rwf 0.2.1

Framework for building web applications in the Rust programming language
Documentation 
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//! `$1`, `$2`, etc. query placeholders used by prepared statements.
use super::Value;

#[derive(Debug, Clone, Default)]
pub struct Placeholders {
    values: Vec<Value>,
}

impl Placeholders {
    pub fn new() -> Self {
        Self { values: vec![] }
    }

    pub fn add(&mut self, value: &Value) -> Value {
        let id = self.values.len() + 1;
        self.values.push(value.clone());
        Value::Placeholder(id as i32)
    }

    pub fn get(&self, index: i32) -> Option<&Value> {
        self.values.get(index as usize - 1)
    }

    pub fn values(&self) -> Vec<&(dyn tokio_postgres::types::ToSql + Sync)> {
        self.values
            .iter()
            .map(|v| v as &(dyn tokio_postgres::types::ToSql + Sync))
            .collect()
    }

    pub fn id(&self) -> i32 {
        self.values().len() as i32 + 1
    }
}

impl From<Vec<Value>> for Placeholders {
    fn from(values: Vec<Value>) -> Self {
        Placeholders { values }
    }
}