hi all, i'm new to datamapper and i can't figure out how associations
naming works.
consider the following model (just an example):
class Author
include DataMapper::Resource
property :id, Serial
property :name, String
has n, :books,
:through => Resource,
:class_name => "Book",
:child_key => [:book_id]
end
class Book
include DataMapper::Resource
property :id, Serial
property :name, String
has n, :authors,
:through => Resource,
:class_name => "Author",
:child_key => [:author_id]
end
DataMapper::auto_migrate!
that works fine, so that i can run this:
author = Author.create(:name => 'john')
book = Book.create(:name => 'cooffe')
book1 = Book.create(:name => 'milk')
author.books << book
author.books << book1
author.save
book.save
book1.save
author.books.each { |e| puts e.name }
ok. now comes the problem. i want the association in class Author to
be called something else then 'books', say 'foobar', so that i can
run:
author.foobar << book
a natural approach, from what i can infer from documentation, would be
to pass the desidered name as a symbol to method #has inside class
Author definition, like this:
class Author
has n, :foobar, # <- HERE
:through => Resource,
:class_name => "Book",
:child_key => [:book_id]
end
that sadly doesn't work. instead it yields this error:
ArgumentError: +options[:links]+ entry nil not supported
which i find not very informative.
would you please provide some insight?
thanks
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