Enhance support for collection types

[sunng87]

A further step for supporting collection types like Vec or HashMap is to generate insertion function for its content types. This allows user to create collection in a declarative manner.

For Example:

#[derive(Builder)]
pub struct Group {
  members: Vec<User>
}

Generated builder contains a function called push_member, by which you can

builder.
  .push_member(user1)
  .push_member(user2)

[TedDriggs]

Have you looked at the each setter options?

[sunng87]

Cool. That seems to be my need. I'll do some experiment with it and come back to you later.

[sunng87]

It works! Thank you for your response.

[DontBreakAlex]

I'm sorry to dig up this issue, but has this feature been removed ? I can't find any mention of each in the docs and this doesn't build:

error: Unexpected meta-item format `word`
  --> src/parse.rs:17:22
   |
17 |     #[builder(setter(each))]
   |                      ^^^^

[TedDriggs]

Still exists, it just doesn't support that format - that's why the error says "unexpected format" and not "unknown field"

Usage is here