diff --git a/package.json b/package.json
index 5899369..b77467c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "safe-typeorm",
-  "version": "1.0.11",
+  "version": "1.0.12",
   "description": "Safe Relationship Decorators for the TypeORM",
   "main": "lib/index.js",
   "typings": "lib/index.d.ts",
diff --git a/src/Model.ts b/src/Model.ts
index f07ab5c..e7cf3ea 100644
--- a/src/Model.ts
+++ b/src/Model.ts
@@ -22,6 +22,7 @@ import { initialize } from "./functional/initialize";
 import { insert } from "./functional/insert";
 import { toPrimitive } from "./functional/toPrimitive";
 import { update } from "./functional/update";
+import { WhereColumnType } from "./typings/WhereColumnType";
 
 /**
  * The basic model class.
@@ -233,7 +234,7 @@ export abstract class Model extends orm.BaseEntity
             Literal extends SpecialFields<T, Field>>
         (
             this: Model.Creator<T>,
-            fieldLike: `${Literal}` | `${string}.${Literal}`,
+            fieldLike: WhereColumnType<`${Literal}` | `${string}.${Literal}`>,
             param: Field.MemberType<T, Literal> | null
         ): [string, Record<string, Field.ValueType<T[Literal]>>];
 
@@ -267,7 +268,7 @@ export abstract class Model extends orm.BaseEntity
             OperatorType extends Operator>
         (
             this: Model.Creator<T>,
-            fieldLike: `${Literal}` | `${string}.${Literal}`,
+            fieldLike: WhereColumnType<`${Literal}` | `${string}.${Literal}`>,
             operator: OperatorType,
             param: OperatorType extends "="|"!="|"<>" 
                 ? Field.MemberType<T, Literal> | null
@@ -301,7 +302,7 @@ export abstract class Model extends orm.BaseEntity
             Literal extends SpecialFields<T, Field>>
         (
             this: Model.Creator<T>,
-            fieldLike: `${Literal}` | `${string}.${Literal}`,
+            fieldLike: WhereColumnType<`${Literal}` | `${string}.${Literal}`>,
             operator: "IN" | "NOT IN",
             parameters: Array<Field.MemberType<T, Literal>>,
         ): [string, Record<string, Array<Field.ValueType<T[Literal]>>>];
@@ -336,7 +337,7 @@ export abstract class Model extends orm.BaseEntity
             Literal extends SpecialFields<T, Field>>
         (
             this: Model.Creator<T>,
-            fieldLike: `${Literal}` | `${string}.${Literal}`,
+            fieldLike: WhereColumnType<`${Literal}` | `${string}.${Literal}`>,
             operator: "BETWEEN",
             minimum: Field.MemberType<T, Literal>,
             maximum: Field.MemberType<T, Literal>
@@ -347,7 +348,7 @@ export abstract class Model extends orm.BaseEntity
             Literal extends SpecialFields<T, Field>>
         (
             this: Model.Creator<T>,
-            fieldLike: `${Literal}` | `${string}.${Literal}`,
+            fieldLike: WhereColumnType<`${Literal}` | `${string}.${Literal}`>,
             ...rest: any[]
         ): [string, any]
     {
diff --git a/src/functional/getWhereArguments.ts b/src/functional/getWhereArguments.ts
index 815ebff..cd013eb 100644
--- a/src/functional/getWhereArguments.ts
+++ b/src/functional/getWhereArguments.ts
@@ -9,6 +9,7 @@ import { SpecialFields } from "../typings/SpecialFields";
 import { BelongsAccessorBase } from "../decorators/base/BelongsAccessorBase";
 import { findRepository } from "./findRepository";
 import { get_column_name_tuple } from "./internal/get_column_name_tuple";
+import { WhereColumnType } from "../typings/WhereColumnType";
 
 /**
  * Get arguments for the where-equal query.
@@ -39,7 +40,7 @@ export function getWhereArguments<
         Literal extends SpecialFields<T, Field>>
     (
         creator: Creator<T>,
-        fieldLike: `${Literal}` | `${string}.${Literal}`,
+        fieldLike: WhereColumnType<`${Literal}` | `${string}.${Literal}`>,
         param: Field.MemberType<T, Literal> | null
     ): [string, Record<string, Field.ValueType<T[Literal]>>];
 
