I'm working with a pre-defined database, datamapper and rails3.
Previously we've used a php front end to manage the system.
In the process of migrating to a RoR application, I've run into issues
with my many to many relationships.
I've been following [this tutorial][1] to try and get things working
but still cannot get it sorted.
Relationships are as follows:
Radcheck have and belong to many Groups through Radusergroup
Groups have and belong to many Radcheck through Radusergroup
I have this in my models:
class Radcheck
include DataMapper::Resource
has n, :radgroups, :model => 'Group', :child_key =>
[:groupname], :parent_key => [:username], :through => :radusergroup
end
--
class Group
include DataMapper::Resource
has n, :radusers, :model => 'Radcheck', :child_key =>
[:groupname], :parent_key => [:name], :through => :radusergroup
end
--
class Radusergroup
include DataMapper::Resource
belongs_to :radusers, :model => 'Radcheck', :child_key =>
[:username]
belongs_to :radgroups, :model => 'Group', :child_key =>
[:groupname]
end
My radusergroup table looks like this:
+-------------+------------+----------+
| username | groupname | priority |
+-------------+------------+----------+
| silverxxxx | silverxxxx | 1 |
| shushxx | 30-minutes | 0 |
| jennybluntx | silverxxxx | 1 |
+-------------+------------+----------+
However, when I start the server, I'm presented with this error:
/usr/local/lib/ruby/gems/1.9.1/gems/dm-core-1.2.0/lib/dm-core/
associations/many_to_many.rb:101:in `via': No relationships named
radusers or raduser in GroupRadcheck
(DataMapper::UnknownRelationshipError)
I thought this method would define the table properly but can see it's
still trying to call it GroupRadcheck
[1]:
http://invalidlogic.com/2010/01/27/named-many-to-many-relationships-in-datamapper/
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