Merge pull request 'fix-489后端部分' (#573) from fix-558 into V20211101

Reviewed-on: https://git.openi.org.cn/OpenI/aiforge/pulls/573
Reviewed-by: lewis <747342561@qq.com>

models/topic.go

@@ -178,7 +178,7 @@ func (opts *FindTopicOptions) toConds() builder.Cond {
 	}
 
 	if opts.Keyword != "" {
-		cond = cond.And(builder.Like{"topic.name", opts.Keyword})
+		cond = cond.And(builder.Like{"topic.name", strings.ToLower(opts.Keyword)})
 	}
 
 	return cond