diff --git a/core/package.json b/core/package.json
index 3c22298..1a6ceec 100644
--- a/core/package.json
+++ b/core/package.json
@@ -1,40 +1,40 @@
 {
-  "name": "@andes/core",
-  "version": "1.10.0",
-  "description": "",
-  "main": "build/index.js",
-  "module": "build/index.js",
-  "typings": "build/index.d.ts",
-  "scripts": {
-    "prepare": "tsc -p tsconfig.build.json",
-    "start": "tsc -p tsconfig.build.json -w",
-    "lint": "tslint --project tsconfig.build.json",
-    "test": "jest"
-  },
-  "keywords": [],
-  "author": "",
-  "license": "MIT",
-  "dependencies": {
-    "@andes/api-tool": "^2.1.0",
-    "express": "^4.17.1",
-    "memory-cache": "^0.2.0",
-    "moment": "^2.24.0",
-    "mongoose": "^5.6.11",
-    "node-cache-redis": "^2.14.0"
-  },
-  "devDependencies": {
-    "@types/express": "^4.17.1",
-    "@types/jest": "^22.1.1",
-    "@types/node": "^10.0.0",
-    "@types/supertest": "^2.0.8",
-    "body-parser": "^1.19.0",
-    "jest": "^22.1.4",
-    "mongodb-memory-server-global": "^5.2.5",
-    "supertest": "^4.0.2",
-    "ts-jest": "^22.4.6",
-    "tslint": "^5.9.1",
-    "tslint-eslint-rules": "^5.4.0",
-    "tslint-react": "^3.4.0",
-    "typescript": "^3.0.0"
-  }
+    "name": "@andes/core",
+    "version": "1.10.1",
+    "description": "",
+    "main": "build/index.js",
+    "module": "build/index.js",
+    "typings": "build/index.d.ts",
+    "scripts": {
+        "prepare": "tsc -p tsconfig.build.json",
+        "start": "tsc -p tsconfig.build.json -w",
+        "lint": "tslint --project tsconfig.build.json",
+        "test": "jest"
+    },
+    "keywords": [],
+    "author": "",
+    "license": "MIT",
+    "dependencies": {
+        "@andes/api-tool": "^2.1.0",
+        "express": "^4.17.1",
+        "memory-cache": "^0.2.0",
+        "moment": "^2.24.0",
+        "mongoose": "^5.6.11",
+        "node-cache-redis": "^2.14.0"
+    },
+    "devDependencies": {
+        "@types/express": "^4.17.1",
+        "@types/jest": "^22.1.1",
+        "@types/node": "^10.0.0",
+        "@types/supertest": "^2.0.8",
+        "body-parser": "^1.19.0",
+        "jest": "^22.1.4",
+        "mongodb-memory-server-global": "^5.2.5",
+        "supertest": "^4.0.2",
+        "ts-jest": "^22.4.6",
+        "tslint": "^5.9.1",
+        "tslint-eslint-rules": "^5.4.0",
+        "tslint-react": "^3.4.0",
+        "typescript": "^3.0.0"
+    }
 }
\ No newline at end of file
diff --git a/core/src/query-builder/in-mongo.ts b/core/src/query-builder/in-mongo.ts
index 36de0c7..94dc816 100644
--- a/core/src/query-builder/in-mongo.ts
+++ b/core/src/query-builder/in-mongo.ts
@@ -100,6 +100,19 @@ equalOrNull.withField = (field: string) => {
     return { field, fn: equalOrNull };
 };
 
+
+export function containsField(value: boolean) {
+    let query = { $exists: value };
+    if (value) {
+        query['$ne'] = null;
+    };
+    return query;
+}
+
+containsField.withField = (field: string) => {
+    return { field, fn: containsField };
+};
+
 /**
  * Devuelve una query con elemMatch por keyName y valueName
  *
@@ -207,5 +220,6 @@ export const MongoQuery = {
     queryArray,
     buildQuery,
     inArray,
-    equalOrNull
+    equalOrNull,
+    containsField
 };