我将尝试使用pyMongo执行内联mapreduce操作。
代码如下:
```python ```
```python ```
代码如下:
```python ```
```python ```
import pymongo
from bson.code import Code
con = pymongo.MongoClient()
map_func = Code("""
function() {
var all = this.members.concat(this.admins)
var group_id = this._id
all.forEach(function(_id) {
emit(_id, [group_id])
})
}
""")
reduce_func = Code("""
function(key, values) {
var ob = {};
ob[key] = [];
for (var i=0; i<values.length; i++) {
ob[key].push(values[i][0])
}
return ob
}
""")
finalize_func = Code("""
function(key, value) {
if (typeof(value.push) == "function") {
return value
} else {
return value[key]
}
}
""")
result = con.test.group.inline_map_reduce(
map_func,
reduce_func,
finalize=finalize_func)
import pprint; pprint.pprint(result)
此操作的输出结果为:
[{u'_id': u'135348133252952338363702',
u'value': [u'135457069105859781018098',
u'135661481520484615218098',
u'135391961249458761918098',
u'135758863859275369318098',
u'135156779012512657918098',
u'135285081801846289218098',
u'136040996346306049718098',
u'136237587535011048218098',
u'136862399436556328318098']},
{u'_id': u'136068596781820946163702',
u'value': [u'136068597966313224518098',
u'135156779012512657918098',
u'136415311739865096818098']}]
是否有任何挂钩/操作符,使我可以将输出字段重命名为任何自定义字符串,例如“group_id”而不是“values”?
我阅读了Mongo的MapReduce文档,但没有找到如何完成此操作的提示。