From e79fa9875d2122e607fb1150dafa99d703ed11b8 Mon Sep 17 00:00:00 2001
From: Joe Carstairs <me@joeac.net>
Date: Mon, 25 Nov 2024 13:05:35 +0000
Subject: Transform categories

---
 rust/schist_models/src/date_utc.rs | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

(limited to 'rust/schist_models/src')

diff --git a/rust/schist_models/src/date_utc.rs b/rust/schist_models/src/date_utc.rs
index c801585..d3a1d2e 100644
--- a/rust/schist_models/src/date_utc.rs
+++ b/rust/schist_models/src/date_utc.rs
@@ -69,6 +69,15 @@ impl DateUtc {
         Ok(Self { chrono_datetime_utc })
     }
 
+    pub fn sub_days(&self, days: u64) -> Result<Self> {
+        let chrono_datetime_utc = self
+            .chrono_datetime_utc
+            .checked_sub_days(chrono::Days::new(days))
+            .with_context(|| format!("failed to subtract {} days from {}", days, self))
+            .unwrap();
+        Ok(Self { chrono_datetime_utc })
+    }
+
     fn is_day_str(str: &str) -> bool {
         if str.len() != 10 {
             return false;
@@ -151,9 +160,14 @@ impl Dateable for DateUtc {
 
 impl From<DatetimeUtc> for DateUtc {
     fn from(datetime_utc: DatetimeUtc) -> Self {
+        Self::from(&datetime_utc)
+    }
+}
+
+impl From<&DatetimeUtc> for DateUtc {
+    fn from(datetime_utc: &DatetimeUtc) -> Self {
         Self {
             chrono_datetime_utc: datetime_utc
-                .borrow()
                 .to_string()
                 .parse::<DateTime<Utc>>().unwrap()
                 .with_time(NaiveTime::from_hms_opt(0, 0, 0).unwrap()).unwrap(),
-- 
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