refactor: remove duplicated code in postgres indexes (#1805)

tortoise/contrib/postgres/indexes.py

@@ -1,7 +1,3 @@
-from typing import Optional, Tuple
-
-from pypika.terms import Term, ValueWrapper
-
 from tortoise.indexes import PartialIndex
 
 
@@ -10,22 +6,6 @@ class PostgreSQLIndex(PartialIndex):
         "CREATE INDEX {exists}{index_name} ON {table_name} USING{index_type}({fields}){extra};"
     )
 
-    def __init__(
-        self,
-        *expressions: Term,
-        fields: Optional[Tuple[str, ...]] = None,
-        name: Optional[str] = None,
-        condition: Optional[dict] = None,
-    ) -> None:
-        super().__init__(*expressions, fields=fields, name=name)
-        if condition:
-            cond = " WHERE "
-            items = []
-            for k, v in condition.items():
-                items.append(f"{k} = {ValueWrapper(v)}")
-            cond += " AND ".join(items)
-            self.extra = cond
-
 
 class BloomIndex(PostgreSQLIndex):
     INDEX_TYPE = "BLOOM"

tortoise/indexes.py

@@ -71,8 +71,6 @@ def __init__(
         super().__init__(*expressions, fields=fields, name=name)
         if condition:
             cond = " WHERE "
-            items = []
-            for k, v in condition.items():
-                items.append(f"{k} = {ValueWrapper(v)}")
+            items = [f"{k} = {ValueWrapper(v)}" for k, v in condition.items()]
             cond += " AND ".join(items)
             self.extra = cond