Add 'distinct' clause

src/db/util/raw-model.ts

@@ -46,6 +46,7 @@ export type FindFn<F extends FieldDefinition, AdditionalArgs = {}> = (
     skipValidation?: boolean;
     trx?: Knex.Transaction<any, any>;
     orderByNullsLast?: boolean;
+    distinct?: Array<keyof InstanceDataOf<F>>;
   } & AdditionalArgs
 ) => Promise<Array<InstanceDataOf<F>>>;
 
@@ -162,6 +163,7 @@ export const defineRawModel =
       skipValidation = false,
       trx,
       orderByNullsLast,
+      distinct,
     } = {}) => {
       const builder = trx ? masterTable().transacting(trx) : replicaTable();
       const query = builder.where(prepareCondition(where ?? {})).select('*');
@@ -188,6 +190,20 @@ export const defineRawModel =
         }
       }
 
+      if (distinct !== undefined) {
+        if (orderBy !== undefined) {
+          // We need to add both the columns in the order by clause and the distinct clause
+          // Merge the list of columns and keep only unique values
+          const distinctColumns = [
+            ...new Set([...distinct, ...orderBy.map((order) => order.column)]),
+          ];
+          query.distinctOn(distinctColumns);
+        } else {
+          // If there is no order by clause, we can directly use the distinct clause
+          query.distinctOn(distinct);
+        }
+      }
+
       const res = await query;
 
       if (skipValidation) {