in which parts making posts.user.postcount return postcount?

[JackL]

I checked the database and found that pid reserve the IP address of that post as well, however posts.ip obviously does not return that string value.

So I assume that there are codes in which determining function .user.postcount to return an integer right? Can anyone tell me that where could I find those codes, So that I can write some similar function to return the IP address？

[baris]

We do return the ip but only for admins and mods.

post.ip = topicPrivileges.isAdminOrMod ? post.ip : undefined; take a look here

Keep in mind IP tracking needs to be turned on in the ACP for this to work.