arel 0.2.9

a sql orm base sqlx
Documentation 
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use crate::{ActiveValue, Value};
use std::ops::{Sub, SubAssign};

impl<V> Sub<ActiveValue<V>> for ActiveValue<V>
where
    V: Into<Value> + Copy + PartialEq + Sub<V, Output = V> + Default,
{
    type Output = Self;
    fn sub(mut self, rhs: ActiveValue<V>) -> Self::Output {
        match &mut self {
            ActiveValue::Changed(nv, ov) => match rhs {
                ActiveValue::Changed(rnv, _) => self = ActiveValue::Changed(*nv - rnv, ov.clone()),
                ActiveValue::Unchanged(rv) => self = ActiveValue::Changed(*nv - rv, ov.clone()),
                ActiveValue::NotSet => (),
            },
            ActiveValue::Unchanged(v) => match rhs {
                ActiveValue::Changed(rnv, _) => self = ActiveValue::Changed(*v - rnv, Box::new(self.clone())),
                ActiveValue::Unchanged(rv) => self = ActiveValue::Changed(*v - rv, Box::new(self.clone())),
                ActiveValue::NotSet => (),
            },
            ActiveValue::NotSet => match rhs {
                ActiveValue::Changed(rnv, _) => self = ActiveValue::Changed(V::default() - rnv, Box::new(self.clone())),
                ActiveValue::Unchanged(rv) => self = ActiveValue::Changed(V::default() - rv, Box::new(self.clone())),
                ActiveValue::NotSet => (),
            },
        };
        self
    }
}
impl<V> SubAssign<ActiveValue<V>> for ActiveValue<V>
where
    V: Into<Value> + Copy + PartialEq + Sub<V, Output = V> + Default,
{
    fn sub_assign(&mut self, rhs: Self) {
        match self {
            ActiveValue::Changed(nv, ov) => match rhs {
                ActiveValue::Changed(rnv, _) => *self = ActiveValue::Changed(*nv - rnv, ov.clone()),
                ActiveValue::Unchanged(rv) => *self = ActiveValue::Changed(*nv - rv, ov.clone()),
                ActiveValue::NotSet => (),
            },
            ActiveValue::Unchanged(v) => match rhs {
                ActiveValue::Changed(rnv, _) => *self = ActiveValue::Changed(*v - rnv, Box::new(self.clone())),
                ActiveValue::Unchanged(rv) => *self = ActiveValue::Changed(*v - rv, Box::new(self.clone())),
                ActiveValue::NotSet => (),
            },
            ActiveValue::NotSet => match rhs {
                ActiveValue::Changed(rnv, _) => *self = ActiveValue::Changed(V::default() - rnv, Box::new(self.clone())),
                ActiveValue::Unchanged(rv) => *self = ActiveValue::Changed(V::default() - rv, Box::new(self.clone())),
                ActiveValue::NotSet => (),
            },
        };
    }
}
impl<V> Sub<&ActiveValue<V>> for ActiveValue<V>
where
    V: Into<Value> + Copy + PartialEq + Sub<V, Output = V> + Default,
{
    type Output = Self;
    fn sub(mut self, rhs: &ActiveValue<V>) -> Self::Output {
        match &mut self {
            ActiveValue::Changed(nv, ov) => match rhs {
                ActiveValue::Changed(rnv, _) => self = ActiveValue::Changed(*nv - *rnv, ov.clone()),
                ActiveValue::Unchanged(rv) => self = ActiveValue::Changed(*nv - *rv, ov.clone()),
                ActiveValue::NotSet => (),
            },
            ActiveValue::Unchanged(v) => match rhs {
                ActiveValue::Changed(rnv, _) => self = ActiveValue::Changed(*v - *rnv, Box::new(self.clone())),
                ActiveValue::Unchanged(rv) => self = ActiveValue::Changed(*v - *rv, Box::new(self.clone())),
                ActiveValue::NotSet => (),
            },
            ActiveValue::NotSet => match rhs {
                ActiveValue::Changed(rnv, _) => self = ActiveValue::Changed(V::default() - *rnv, Box::new(self.clone())),
                ActiveValue::Unchanged(rv) => self = ActiveValue::Changed(V::default() - *rv, Box::new(self.clone())),
                ActiveValue::NotSet => (),
            },
        };
        self
    }
}
impl<V> SubAssign<&ActiveValue<V>> for ActiveValue<V>
where
    V: Into<Value> + Copy + PartialEq + Sub<V, Output = V> + Default,
{
    fn sub_assign(&mut self, rhs: &Self) {
        match self {
            ActiveValue::Changed(nv, ov) => match rhs {
                ActiveValue::Changed(rnv, _) => *self = ActiveValue::Changed(*nv - *rnv, ov.clone()),
                ActiveValue::Unchanged(rv) => *self = ActiveValue::Changed(*nv - *rv, ov.clone()),
                ActiveValue::NotSet => (),
            },
            ActiveValue::Unchanged(v) => match rhs {
                ActiveValue::Changed(rnv, _) => *self = ActiveValue::Changed(*v - *rnv, Box::new(self.clone())),
                ActiveValue::Unchanged(rv) => *self = ActiveValue::Changed(*v - *rv, Box::new(self.clone())),
                ActiveValue::NotSet => (),
            },
            ActiveValue::NotSet => match rhs {
                ActiveValue::Changed(rnv, _) => *self = ActiveValue::Changed(V::default() - *rnv, Box::new(self.clone())),
                ActiveValue::Unchanged(rv) => *self = ActiveValue::Changed(V::default() - *rv, Box::new(self.clone())),
                ActiveValue::NotSet => (),
            },
        };
    }
}
///
/// # Examples
///
/// ```
///  use arel::prelude::*;
/// use arel::{ActiveValue};
/// let a: ActiveValue<i32> = arel::Set(0);
/// let b = a - 1;
/// assert_eq!(b, ActiveValue::Changed(-1, Box::new(ActiveValue::NotSet)))
/// ```
impl<V> Sub<V> for ActiveValue<V>
where
    V: Into<Value> + Copy + PartialEq + Sub<V, Output = V> + Default,
{
    type Output = Self;
    fn sub(mut self, rhs: V) -> Self::Output {
        match &mut self {
            ActiveValue::Changed(nv, ov) => self = ActiveValue::Changed(*nv - rhs, ov.clone()),
            ActiveValue::Unchanged(v) => self = ActiveValue::Changed(*v - rhs, Box::new(self.clone())),
            ActiveValue::NotSet => self = ActiveValue::Changed(V::default() - rhs, Box::new(ActiveValue::NotSet)),
        };
        self
    }
}

impl<V> SubAssign<V> for ActiveValue<V>
where
    V: Into<Value> + Copy + PartialEq + Sub<V, Output = V> + Default,
{
    fn sub_assign(&mut self, rhs: V) {
        match self {
            ActiveValue::Changed(nv, ov) => *self = ActiveValue::Changed(*nv - rhs, ov.clone()),
            ActiveValue::Unchanged(v) => *self = ActiveValue::Changed(*v - rhs, Box::new(self.clone())),
            ActiveValue::NotSet => *self = ActiveValue::Changed(V::default() - rhs, Box::new(ActiveValue::NotSet)),
        };
    }
}