如何在没有唯一键的情况下在 firebase 中添加新数据

Question

I'm using it in react native app to save the purchase history in firebase with only 0,1,2,3,4.... keys not the system generated unique key

I'm using this below syntax

firebase2.database().ref('user_data/' + my_key+"/purchase_history").push(MY_DATA)

I want to remove the key between purchase_history and 0 and when I add the new data then it should be visible like 0 then 1 then 2 then 3 and so on......

Answer 1

If I correctly understand your question, you should use the set() method instead of the push() one, as follows:

const newKey = "0";  // Or "1", "2", "3".... 
firebase2.database().ref("user_data/" + my_key + "/purchase_history/" + newKey).set(MY_DATA);

As a matter of fact, push() generates a new child location using a unique key which is automatically generated by the Realtime Database (ie -MR99pAG.... ).