance_column = "xtype"
which seemed to get me half-way. In the validate_on_create method, the
value of self.type was my model Class name.
How would you disable this feature?
--
Posted via
2012 Aug 31
3
Feature Request: Auto-infer .includes from .where with ActiveRecord queries
In the following snippet, can''t the includes being inferred from the where
clause?
Order.includes(:items).where(:items => { :category => [1,2,3] })
Can''t the includes be inferred from the where clause?
Order.where(:items => { :category => [1,2,3] })
Would this conflict with any existing usages of the where clause and
hashes?
--
You received this
2011 Feb 17
1
Select distinict on not chainable with order method
Hi.
I would like to do code refactoring:
@beers = []
Beer.all.each do |beer|
unless @beers.find{|c| c.brand_id == beer.brand_id}
@beers << beer
end
break if @beers.size > 29
end
So I achieved this by writing scope (on PostgreSQL):
scope :with_unique_brand, select("DISTINCT ON (beers.brand_id)
beers.*")
Using this scope alone is working
2006 Mar 29
3
Self-referential many-many joins with :through
I thought I had this nailed but.. now I''m seeing spots..
I''ve included my models below, feel free to ignore them. I''m really
just after an example that works. I couldnt find one on the wiki...
which is fair enough considering Ricks patch:
http://dev.rubyonrails.org/changeset/4022 that fixed them only went
through 5 days ago..
Cheers
-henster
2006 Jun 03
8
confused about ActiveRecord relationships
I am very confused about where to put the belongs_to and the has_one
(and other relationship identifiers). I have read the RDoc and the
agile book many times about this and I think i still see it backwards.
Let me outline my app so you have an understanding...
I have 2 tables:
Schools { id, school_name, address_id }
and
Addresses { street1, street2, city, state, zip, country }
*** this
2006 Jul 15
1
Relationship problem, newbie problem, need help!!
Hey all
I seem to be having some problems with my relationship between a few
tables...
If i then run the following query in mysql, i get the data i want. How
do i do this in rails relationships and models?
select * from shop_addresses
left join shops on shops.id = shop_addresses.shop_id
left join styles on styles.id = shops.style_id
where shop_uri = ''127.0.0.1''
Cheers!!
2013 Jan 25
3
how to delete the null elements in list
HI,
I have the list:
> suu
[[1]]
NULL
[[2]]
NULL
[[3]]
item_id prod
1 2
[[4]]
item_id prod
1 2
2 4
how to delete all "NULL" elements from suu to get only
>suu
[[3]]
item_id prod
1 2
[[4]]
item_id prod
1 2
2 4
??
Kind regards,
Tammy
[[alternative HTML version deleted]]
2006 Apr 10
4
Many To Many''s Join table attributes + migrations
Hi all,
just joined and have only just kicked off with Rails (coming, but not
departing, from WebObjects development). And so far there seems to be
a lot of promise except for one thing I can''t figure out as yet --
the above problem.
Say I have the following conceptual relationships:
ITEMS <<--->> CARTS
i.e., each item can belong to one or more categories. So really
2006 May 16
9
Array in database?
Hello, I wanted to know how to make an aray in the database. I''m making
a "backpack" for my game. So i''m gana use it in a array.
--
Posted via http://www.ruby-forum.com/.
2006 Apr 18
6
Postgresql and ActiveRecords problems
Hi all. I have a problem with postgresql PK columns and ActiveRecord.
The error is: PGError: ERROR: null value in column "item_id" violates
not-null.
Ok, it''s wrong to insert NULL into PK columns, but rails doing it. How
to fix? So sad..
2008 Jan 13
3
right usage of bdrb
Hi,
i''m going to implement a syndication-service, which will get lists in
xml with some meta-data an enclosed video files, which will get encoded
at the end. The syndication run will be startet every five minutes of
a full hour.
So i thought to build 4 Worker. One for checking which feeds to
syndicate (syndication_worker) at a specific time, one for processing
the list
2006 Jan 05
2
Rails Newb: Foreign Key Views?
I''m a total rails newbie, but I''m learning fast. I have a question that
I can''t seem to find an answer for:
What is the best way of coding views that represent foreign key
relationships?
For example, while developing, I''ve created an "articles" table. I
create some scaffolding code and modify it all to look nice. I then
realise, I need an
2006 Dec 11
2
join and sort on 'best match'
Hi Everybody,
I have been breaking my head on the following problem: how to join 2
tables and sort the results on the best match.
explanation:
- there are 3 tables, items, tags and items_tags. The items_tags table
links items to tags.
- I have one item which has certain tags, and I want to look up all the
other items that have those tags as well
- results should be sorted and presented by
2007 May 28
5
CTI in ActiveRecord
I search an plugin or gem, but don''t find nothing satisfactory. I
believe to be stranger a technology that nails the DRY, have that create
you vary equal tables, instead of using inheritance.
Exists an soluction for this? I want a solution similar to this:
create_table :people |t| do
t.column :name
t.column :address
end
create_table :customer |t| do
t.column :person_id