Connect service to existing meteor account

Question 1

So there's been work to solve this problem, but unfortunately the pull request https://github.com/meteor/meteor/pull/1133 never got merged. Probably your best bet is check the meteor-core Google Groups and see if there was any comment on it and if not, see if you can get a core dev to comment on it.

If you want to still use the pull request, what you could do is remove the various Meteor accounts-* packages, then in the root of your project, create a /packages folder and copy yubozhao's patched accounts-* packages in there (probably smart to append -custom). You'd then meteor add accounts-base-custom, etc. to add them to your project.

Note though, yubozhao wrote this is 6-7 months ago and you may need to stick with whatever version of Meteor that was current then for it to work.

Update April 2014: There's an Atmosphere package now that has a similar use case that might be useful: https://atmospherejs.com/package/accounts-merge

Question 2

Here is a code that worked for me ( inside server folder ):

Accounts.onCreateUser(function(options, user) {
    var email, oldUser, service;
    /*
    user.groups = {
        created: "",
        invited:"",
        RSVP:{
            coming:"",
            notComing:"",
            noReplay:""
        }
    };
    */
    if (user.profile == null) {
        user.profile = options.profile
    }
    if (user.services != null) {
        service = _.keys(user.services)[0];
        email = user.services[service].email;
        if (email != null) {
            oldUser = Meteor.users.findOne({
                "emails.address": email
            });
            if (oldUser != null) {
                if (oldUser.services == null) {
                    oldUser.services = {};
                }
                if (service === "google" || service === "facebook") {
                    oldUser.services[service] = user.services[service];
                    Meteor.users.remove(oldUser._id);
                    user = oldUser;
                }
            } else {
                if (service === "google" || service === "facebook") {
                    if (user.services[service].email != null) {
                        user.emails = [
                            {
                                address: user.services[service].email,
                                verified: true
                            }
                        ];
                    } else {
                        throw new Meteor.Error(500, "" + service + " account has no email attached");
                    }
                    user.profile.name = user.services[service].name;
                }
            }
        }
    }
    return user;
});

userAddOauthCredentials: function(token, userId, service) {
        var data, oldUser, selector, updateSelector;
        switch (service) {
            case "facebook":
                data = Facebook.retrieveCredential(token).serviceData;
                break;
            case "google":
                data = Google.retrieveCredential(token).serviceData;
        }
        selector = "services." + service + ".id";
        oldUser = Meteor.users.findOne({
            selector: data.id
        });
        if (oldUser != null) {
            throw new Meteor.Error(500, ("This " + service + " account has already") + "been assigned to another user.");
        }
        updateSelector = "services." + service;
        Meteor.users.update(userId, {
            $set: {
                updateSelector: data
            }
        });
        if (!_.contains(Meteor.user().emails, data.email)) {
            return Meteor.users.update(userId, {
                $push: {
                    "emails": {
                        address: data.email,
                        verified: true
                    }
                }
            });
        }
    }

inside client js folder :

var addUserService;

addUserService = function(service) {
    if (service === "email") {
} else {
    switch (service) {
        case "facebook":
            return Facebook.requestCredential({
                requestPermissions: ["email", "user_friends", "manage_notifications"]
            }, function(token) {
                return Meteor.call("userAddOauthCredentials", token, Meteor.userId(), service, function(err, resp) {
                    if (err != null) {
                        return Meteor.userError.throwError(err.reason);
                    }
                });
            });
        case "google":
            return Google.requestCredential({
                requestPermissions: ["email", "https://www.googleapis.com/auth/calendar"],
                requestOfflineToken: true
            }, function(token) {
                return Meteor.call("userAddOauthCredentials", token, Meteor.userId(), service, function(err, resp) {
                    if (err != null) {
                        return Meteor.userError.throwError(err.reason);
                    }
                });
            });
    }
}

};

same js file inside template events:

"click a": function(e) {
       var service;
        e.preventDefault();
        service = $(event.target).data("service");
        return addUserService(service);
    }

and for the html just done this:

<div class="social"><a id="fb" data-service="facebook"><img src="/../facebook.png"></a></div>
    <div class="social"><a id="go" data-service="google"><img src="/../googleplus.png"></a></div>

mainly you need to have the data-service set to your service, then the template click event takes the data-service and execute the addUserService(data-passed).

hope it will work, please let me know.