Fix errors

Author: esrakartalOpt

lib/optimizely/cmab/cmab_client.rb

@@ -62,7 +62,7 @@ def fetch_decision(rule_id, user_id, attributes, cmab_uuid, timeout: MAX_WAIT_TI
       # Returns:
       #   The variation ID.
       url = "https://prediction.cmab.optimizely.com/predict/#{rule_id}"
-      cmab_attributes = attributes.map { |key, value| {id: key, value: value, type: 'custom_attribute'} }
+      cmab_attributes = attributes.map { |key, value| {id: key.to_s, value: value, type: 'custom_attribute'} }
 
       request_body = {
         instances: [{

spec/cmab_client_spec.rb

@@ -34,8 +34,8 @@
         visitorId: user_id,
         experimentId: rule_id,
         attributes: [
-          {id: 'attr1', value: 'value1', type: 'custom_attribute'},
-          {id: 'attr2', value: 'value2', type: 'custom_attribute'}
+          {'id' => 'attr1', 'value' => 'value1', 'type' => 'custom_attribute'},
+          {'id' => 'attr2', 'value' => 'value2', 'type' => 'custom_attribute'}
         ],
         cmabUUID: cmab_uuid
       }]