How do I ignore some fields of a struct

help
#1 
use serde::{Deserialize, Serialize};

#[derive(Clone, Debug, PartialEq, Deserialize, Serialize)]
pub struct InstitutionObject {
    // 雪花id
    #[serde(default)]
    pub id: String,
    // 核酸结果（0-阴性 1-阳性 2-无效）
    #[serde(default)]
    pub result_type: i32,
    // 检测机构id
    #[serde(default)]
    pub institution_id: String,
    // 核酸登记id
    #[serde(default)]
    pub registe_id: String,
    // 创建时间
    #[serde(default)]
    pub create_time: String,
}

#[allow(dead_code)]
impl InstitutionObject {
    pub fn new(id: String, result_type: i32, institution_id: String, registe_id: String, create_time: String) -> InstitutionObject {
        InstitutionObject {
            id,
            result_type,
            institution_id,
            registe_id,
            create_time,
        }
    }

    pub fn tets(id: String, result_type: i32, institution_id: String) -> InstitutionObject {
        InstitutionObject {
            id: id, 
            result_type: result_type,
            institution_id: institution_id,
        }
    }
}

This code can't be compiled. If I can't ignore it, I have to declare another struct

#2

I don't want to declare a struct again. In fact, I can create multiple view objects or business object according to requirements by creating an instance

#3

I didn't find similar instructions on this official website struct

#4

There are two things you can do:

  • Set the type of certain fields, which are optional as Option<String> for create_time.
  • Create a top-level enum, with different variants for different "things"
enum Institute {
    Regular(RegularInstitute),
    Unregistered(UnregisteredInstitute)
}

Use the former if you have an object which may exist in various "states" - such as initially all institutes are unregisterered, then they get registered.
Use the latter is un-registered institutes and registered institutes both exist and are distinct.

#5

Can't you make the fields optional by using the Option type?

#6

Do you mean i can set the none property for it, In case of no value

#7

thanks

    #[serde(default)]
    pub registe_id: Option<String>,
    // 创建时间
    #[serde(default)]
    pub create_time: Option<String>,

 pub fn tets(id: String, result_type: i32, institution_id: String) -> InstitutionObject {
        InstitutionObject {
            id: id, 
            result_type: result_type,
            institution_id: institution_id,
            registe_id: None,
            create_time: None,
        }
    }

#[cfg(test)]
mod tests {
    use std::{cell::RefCell, rc::Rc};

    use super::*;

    #[test]
    fn test_ingore_param() {
        let a = RefCell::new(Rc::new(InstitutionObject::tets(String::from("4"), 6, String::from("7"))));

        println!("{:?}", a);
    }
}

When I print the field, I look at it and return None, but I accept it at the front end. I don't want this field to appear. it can be ignored during serialization

#8

Maybe a top-level enum is a good choice. I'll try it later. Thank you

#9

You can skip serialization in Serde using field attributes like this:

#[serde(skip_serializing_if = "Option::is_none")]

#10

Thanks guy :+1: