I am working on a module that interacts with components of an existing
database with tables: `Brand`, `Model`, `Submodel` and came across an issue
while defining an association.
Generally speaking, my models look like this:
module COC
class Brand < Sequel::Model
one_to_many :models
end
class Model < Sequel::Model
many_to_one :brand
one_to_many :submodels
end
class Submodel < Sequel::Model
many_to_one :model
end
end
I was hesitant to use the class name `Model`, but largely it has been
working as expected. My issues came about when trying to create instances
of `Submodel`, and it seems to be caused by the association setup:
many_to_one :model
With that line, I am unable to create new instances of the model that are
sensible, and I suspect it's tied to the usage of trying to associate
`:model`. If it's commented out, the model works as expected.
Is there an alternate way to specify the `one_to_many` call that will allow
me to target my `Model` class? Or must I rename the class?
Here's some code that led me to this:
[112] pry(main)> model.add_submodel attributes
NoMethodError: undefined method `setter_methods' for nil:NilClass
from
/home/ttilberg/.rvm/gems/ruby-2.2.5/gems/sequel-4.49.0/lib/sequel/model/base.rb:2494:in
`setter_methods'
[113] pry(main)> wtf?
Exception: NoMethodError: undefined method `setter_methods' for nil:NilClass
--
0: /home/ttilberg/.rvm/gems/ruby-2.2.5/gems/sequel-4.49.0/lib/sequel/model/
base.rb:2494:in `setter_methods'
1:
/home/ttilberg/.rvm/gems/ruby-2.2.5/gems/sequel-4.49.0/lib/sequel/model/base.rb:2463:in
`set_restricted'
2:
/home/ttilberg/.rvm/gems/ruby-2.2.5/gems/sequel-4.49.0/lib/sequel/model/base.rb:1852:in
`set'
3: /home/ttilberg/.rvm/gems/ruby-2.2.5/gems/sequel-4.49.0/lib/sequel/model/
base.rb:2421:in `initialize_set'
4:
/home/ttilberg/.rvm/gems/ruby-2.2.5/gems/sequel-4.49.0/lib/sequel/model/base.rb:1440:in
`initialize'
5:
/home/ttilberg/.rvm/gems/ruby-2.2.5/gems/sequel-4.49.0/lib/sequel/model/associations.rb:2480:in
`new'
6: /home/ttilberg/.rvm/gems/ruby-2.2.5/gems/sequel-4.49.0/lib/sequel/model/
associations.rb:2480:in `make_add_associated_object'
7:
/home/ttilberg/.rvm/gems/ruby-2.2.5/gems/sequel-4.49.0/lib/sequel/model/associations.rb:2352:in
`add_associated_object'
8:
/home/ttilberg/.rvm/gems/ruby-2.2.5/gems/sequel-4.49.0/lib/sequel/model/associations.rb:1942:in
`block in def_association_instance_methods'
[16] pry(main)> COC::Submodel.new params
NoMethodError: undefined method `setter_methods' for nil:NilClass
from
/home/ttilberg/.rvm/gems/ruby-2.2.5/gems/sequel-4.49.0/lib/sequel/model/base.rb:2494:in
`setter_methods'
[22] pry(main)> submodel = COC::Submodel.new
[23] pry(main)> submodel.set params
NoMethodError: undefined method `setter_methods' for nil:NilClass
from
/home/ttilberg/.rvm/gems/ruby-2.2.5/gems/sequel-4.49.0/lib/sequel/model/base.rb:2494:in
`setter_methods'
[24] pry(main)> wtf???
Exception: NoMethodError: undefined method `setter_methods' for nil:NilClass
--
0: /home/ttilberg/.rvm/gems/ruby-2.2.5/gems/sequel-4.49.0/lib/sequel/model/
base.rb:2494:in `setter_methods'
1:
/home/ttilberg/.rvm/gems/ruby-2.2.5/gems/sequel-4.49.0/lib/sequel/model/base.rb:2463:in
`set_restricted'
2:
/home/ttilberg/.rvm/gems/ruby-2.2.5/gems/sequel-4.49.0/lib/sequel/model/base.rb:1852:in
`set'
[31] pry(main)> submodel.url = 'tim'
NoMethodError: undefined method `db' for nil:NilClass
from
/home/ttilberg/.rvm/gems/ruby-2.2.5/gems/sequel-4.49.0/lib/sequel/model/base.rb:2527:in
`typecast_value'
This object looks different than a normal new `Sequel::Model` -- it's
missing @values.
[5] pry(main)> COC::Submodel.new
=> #<COC::Submodel:0x1fb02ec>
With the association line commented out, the class initializes with
`@values` and works as usual.
[9] pry(main)> COC::Submodel.new
=> #<COC::Submodel @values={}>
I fear the answer to this question will simply be "Don't use the class name
`Model`" -- I'd like to avoid this, as the word Model is the most
meaningful in our context, and is largely established in the greater system.
Thank you for reading!
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