Add filtering

src/pagination.ts

@@ -35,3 +35,25 @@ export function getSortObject(
 
   return sortObj;
 }
+
+export function getFilterObject(
+  params: PageQueryParams,
+  validFields: Array<string>
+) {
+  const filterObj: Array<{}> = [];
+
+  if (params.filter && params.filter != "") {
+    const filterOptions = params.filter.split(",");
+    filterOptions.forEach((item) => {
+      if (item.includes("!=")) {
+        const [key, val] = item.split("!=").map((token) => token.trim());
+        if (validFields.includes(key)) filterObj.push({ [key]: { $ne: val } });
+      } else if (item.includes("=")) {
+        const [key, val] = item.split("=").map((token) => token.trim());
+        if (validFields.includes(key)) filterObj.push({ [key]: { $eq: val } });
+      }
+    });
+  }
+
+  return filterObj;
+}