resolve name_arg when following references

resolve the varaible name when creating path prefixes for references.
without this the errors end up as `data.{data_key} must be string`
instead of `data.a must be string`

Author: davidszotten

fastjsonschema/generator.py

@@ -201,6 +201,8 @@ def generate_ref(self):
             assert self._variable_name.startswith("data")
             path = self._variable_name[4:]
             name_arg = '(name_prefix or "data") + "{}"'.format(path)
+            if '{' in name_arg:
+                name_arg = name_arg + '.format(**locals())'
             self.l('{}({variable}, custom_formats, {name_arg})', name, name_arg=name_arg)
 
 

tests/examples/path_with_definition/invalid.error

@@ -0,0 +1 @@
+data.a must be string

tests/examples/path_with_definition/invalid.json

@@ -0,0 +1,3 @@
+{
+    "a": 1
+}

tests/examples/path_with_definition/test.schema.json

@@ -0,0 +1,11 @@
+{
+    "type": "object",
+    "additionalProperties": {
+        "$ref": "#/definitions/a-ref"
+    },
+    "definitions": {
+        "a-ref": {
+            "type": "string"
+        }
+    }
+}