Rails - Mar 2007 - MTM relationship with relationship attributes

I have following many to many relationship:
class Service < ActiveRecord::Base
has_many :service_dependencies
has_many :dependents, :through => :service_dependencies
end

class ServiceDependency < ActiveRecord::Base
belongs_to :service
belongs_to :dependent, :class_name => ''Service'',
:foreign_key =>
''dependent_service_id''
end

However, in my schema the MTM table service_dependencies has few
relationship attributes as well, e.g. impact, severity, etc. along
with the foreign keys.

Right now, I''m displaying the dependent services'' fields in
following
manner:
<%=h dependents.send("service_name") %>

<% for dependents in @service.dependents %>
     <b>Service Name:</b><br> <%=h
dependents.send("service_name")
%><br>
<% end %>

I also want to display the relationship attributes, could someone
please help me by letting me know how to access them in my view page?


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Hi,

I found out the solution myself by refering to several examples and 
forums. It is as easy as this:

<% for dependent in @service.dependents %>
      <b>Service Name:</b><br> <%=h
dependent.send("service_name")
%><br>
      <% dependency = @service.service_dependencies.find(:first, 
:conditions =>
            ["dependent_service_id = ?", dependent.id])%>
      <b>Impact:</b><br> <%=h
dependency.send("impact") %><br>

<%end%>

This may be helpful for some other beginner like me.

Thanks and Regards,
Vishu


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Vishwaraj wrote:
> Hi,
> 
> I found out the solution myself by refering to several examples and 
> forums. It is as easy as this:
> 
> <% for dependent in @service.dependents %>
>       <b>Service Name:</b><br> <%=h
dependent.send("service_name")
> %><br>
>       <% dependency = @service.service_dependencies.find(:first, 
> :conditions =>
>             ["dependent_service_id = ?", dependent.id])%>
>       <b>Impact:</b><br> <%=h
dependency.send("impact") %><br>
> 
> <%end%>
> 
> This may be helpful for some other beginner like me.
Better would be

<% sds = @service.service_dependents.find(:all, :include => :dependent)
    for service_dependent in sds %>
<b>Service Name:</b><br>
<%= h service_dependent.dependent.service_name %><br>
<b>Impact:</b><br>
<%= h service_dependent.impact %><br>
<%end%>


-- 
We develop, watch us RoR, in numbers too big to ignore.


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