Rails - Jan 2007 - Self Referential HABTM Checkbox Example or Tutorial Needed

My checkboxes currently show up either checked or not checked based on
manually entered data using this bit so far..

<% Project.find(:all).each do |project| %>
  <input type="checkbox" id="<%= project.id %>"
name="project_ids[]"
value="<%= project.id %>"<% if
@project.cross_reference.include? project
%> checked="checked"<% end %>> <%= project.name %>

I have projects that relate to other projects in a cross_reference table
with rows for project_id and cross_reference_id.

My manually enter values can be retrieved but I can''t figure out how to
write the values to the cross_reference table from a web form.

Any reference or guidance appeciated.

Thanks,
DAN

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Just a suggestion: use has_many :through instead. habtm is kinda
deprecated, at least partly.

On Jan 20, 11:16 am, DAN
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> My checkboxes currently show up either checked or not checked based on
> manually entered data using this bit so far..
>
> <% Project.find(:all).each do |project| %>
>   <input type="checkbox" id="<%= project.id
%>" name="project_ids[]"
> value="<%= project.id %>"<% if
@project.cross_reference.include? project
> %> checked="checked"<% end %>> <%= project.name
%>
>
> I have projects that relate to other projects in a cross_reference table
> with rows for project_id and cross_reference_id.
>
> My manually enter values can be retrieved but I can''t figure out
how to
> write the values to the cross_reference table from a web form.
>
> Any reference or guidance appeciated.
> 
> Thanks,
> DAN
> 
> --
> Posted viahttp://www.ruby-forum.com/.

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Thanks for the direction.

I''ve added a cross_reference model now and in my 
models/cross_reference.rb is

has_many :projects
belongs_to :project

and my models/project.rb contains

has_many :cross_references
has_many :projects, :through => :cross_references

I''m able to show manually entered data, such as discriminaing which 
checkboxes for related projects should be checked - same as before, but 
now using the code in my project form partial

<% Project.find(:all).each do |project| %>
  <input type="checkbox" id="<%= project.id %>"
name="project_ids[]"
value="<%= project.id %>"<% if @project.projects.include?
project %>
checked="checked"<% end %>> <%= project.name %><br
/>
  <% end %>

I''m still stuck on trying to save (via my project edit or update 
methods) to my cross_references table though.

I believe I need some statements in my project_controller.rb new, 
create, and update methods such as:

def project_new
    @project = Project.new
    @cross_references = CrossReference.find(:all)
end

def project_create
    @project = Project.new(params[:project])
    @project.cross_references = 
CrossReference.find(@params[:cross_reference_ids]) if 
@params[:cross_reference_ids]
end

def project_edit
    @project = Project.find(params[:id])
    @cross_references = CrossReference.find(:all)
end

def project_update
    @project = Project.find(params[:id])
    @project.cross_references = 
CrossReference.find(@params[:cross_reference_ids]) if 
@params[:cross_reference_ids]
end

I hope I''m poviding enough information. It would be great to understand
how the create these kind of relationships.

DAN


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I dunno if this helps you, but in HowTo:
http://wiki.rubyonrails.com/rails/pages/Howtos
you will find a document about many to many relations.

Besides, in
http://www.fallenrogue.com/article/view/143-I-am-what-I-am-or-self-referential-joins-in-Rails
you will find an example on self-referential joins...


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