arel 0.2.0

a sql orm base sqlx
Documentation 
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use super::Value;

#[derive(Clone, Debug, PartialEq)]
pub enum ActiveValue<V>
where
    V: Into<Value> + Clone,
{
    Changed(V, Option<Box<ActiveValue<V>>>),
    Unchanged(V),
    NotSet,
}

impl<V> ActiveValue<V>
where
    V: Into<Value> + Clone,
{
    /// # Examples
    ///
    /// ```
    /// use arel::prelude::*;
    /// let active_value = ActiveValue::set(1);
    /// assert_eq!(active_value, ActiveValue::Changed(1, None));
    ///
    /// ```
    pub fn set(v: V) -> Self {
        Self::Changed(v, None)
    }
    ///
    /// # Examples
    ///
    /// ```
    /// use arel::prelude::*;
    /// let mut not_set = ActiveValue::NotSet;
    /// assert_eq!(not_set.change(1), &ActiveValue::Changed(1, Some(Box::new(ActiveValue::NotSet))));
    ///
    /// let mut unchanged = ActiveValue::Unchanged(false);
    /// let old_value = unchanged.clone();
    /// assert_eq!(unchanged.change(true), &ActiveValue::Changed(true, Some(Box::new(old_value))));
    ///
    /// let mut changed = ActiveValue::Changed(1, Some(Box::new(ActiveValue::NotSet)));
    /// assert_eq!(changed.change(1), &ActiveValue::Changed(1, Some(Box::new(ActiveValue::NotSet))));
    /// assert_eq!(changed.change(2), &ActiveValue::Changed(2, Some(Box::new(ActiveValue::NotSet))));
    /// ```
    pub fn change(&mut self, v: V) -> &mut Self {
        match self {
            Self::Changed(_, ov) => {
                *self = ActiveValue::Changed(v, ov.clone());
            }
            Self::Unchanged(ov) => *self = ActiveValue::Changed(v, Some(Box::new(Self::Unchanged(ov.clone())))),
            Self::NotSet => *self = ActiveValue::Changed(v, Some(Box::new(Self::NotSet))),
        }
        self
    }
}