Comments (4)
For what it's worth, this was very unexpected behavior to me:
class A < Dry::Struct
attribute :id, Types::Strict::Integer
attribute :type, Types::Strict::String
attribute :name, Types::Strict::String
end
class B < Dry::Struct
attribute :id, Types::Strict::Integer
attribute :type, Types::Strict::String
attribute :name, Types::Strict::String
attribute :primary_function, Types::Strict::String.optional
end
class WithSum < Dry::Struct
attribute :sum, A | B
end
WithSum.new(
sum: B.new(
id: 123,
type: 'foo',
name: 'bar',
primary_function: 'yo'
)
) # => #<WithSum sum=#<A id=123 type="foo" name="bar">>
I expected it to return my instance of B
, not A
.
A nice first step, would be to at least document how sum types work.
But I wonder if it's intended to work this way too.
from dry-struct.
Thank you for the context @flash-gordon 🙏.
And thanks for the suggestion. I solved our case with constrained types:
Types::Strict::String.constrained(eql: 'my_type')
from dry-struct.
But I wonder if it's intended to work this way too.
The problem lies in implicit coercion with to_hash
. B
gets coerced to a hash and to an A
in order. It wasn't a good design choice. You can reject extra key by making the schema strict with schema schema.strict
:
class StrictStruct < Dry::Struct
schema schema.strict
end
class A < StrictStruct
attribute :id, Types::Strict::Integer
attribute :type, Types::Strict::String
attribute :name, Types::Strict::String
end
class B < StrictStruct
attribute :id, Types::Strict::Integer
attribute :type, Types::Strict::String
attribute :name, Types::Strict::String
attribute :primary_function, Types::Strict::String.optional
end
class WithSum < Dry::Struct
attribute :sum, A | B
end
This will still coerce data internally but these attempts will fail. I think we'll remove to_hash
in 2.0.
from dry-struct.
Yeah, I do something similar to discriminate variants. 👍
from dry-struct.
Related Issues (20)
- Does not create an accessor method when method exists into the mother class HOT 5
- Error while using optional on Dry::Struct HOT 4
- Sum operator not working when default values are defined HOT 4
- Instance method name attribute not available HOT 1
- Compose transforms HOT 2
- Subclasses don't recognize properly when attribute described as Types::Array.of(Parent)
- Missing attribute and maybe type HOT 4
- Expanding array item type in generated schema HOT 2
- `define_accessors` eval block consumes nonsensical values
- MissingAttributeError when access optional field with hash syntax
- Assigning nil to attribute returns hash if attribute struct has optional attibutes only HOT 3
- Errors in structs nested inside a Types::Hash raise as `#<NoMethodError: undefined method 'message' for #<String` instead of Dry Errors with the actual message HOT 1
- Struct with optional nested struct requires key in nested struct HOT 2
- [Security] Workflow ci.yml is using vulnerable action actions/checkout
- [Security] Workflow ci.yml is using vulnerable action actions/checkout
- Dry::Struct by including module HOT 1
- Release 1.5.0 breaks rails app boot with eager-loading HOT 8
- Nested optional struct does not inherit `transform_keys(&:to_sym)` HOT 3
- `Dry::Types::ConstraintError` not propagated when originating from inside a `Dry::Types::Map`
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from dry-struct.