init domain

crates/domain/src/models/collections.rs

@@ -0,0 +1,43 @@
+use crate::errors::DomainError;
+
+#[derive(Clone, Debug)]
+pub struct Paginated<T> {
+    pub items: Vec<T>,
+    pub total_count: u64,
+    pub limit: u32,
+    pub offset: u32,
+}
+
+#[derive(Clone, Debug)]
+pub struct PageParams {
+    pub limit: u32,
+    pub offset: u32,
+}
+
+impl PageParams {
+    const MAX_LIMIT: u32 = 100;
+    const DEFAULT_LIMIT: u32 = 20;
+
+    pub fn new(limit: Option<u32>, offset: Option<u32>) -> Result<Self, DomainError> {
+        let l = limit.unwrap_or(Self::DEFAULT_LIMIT);
+        if l == 0 || l > Self::MAX_LIMIT {
+            return Err(DomainError::ValidationError(format!(
+                "Limit must be between 1 and {}",
+                Self::MAX_LIMIT
+            )));
+        }
+        Ok(Self {
+            limit: l,
+            offset: offset.unwrap_or(0),
+        })
+    }
+}
+
+impl Default for PageParams {
+    fn default() -> Self {
+        Self {
+            limit: Self::DEFAULT_LIMIT,
+            offset: 0,
+        }
+    }
+}