mongodb 删除數組中集合的某個字段

• 原始資料

[
	{"id":123,"c_array":[{"taskId":0,"name":"n1"},{"taskId":1,"name":"n2"}]},
	{"id":124,"c_array":[{"taskId":2,"name":"n3"},{"taskId":3,"name":"n4"}]}
]
           

• 執行結果

[
	{"id":123,"c_array":[{"name":"n1"},{"name":"n2"}]},
	{"id":124,"c_array":[{"name":"n3"},{"name":"n4"}]}
]