has_one working?

[Bob Sleys]

Using Hobo RC3 and have the following model

class Organization < ActiveRecord::Base

  hobo_model # Don't put anything above this

  fields do

    name :string, :required, :unique

    facility  :string

    address :text

    city  :string

    state :string

    zip   :string

    phone :string

    timestamps

  end

  has_many :users, :accessible => :true

  has_one :primary_contact, :through => :users

  children :users

...

end

and I have   belongs_to :organization, :accessible => :true in the users.rb model

However the hobo g migration doesn't pick up the requirement for a primary_contact_id field in the table nor does the form try to create an input field for it.  I've tried adding the primary_contact_id to the list of fields but the auto generated form still doesn't create an input filed for it.  I know I could set it up all myself but I'm just wondering why Hobo isn't doing it automatically like a has_many

Bob

[Owen Dall]

I don't remember has_one being implemented in Hobo, and I don't remember why not. : -)

Perhaps Matt or Bryan can comment...

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Owen Dall, Chief Systems Architect

Barquin International

www.barquin.com

Cell: 410-991-0811

[Bob Sleys]

If it's not there I can do it manually it just seemed odd it wouldn't be there.  Unless I'm going about this wrong.  Is there some other way I would go about specifying something like a primary contact to an organization assuming they are one of users?

In this case an organization can have many users associated with it, standard has_many like and 1 of those users is the primary contact for the organization.  I know I'd have to tweak the selection list for the has_one at any rate to limit it to the users assocated with the organization otherwise I'd get a list of all users.

Bob

[Matt Jones]

I'm not following what you're going for here - has_one doesn't create a foreign key, especially not a :through...

A more typical way to describe this would be either with belongs_to:

class Organization < ActiveRecord::Base
...
belongs_to :primary_contact, :class_name => 'User'
end

This will give you a select-one on the forms for organization - but it won't automatically scope the selection to the :users association, and will need some extra logic to handle the "primary contact manually deleted leaving invalid primary_contact_id" situation.

An alternative would be to define a flag on User:

class User < ActiveRecord::Base
fields do
...
primary_contact :boolean, :default => false
end
end

And then a has_one association with conditions:

class Organization < ActiveRecord::Base
...
has_one :primary_contact, :class_name => 'User', :conditions => { :primary_contact => true }
end

You'll need some custom views and/or model logic to ensure that you've only got one selected at any given time.

--Matt Jones

[Bryan Larsen]

On Fri, Oct 28, 2011 at 10:09 AM, Owen Dall <od...@barquin.com> wrote:
> I don't remember has_one being implemented in Hobo, and I don't remember why
> not. : -)

The biggest reason is "because nobody implemented it", but the other
reason is that internally in Rails, has_one is basically a has_many
that's constrained to having 1 child, and has always been the ugly
stepchild. By now I'm sure most of the warts have been cleaned up
but certainly at some points in time it has had problems.

Bryan

[Owen Dall]

Perhaps we can revisit for Hobo 1.4.   Seems to keep coming up...

-Owen

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