Do something when specific contract address transfers to another address

Moralis General
#1

I want to make it so that I run something when there a new transaction appears in a specific contract address. What would I need to use in this case?

#2

you can sync all the transfers for a specific address in your Moralis Server db and you an user a hook like beforeSave to run specific code when a new transaction is added there

#3

I tried that and I used the code from the doc and changed it a bit which was


Moralis.Cloud.beforeSave("Transfers", (request) => {
  const from = request.object.get("from");

const to = request.object.get("to");

    request.object.set("fromusername", //data from User table);
  
});

I want to get data from another class such as User.

In the User class, I have a column for username and their wallet address.

Sorry if my explanation might’ve been confusing

#4

what is the problem that you have with that code?

#5

I want to set the usernamefrom value to the username from the User class

#6

ok, you can do that, how do you identify that User?

#7

Using the “from address” from the transfer class

There is a username column in the User class

#8

ok, you can do a query in user class, you will have to use master key

#9

Would I put the query in the cloud function?

Also, would I limit the query to 1 to get the latest one?

#10

you can use .first, probably you will get only a result or no result, you will have to put that query in a cloud function so what you can use master key

#11

What would I need to do if I want to get the attribute of an NFT from the PolygonNFTOwners class using the from address from Transfers class?

#12

you can read more about how to write queries here: https://docs.moralis.io/moralis-server/database/queries

#13

I have my NFT metadata stored inside the token_uri so I have to use fetch to get the attribute of the NFT. However it says that the cloud function cannot require fetch because it is not a whitelisted module.

#14

you can use this in a cloud function: https://docs.moralis.io/moralis-server/cloud-code/httprequest