Question regarding model with unsaved parent

[marcus-allabrf]

Here, invoice1 is the parent of invoice2:

invoice1 = Fortnox::API::Model::Invoice.new(customer_number: '1')
invoice2 = invoice1.update(due_date: '2023-01-01')

We have:

puts invoice2.customer_number # 1
puts invoice2.due_date # 2023-01-01

However, when saving invoice2:

Fortnox::API::Repository::Invoice.new.save(invoice2)

the following data is posted via POST /3/invoices/:

{"Invoice": {"DueDate": "2023-01-01"}}

but shouldn't the following data be posted or am I missing something?:

{"Invoice"=>{"CustomerNumber"=>"1", "DueDate"=>"2023-01-01"}}

[ehannes]

Hi @marcus-allabrf!

This should work, yes. I'll need to test this myself. I'll get back to you.

[ehannes]

@marcus-allabrf I've verified that this is a bug. Would you like to join the fortnox-api Slack channel and continue the discussion there? Please contact us at info@accodeing.com 😄

[marcus-allabrf]

Sure, I send you an email! 😄

[marcus-allabrf]

@ehannes Thanks for the fix 👍 . I try different edge cases in order to understand how things work. Is this still a bug related to unsaved parent?

invoice1 = Fortnox::API::Model::Invoice.new(customer_number: '1')
invoice2 = Fortnox::API::Repository::Invoice.new.save(invoice1)

invoice3 = invoice2.update(due_date: '2023-01-01')
invoice4 = invoice3.update(due_date: '2023-01-02')

puts invoice3.parent.saved? # true
puts invoice4.parent.saved? # false

Fortnox::API::Repository::Invoice.new.save(invoice3)
{"Invoice": {"DueDate": "2023-01-01"}}
Fortnox::API::Repository::Invoice.new.save(invoice4)
{"Invoice"=>{"CustomerNumber"=>"1", "DueDate"=>"2023-01-02"}} # we haven't updated customer_number

In order words, shouldn't invoice4's parent actually be invoice2 instead of invoice3 here?

[ehannes]

@marcus-allabrf looks like another bug, yes. I'll reopen this issue since it's not completely resolved yet.

[d-Pixie]

No, this is not a bug.

invoice2 is saved. invoice3 is based on that, with a change, and is hence not saved. invoice4 is based on invoice3, which is not saved, so its parent is not saved.

[marcus-allabrf]

I thought the purpose of parent was that when we do update_existing(entity), we get the state of the entity from the previous save and we can then do @mapper.diff(hash, parent_hash) to know which attributes to update. But if invoice4.parent.saved? is false, we will always update all attributes (even "CustomerNumber" in this case that has not been updated) due to return hash unless entity.parent.saved?.

[d-Pixie]

To be honest the above example is a bit outside of what we considered when we designed the initial version of the gem. Version 1 - which is coming in not too distant future - solves this problem in a different way and avoids the issue altogether.

I'll leave it up to @ehannes if he wants to fix it for the "legacy" version 🙂

[marcus-allabrf]

Great that it will be solved in Version 1. 👍