I'm running into issues using the lazy_attributes plugin with the
class_table_inheritance plugin and am hoping to get some help with it.
The parent table has a column that I want to lazily load. If I add the
lazy_attributes plugin to the parent class I run into errors related to the
lazy loaded column being missing. When I add it to the subclass then I lose
typecasting for all columns when setting them through the subclass.
I used postgres because sqlite is not very strict with typing and I wanted
to use the same setup for both examples.
setup:
DB = Sequel.connect "postgres://user:password@host:port/database_name"
DB.create_table :employees do
primary_key :id
column :kind, :text
column :active, :boolean
column :bio, :text
end
DB.create_table :managers do
foreign_key :id, :employees, null: false
primary_key [:id]
end
The base case without adding lazy_attributes manually works as expected
class Employee < Sequel::Model
plugin :class_table_inheritance, key: :kind
end
class Manager < Employee
end
employee = Employee.create active: 0, bio: "Superclass bio"
puts "employee's biography: #{employee.bio}"
puts "Employee 'active' was typecast -> #{employee.active}"
manager = Manager.create active: 0, bio: "Subclass bio"
puts "manager's biography: #{manager.bio}"
puts "Manager 'active' was typecast -> #{manager.active}"
Adding lazy_attributes on bio to the parent class causes reading bio to
raise an error: PG::UndefinedColumn: ERROR: column employees.bio does not
exist.
class Employee < Sequel::Model
plugin :lazy_attributes, :bio
plugin :class_table_inheritance, key: :kind
end
class Manager < Employee
end
employee = Employee.create active: 0, bio: "Superclass bio"
# superclass works
puts "Employee 'active' was typecast -> #{employee.active}"
puts "employee's biography: #{employee.bio}"
manager = Manager.create active: 0, bio: "Subclass bio"
puts "Manager 'active' was typecast -> #{manager.active}"
# subclass breaks reading bio from DB
puts "manager's biography: #{manager.bio}" # <- error raised here
Adding it to the subclass instead means active won't be typecast on set for
instances of the subclass (it raises PG::DatatypeMismatch: ERROR: column
"active" is of type boolean but expression is of type integer)
class Employee < Sequel::Model
plugin :class_table_inheritance, key: :kind
end
class Manager < Employee
plugin :lazy_attributes, :bio
end
# Typecasting works on parent
employee = Employee.create active: 0, bio: "Superclass bio"
puts "employee's biography: #{employee.bio}"
puts "Employee 'active' was typecast -> #{employee.active}"
# Typecasting doesn't work on subclass
manager = Manager.create active: 0, bio: "Subclass bio" # <- error raised
here
puts "manager's biography: #{manager.bio}"
puts "Manager 'active' was typecast -> #{manager.active}"
I'm not sure if this is a bug or user error. Any help would be much
appreciated!
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