Ability to set the key calculation function

README.md

@@ -99,7 +99,12 @@ by setting this to `CacheReturnType.Promise`.
     cacheUntilRejected?: boolean
 
 When caching a method returning a Promise, this option will clear the relevant cache when the Promise is
-rejected. If the Promise resolves normally, the cache persists.
+rejected. If the Promise resolves normally, the cache persists. 
+
+    calculateCacheKeyFunction?: (target: any, args: any) => string;
+
+If necessary, it is possible to set your own function for creating a key for caching
+
 
 ### `MethodCacheService`
 

src/core/decorator/base-cache.decorator.spec.ts

@@ -8,6 +8,17 @@ class TestCache {
 
   public getterCalled: number = 0;
 
+  public b: number = 0;
+
+  @baseCacheDecorator(CacheType.Memory, {
+    calculateCacheKeyFunction: (target: TestCache, args) => {
+      return JSON.stringify({ uniqCacheKey: target.b, ...args });
+    }
+  })
+  public sum(a): number {
+    return a + this.b;
+  }
+
   @baseCacheDecorator(CacheType.Memory)
   get testGetter(): string {
     this.getterCalled++;
@@ -86,4 +97,12 @@ describe('Cache decorator is properly set', () => {
     expect(noCache3).toEqual(cache3);
     expect(noCache3).toEqual(value1 + increment - value2);
   });
+  it('if a key calculation method is passed, it is used for calculations', () => {
+    const testCache2 = new TestCache();
+    testCache.b = 1;
+    testCache2.b = 10;
+
+    expect(testCache.sum(1)).toEqual(2);
+    expect(testCache2.sum(1)).toEqual(11);
+  });
 });

src/core/interface/base-cache-options.ts

@@ -1,8 +1,9 @@
-import { CacheReturnType } from '../enum/cache-return-type.enum';
+import {CacheReturnType} from '../enum/cache-return-type.enum';
 
 export interface BaseCacheOptions {
-  key?: string;
-  returnType?: CacheReturnType;
-  ttl?: string | number | Date;
-  cacheUntilRejected?: boolean;
+    key?: string;
+    returnType?: CacheReturnType;
+    ttl?: string | number | Date;
+    cacheUntilRejected?: boolean;
+    calculateCacheKeyFunction?: (target: any, args: any) => string;
 }

src/core/util/decorator.util.ts

@@ -24,8 +24,9 @@ export function createCacheDecorator(
   let container: CacheContainerOptions | undefined | null = null;
 
   return function(this: (...args) => any, ...args: any[]): any {
-    const argsString: string = JSON.stringify(args);
-
+    const argsString: string = options.calculateCacheKeyFunction
+      ? options.calculateCacheKeyFunction(this, args)
+      : JSON.stringify(args);
     if (container === null) {
       container = getCacheContainer(target.constructor as any);
       if (container) {