link in table definition

web/src/pages/add_table/state.rs

@@ -48,6 +48,8 @@ pub(crate) struct BuilderForm {
     #[serde(default)]
     pub gtin_type_input: String,
     #[serde(default)]
+    pub link_table_input: String,
+    #[serde(default)]
     pub decimal_precision_input: String,
     #[serde(default)]
     pub decimal_scale_input: String,
@@ -96,6 +98,7 @@ impl BuilderForm {
             type_input: self.column_type_input.clone(),
             temporal_type_input: self.temporal_type_input.clone(),
             gtin_type_input: self.gtin_type_input.clone(),
+            link_table_input: self.link_table_input.clone(),
             decimal_precision_input: self.decimal_precision_input.clone(),
             decimal_scale_input: self.decimal_scale_input.clone(),
             indexing_input: self.column_indexing_input.clone(),

web/src/pages/add_table/ui.rs

@@ -169,6 +169,12 @@ mod tests {
         let html = render_builder(&state);
         assert!(html.contains(r#"name="column_rounding_input""#));
         assert!(html.contains(r#"list="currency-codes""#));
+
+        state.draft.columns.type_input = "link".to_string();
+        let html = render_builder(&state);
+        assert!(html.contains("Link alias"));
+        assert!(html.contains(r#"name="link_table_input""#));
+        assert!(html.contains(r#"<option value="customer""#));
     }
 
     #[test]

web/src/pages/admin/table_definition/state.rs

@@ -277,6 +277,14 @@ pub(crate) struct TablePermissionAction {
 }
 
 impl TableDefinitionPageState {
+    pub(crate) fn link_target_tables(&self) -> Vec<&str> {
+        self.tables
+            .iter()
+            .filter(|table| table.name != self.selection.table && table.name != "accounts")
+            .map(|table| table.name.as_str())
+            .collect()
+    }
+
     /// The selected table's summary, which is where its kind and dependencies
     /// come from.
     pub(crate) fn selected_table(&self) -> Option<&TableSummary> {

web/src/pages/admin/table_definition/ui.rs

@@ -229,6 +229,20 @@ mod tests {
         assert!(!html.contains(r#"<option value="accounting""#));
     }
 
+    #[test]
+    fn the_append_panel_offers_link_targets_and_an_alias() {
+        let mut state = page();
+        state.columns.type_input = "link".to_string();
+        state.tables.push(table("customer", "dynamic"));
+
+        let html = render_column_panel(&state);
+
+        assert!(html.contains("Link alias"));
+        assert!(html.contains(r#"name="link_table_input""#));
+        assert!(html.contains(r#"<option value="customer""#));
+        assert!(!html.contains(r#"<option value="invoice""#));
+    }
+
     /// A system table is the backend's own; every write below is refused for
     /// it, so the workspace shows the definition and stops there.
     #[test]