如何使用流星显示twitter和instagram @（用户名）作为配置文件名称？

Question

I'm trying to make a variable to choose from 2 differents values, if one is null then select the other.

author: '@'+ user.services.instagram.username.toUpperCase() || user.services.twitter.screenName.toUpperCase()

This results in an error when I try to comment on a Twitter account.

TypeError: Cannot read property 'instagram' of undefined

Here a snap code

comment = _.extend(commentAttributes, {
  userId: user._id,
  // author: '@'+user.services.instagram.username.toUpperCase(),
  author: '@'+ user.services.instagram.username.toUpperCase() || user.services.twitter.screenName.toUpperCase(),
  submitted: formatDate(new Date())
});

Answer 1

1. Your error message simply says that your user.services variable is undefined .
2. '@' + null gives '@null' , so it is always truthy.

Answer 2

I found the solution. I was trying to pull @ handles of instagram and twitter with the 'same' variable, so I can use it as a profile name. The problem was Instagram is using services.instagram.username and Twitter is using services.twitter.screenName

I could fix this editing the meteor packages but that is not a complete solution, instead I made a condition for 'Account.onCreateUser' based on this .

So I just made that profile.name is saving user @ instead of name.

        if (service == 'instagram') {
            if (!user.profile)
                user.profile = {};
            if (!user.profile.name)
                user.profile.name = user.services[service].username;
        }

        if (service == 'twitter') {
          if (!user.profile)
                user.profile = {};
          if (!user.profile.name)
                user.profile.name = user.services[service].screenName;
        }