nautilus_core/column/
marker.rs

1//! `ColumnMarker` — lightweight owned column identifier.
2
3/// A lightweight column identifier for use in selection descriptors.
4///
5/// Stores owned `String` fields so callers can construct markers from
6/// dynamic (runtime) data without resorting to `Box::leak`.
7#[derive(Debug, Clone, PartialEq, Eq)]
8pub struct ColumnMarker {
9    /// Table name.
10    pub table: String,
11    /// Column name.
12    pub name: String,
13}
14
15impl ColumnMarker {
16    /// Create a new column marker.
17    ///
18    /// Accepts any type that implements `Into<String>`, so both
19    /// `&str` literals and owned `String` values work without ceremony.
20    pub fn new(table: impl Into<String>, name: impl Into<String>) -> Self {
21        Self {
22            table: table.into(),
23            name: name.into(),
24        }
25    }
26
27    /// Returns the join-safe alias for this column.
28    ///
29    /// The alias uses the format "table__column" which is safe to use
30    /// in queries with joins, preventing column name conflicts.
31    ///
32    /// # Example
33    ///
34    /// ```
35    /// use nautilus_core::ColumnMarker;
36    ///
37    /// let marker = ColumnMarker::new("users", "id");
38    /// assert_eq!(marker.alias(), "users__id");
39    /// ```
40    pub fn alias(&self) -> String {
41        format!("{}__{}", self.table, self.name)
42    }
43}
nautilus_core/column/marker.rs

nautilus_core/column/
marker.rs
