datasources-postgres 0.1.51

Postgres datasource provider
Documentation 
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use datasources::{Result, TypeConverter, Value};

pub struct IntegerConverter;

impl TypeConverter<Value, Value> for IntegerConverter {
    fn convert(&self, from: &Value) -> Result<Value> {
        Ok(match from {
            Value::Text(text) if text.is_empty() => Value::Int(0),
            Value::Text(text) => text
                .parse::<i64>()
                .map(Value::Int)
                .unwrap_or_else(|_| from.clone()),
            other => other.clone(),
        })
    }

    fn reverse_convert(&self, to: &Value) -> Result<Value> {
        Ok(to.clone())
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn maps_integer() {
        let converter = IntegerConverter;
        assert_eq!(converter.convert(&Value::from("10")).unwrap(), Value::Int(10));
        assert_eq!(converter.convert(&Value::from("")).unwrap(), Value::Int(0));
        assert_eq!(converter.convert(&Value::Int(7)).unwrap(), Value::Int(7));
        assert_eq!(converter.reverse_convert(&Value::Int(7)).unwrap(), Value::Int(7));
    }
}