@@ -69,12 +70,12 @@ export function getWhereArguments<
  *         never can be the runtime error
  */
 export function getWhereArguments<
-    T extends { [P in Literal]: Field; }, 
-    Literal extends SpecialFields<T, Field>,
+        T extends { [P in Literal]: Field; }, 
+        Literal extends SpecialFields<T, Field>,
         OperatorType extends Operator>
     (
         creator: Creator<T>,
-        fieldLike: `${Literal}` | `${string}.${Literal}`,
+        fieldLike: WhereColumnType<`${Literal}` | `${string}.${Literal}`>,
         operator: OperatorType,
         param: OperatorType extends "="|"!="|"<>"
             ? Field.MemberType<T, Literal> | null
@@ -111,7 +112,7 @@ export function getWhereArguments<
         Literal extends SpecialFields<T, Field>>
     (
         creator: Creator<T>,
-        fieldLike: `${Literal}` | `${string}.${Literal}`,
+        fieldLike: WhereColumnType<`${Literal}` | `${string}.${Literal}`>,
         operator: "IN" | "NOT IN",
         parameters: Array<Field.MemberType<T, Literal>>
     ): [string, Record<string, [Field.ValueType<T[Literal]>, Field.ValueType<T[Literal]>]>];
@@ -147,7 +148,7 @@ export function getWhereArguments<
         Literal extends SpecialFields<T, Field>>
     (
         creator: Creator<T>,
-        fieldLike: `${Literal}` | `${string}.${Literal}`,
+        fieldLike: WhereColumnType<`${Literal}` | `${string}.${Literal}`>,
         operator: "BETWEEN",
         minimum: Field.MemberType<T, Literal>,
         maximum: Field.MemberType<T, Literal>
@@ -158,14 +159,23 @@ export function getWhereArguments<
         Literal extends SpecialFields<T, Field>>
     (
         creator: Creator<T>,
-        fieldLike: `${Literal}` | `${string}.${Literal}`,
+        fieldLike: WhereColumnType<`${Literal}` | `${string}.${Literal}`>,
         ...rest: any[]
     ): [string, any]
 {
-    const tuple: [string, string] = get_column_name_tuple(creator, fieldLike);
+    const tuple: [string, string] = get_column_name_tuple
+    (
+        creator, 
+        typeof fieldLike === "string" 
+            ? fieldLike 
+            : fieldLike[0]
+    );
     const column: string = tuple[0]
         ? `${tuple[0]}.${tuple[1]}`
         : tuple[1];
+    const left: string = typeof fieldLike === "string" 
+        ? column 
+        : fieldLike[1](column);
 
     // MOST OPERATORS
     if (rest.length <= 2)
@@ -190,9 +200,9 @@ export function getWhereArguments<
         if (param === null)
         {
             if (operator === "=")
-                return [`${column} IS NULL`] as any;
+                return [`${left} IS NULL`] as any;
             else if (operator === "!=" || operator === "<>")
-                return [`${column} IS NOT NULL`] as any;
+                return [`${left} IS NOT NULL`] as any;
             else
                 throw new InvalidArgument(`Error on ${creator.name}.getColumn(): unable to bind null value for the ${operator} operator.`);
         }
@@ -202,7 +212,7 @@ export function getWhereArguments<
         const binding: string = (operator === "IN" || operator === "NOT IN")
             ? `(:...${uuid})`
             : `:${uuid}`;
-        return [`${column} ${operator} ${binding}`, { [uuid]: param }];
+        return [`${left} ${operator} ${binding}`, { [uuid]: param }];
     }
 
     // BETWEEN OPERATOR
@@ -211,7 +221,7 @@ export function getWhereArguments<
     const minimum: Field.ValueType<T[Literal]> = _Decompose_entity(rest[1]);
     const maximum: Field.ValueType<T[Literal]> = _Decompose_entity(rest[2]);
 
-    return [`${column} BETWEEN :${from} AND :${to}`, 
+    return [`${left} BETWEEN :${from} AND :${to}`, 
     {
         [from]: minimum,
         [to]: maximum
diff --git a/src/typings/Field.ts b/src/typings/Field.ts
index 20341e7..93e8ca3 100644
--- a/src/typings/Field.ts
+++ b/src/typings/Field.ts
@@ -9,18 +9,20 @@ export type Field
     | boolean
     | Date
     | Belongs.ManyToOne<any, PrimaryColumnType>
+    | Belongs.External.ManyToOne<any, PrimaryColumnType>
     | Belongs.OneToOne<any, PrimaryColumnType>
+    | Belongs.External.OneToOne<any, PrimaryColumnType>
     | null;
 
 export namespace Field
 {
     export type ValueType<Type extends Field> 
         = Type extends string ? Type
-        : Type extends Belongs.ManyToOne<infer Target, infer KeyType, infer Options> 
+        : Type extends (Belongs.ManyToOne<infer Target, infer KeyType, infer Options> | Belongs.External.ManyToOne<infer Target, infer KeyType, infer Options>)
             ? Options extends { nullable: true }
                 ? (ModelLike<Target, KeyType, true> | PrimaryColumnType.ValueType<KeyType> | null)
                 : (ModelLike<Target, KeyType, false> | PrimaryColumnType.ValueType<KeyType>)
-        : Type extends Belongs.OneToOne<infer Target, infer KeyType, infer Options>
+        : Type extends (Belongs.OneToOne<infer Target, infer KeyType, infer Options> | Belongs.External.OneToOne<infer Target, infer KeyType, infer Options>)
             ? Options extends { nullable: true }
                 ? (ModelLike<Target, KeyType, true> | PrimaryColumnType.ValueType<KeyType> | null)
                 : (ModelLike<Target, KeyType, false> | PrimaryColumnType.ValueType<KeyType>)
diff --git a/src/typings/WhereColumnType.ts b/src/typings/WhereColumnType.ts
new file mode 100644
index 0000000..b8be0da
--- /dev/null
+++ b/src/typings/WhereColumnType.ts
@@ -0,0 +1,3 @@
+export type WhereColumnType<Literal extends string> 
+    = Literal 
+    | [Literal, (str: string) => string];
\ No newline at end of file
diff --git a/src/typings/index.ts b/src/typings/index.ts
index 84a2424..5827cb5 100644
--- a/src/typings/index.ts
+++ b/src/typings/index.ts
@@ -10,4 +10,5 @@ export * from "./Primitive";
 export * from "./Relationship";
 export * from "./Same";
 export * from "./SpecialFields";
-export * from "./StringColumnType";
\ No newline at end of file
+export * from "./StringColumnType";
+export * from "./WhereColumnType";
\ No newline at end of file