Express.js - 检查用户是否已经关注并显示取消关注按钮

Question

我已经成功做到了，这样用户就可以互相关注了。当您点击关注时会发生什么情况，它会将您的用户 ID 推送给您点击关注的用户的关注者，然后它会将您点击关注的用户的 ID 推送到当前用户关注部分中。

现在我正在尝试这样做，以便当您进入个人资料页面时，如果您不关注用户，它将显示“关注”，如果您已经关注，则会显示“取消关注”。我试图让它遍历用户关注者，以查看其中一个 id 是否与当前用户 id 匹配。但无论我做什么，我都无法得到正确的结果。

我查看用户资料的途径是：

router.get("/profile/:id", middleware.isLoggedIn, function(req, res) {
    User.findById(req.params.id).populate("followers").exec(function(err, foundUser) {
        if (err) {
            req.flash("error", "Ooops! Seems like there are no users with this id.");
            res.redirect("back");
        }
        else {
            Mappin.find().where("author.id").equals(foundUser._id).exec(function(err, foundMappins) {
                if (err) {
                    req.flash("error", "Something went wrong trying to find the map markers from this user.");
                    res.redirect("back");
                }
                else {
                    Blogpost.find().where("author.id").equals(foundUser._id).exec(function(err, foundBlogposts) {
                        if (err) {
                            req.flash("error", "Something went wrong trying to find the blogposts from this user.");
                            res.redirect("back");
                        }
                        else {
                            Post.find().where("author.id").equals(foundUser._id).exec(function(err, foundPosts) {
                                if (err) {
                                    req.flash("error", "Something went wrong trying to find the posts from this user.");
                                    res.redirect("back");
                                }
                                else {
                                    res.render("webapplication/user/userprofile", { user: foundUser, mappin: foundMappins, blogpost: foundBlogposts, post: foundPosts });
                                }
                            });
                        }
                    });
                }
            });
        }
    });
});

当我尝试检查用户是否已经关注时，我正在我的用户视图中执行以下操作：

                                <% user.followers.forEach(function(follower) { %>
                                <% if(currentUser && follower._id.equals(currentUser._id)){  %>
                                    <div class="Button-Collection">
                                        <a href="/profile/<%= user.id %>/follow" class="Button Add" title="Unfollow <%= user.firstName %>">Unfollow</a>
                                    </div>
                                <% } %>
                                <% if (currentUser && !follower._id.equals(currentUser._id)) { %>
                                    <div class="Button-Collection">
                                        <a href="/profile/<%= user.id %>/follow" class="Button Add" title="Follow <%= user.firstName %>">Follow</a>
                                    </div>
                                <% } %>
                                <% }); %>

我的用户架构：

var mongoose = require("mongoose");
var passportLocalMongoose = require("passport-local-mongoose");

var UserSchema = new mongoose.Schema({
    username: String,
    password: String,
    avatar: String,
    firstName: String,
    lastName: String,
    email: { type: String, unique: true },
    resetPasswordToken: String,
    resetPasswordExpires: Date,
    gender: String,
    createdAt: { type: Date, default: Date.now },
    comments: [ // Allows users to comment on business profiles and allows businesses to showcase their comments
        {
            type: mongoose.Schema.Types.ObjectId,
            ref: "Comment"
        }
    ],
    posts: [ // Allows users to comment on business profiles and allows businesses to showcase their comments
        {
            type: mongoose.Schema.Types.ObjectId,
            ref: "Post"
        }
    ],
    followers: [{
        type: mongoose.Schema.Types.ObjectId,
        ref: 'User'
    }],
    following: [{
        type: mongoose.Schema.Types.ObjectId,
        ref: 'User'
    }],
    blogPosts: [ // Allows admins to see and write blogposts for the website
        {
            type: mongoose.Schema.Types.ObjectId,
            ref: "Blogpost"
        }
    ],
    mapPins: [ // Allows admins to see and write blogposts for the website
        {
            type: mongoose.Schema.Types.ObjectId,
            ref: "Mappin"
        }
    ],
    businessLocations: String,
    businessBiography: String,
    businessLogo: String,
    businessName: String,
    businessWebsite: String,
    businessFacebook: String,
    businessTwitter: String,
    businessYoutube: String,
    businessLinkedin: String,
    isAdmin: { type: Boolean, default: false },
    isBusiness: { type: Boolean, default: false },
    isUser: { type: Boolean, default: false },
    facebookId: String,
    facebookToken: String,
    facebookEmail: String,
    googleId: String,
    googleToken: String,
    googleEmail: String
});

UserSchema.plugin(passportLocalMongoose);

module.exports = mongoose.model("User", UserSchema);

我也尝试过 for(var i = 0; i

我真的希望你们中的一个人能够帮助我解决这个谜题，因为我无法自己解决这个问题。

Answer 1

Michael，尝试使用 == 来比较 id：

follower._id == currentUser._id