Merge pull request #7205 from GULPF/json-to-fix

Fix `json.to` for types with generic parameters

lib/pure/json.nim

@@ -1896,7 +1896,7 @@ macro to*(node: JsonNode, T: typedesc): untyped =
   ##     doAssert data.person.age == 21
   ##     doAssert data.list == @[1, 2, 3, 4]
 
-  let typeNode = getType(T)
+  let typeNode = getTypeInst(T)
   expectKind(typeNode, nnkBracketExpr)
   doAssert(($typeNode[0]).normalize == "typedesc")
 

tests/stdlib/tjsonmacro.nim

@@ -380,4 +380,11 @@ when isMainModule:
     let dataDeser = to(dataParsed, Test1)
     doAssert dataDeser.a == 1
     doAssert dataDeser.f == 6
-    doAssert dataDeser.i == 9.9'f32
+    doAssert dataDeser.i == 9.9'f32
+  
+  # deserialize directly into a table
+  block:
+    let s = """{"a": 1, "b": 2}"""
+    let t = parseJson(s).to(Table[string, int])
+    doAssert t["a"] == 1
+    doAssert t["b"] == 2