Currently, Sequel allows the creation of model subclasses even if the
related database table does not exist.
Unfortunately, this hides bugs. For example, if you do:
class Foo < Sequel::Model
end
and the foos table does not exist, no error is generated until you actually
try to use the Foo model.
The historical reason for this is to allow set_dataset to work after
defining the model class:
class Foo < Sequel::Model
set_dataset :my_foo
end
Also, it allows the (already deprecated) schema plugin to work:
class Foo < Sequel::Model
plugin :schema
create_table?(:my_foo) do
primary_key :id
String :bar
end
end
For a long time, it's been recommended to use the following format when you
need to override the table name instead of calling set_dataset after
creating the class:
class Foo < Sequel::Model(:my_foo)
end
And if you need to modify the schema, it has been recommended for a long
time to do it before defining the model:
DB.create_table?(:my_foo) do
primary_key :id
String :bar
end
class Foo < Sequel::Model(:my_foo)
end
This ensures that when the class is created, the appropriate table exists
and the table is actually usable.
Sequel has supported requiring a valid table at model class creation time
since 4.33.0, via:
Sequel::Model.require_valid_table = true
I am considering requiring a valid table by default in Sequel 5, and having
users do "Sequel::Model.require_valid_table = false" if they want the
current behavior. I would like some feedback from the community before
making a final decision.
Thanks,
Jeremy
P.S. Note that this does not affect anonymous class creation (for abstract
model base classes):
BaseClass = Class.new(Sequel::Model)
as Sequel doesn't not attempt to assign a dataset to the class in that case.
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