fix: don't remove the schema's original id (#44)

Author: spacewander

lib/jsonschema.lua

@@ -1149,8 +1149,12 @@ return {
       parse_ipv6 = custom and custom.parse_ipv6 or parse_ipv6
     }
     local name = custom and custom.name
+    local has_original_id
+    if type(schema) == "table" and schema.id then
+      has_original_id = true
+    end
     local ctx = generate_main_validator_ctx(schema, custom):as_func(name, validatorlib, customlib)
-    if type(schema) == "table" then
+    if type(schema) == "table" and not has_original_id then
       schema.id = nil
     end
     return ctx

t/default.lua

@@ -121,3 +121,15 @@ if ngx.now() - start_time > 0.1 then
   ngx.exit(-1)
 end
 ngx.say("passed: check uniqueItems array with few table items")
+
+----------------------------------------------------- test case 5
+local rule = {
+    id = "root:/",
+    type = "object",
+    properties = {
+        base = {type = "string", default = "xxxxxxxx"}
+    }
+}
+
+local validator = jsonschema.generate_validator(rule)
+assert(rule.id == "root:/", "fail: schema id is removed")