I came to the solution using the has_many_polymorphs plugins:
The correct modelling is:
class Relationship < ActiveRecord::Base
belongs_to :relationship_owner, :polymorphic => true
belongs_to :relationship_partner, :polymorphic => true
acts_as_double_polymorphic_join(
:relationship_owners =>[:people, :realties, :documents],
:relationship_partners => [:people, :realties, :documents]
)
end
... and the migration:
class CreateRelationships < ActiveRecord::Migration
def self.up
create_table :relationships do |t|
t.string :name
t.references :relationship_owner, :polymorphic => true
t.references :relationship_partner, :polymorphic => true
t.timestamps
end
end
def self.down
drop_table :relationships
end
end
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