json - couchdb 查询带有关键参数的 View

Question

没有关键参数， View 正常工作
$curl "http://127.0.0.1:5984/music/_design/albums/_view/by_release_date"

{"total_rows":311,"offset":0,"rows":[
{"id":"a4327d0718d3b1e227df7124a99a7fc3","key":"1991-12-22","value":{"by":"张楚","title":"黑月亮"}},
{"id":"a4327d0718d3b1e227df7124a99a3ac5","key":"unknown","value":{"by":"郑钧","title":"郑钧:赤裸裸"}},

但是当使用 key 时，我得到了错误的请求响应或空结果。为什么？
$curl "http://127.0.0.1:5984/music/_design/albums/_view/by_release_date?key=unknown"{"error":"bad_request","re​​ason":"invalid_json"}
$curl "http://127.0.0.1:5984/music/_design/albums/_view/by_release_date?key=1993"{"total_rows":311,"offset":0,"rows":[

]}

map 功能是:

map
function(doc) {
  key = doc.release_date
  value = {by: doc.author , title: doc.title}
  emit(key, value);
}

Answer 1

键是一个字符串，因此您需要包含 " = %22 ，例如 http://127.0.0.1:5984/music/_design/albums/_view/by_release_date?key=%221993%22