this post was submitted on 23 Sep 2024
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Rust Programming

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Which of these code styles do you find preferable?

First option using mut with constructor in the beginning:

  let mut post_form = PostInsertForm::new(
    data.name.trim().to_string(),
    local_user_view.person.id,
    data.community_id,
  );
  post_form.url = url.map(Into::into);
  post_form.body = body;
  post_form.alt_text = data.alt_text.clone();
  post_form.nsfw = data.nsfw;
  post_form.language_id = language_id;

Second option without mut and constructor at the end:

  let post_form = PostInsertForm {
    url: url.map(Into::into),
    body,
    alt_text: data.alt_text.clone(),
    nsfw: data.nsfw,
    language_id,
    ..PostInsertForm::new(
      data.name.trim().to_string(),
      local_user_view.person.id,
      data.community_id,
    )
  };

You can see the full PR here: https://github.com/LemmyNet/lemmy/pull/5037/files

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[–] al4s 6 points 3 months ago (1 children)

Yeah if you have the second option, use it, but if the struct has private fields it won't work.

[–] taladar@sh.itjust.works 2 points 2 months ago (1 children)

The first one won't work either for private fields.

[–] al4s 2 points 2 months ago (1 children)

You can have setters that set private fields, there are also sometimes structs with mixed private and public fields

[–] taladar@sh.itjust.works 1 points 2 months ago (1 children)

But why not use a proper builder pattern in that case?

[–] al4s 2 points 2 months ago

Because you don't control third party libraries