Add default config when init

update JsonEncoder

fastapi_cache/__init__.py

@@ -1,17 +1,34 @@
+from typing import Callable
+
+from fastapi_cache.coder import Coder, JsonCoder
+from fastapi_cache.key_builder import default_key_builder
+
+
 class FastAPICache:
     _backend = None
     _prefix = None
     _expire = None
     _init = False
+    _coder = None
+    _key_builder = None
 
     @classmethod
-    def init(cls, backend, prefix: str = "", expire: int = None):
+    def init(
+        cls,
+        backend,
+        prefix: str = "",
+        expire: int = None,
+        coder: Coder = JsonCoder,
+        key_builder: Callable = default_key_builder,
+    ):
         if cls._init:
             return
         cls._init = True
         cls._backend = backend
         cls._prefix = prefix
         cls._expire = expire
+        cls._coder = coder
+        cls._key_builder = key_builder
 
     @classmethod
     def get_backend(cls):
@@ -25,3 +42,11 @@ class FastAPICache:
     @classmethod
     def get_expire(cls):
         return cls._expire
+
+    @classmethod
+    def get_coder(cls):
+        return cls._coder
+
+    @classmethod
+    def get_key_builder(cls):
+        return cls._key_builder