How can I relate two objects in javascript?

Question

I had create two objects: User and Blog and I need to associate both of them. My thought was to create an ID for each and then make the association. The ID is created through array.length at the moment of creating an instance.

The associateUserWithBlog functions stores the blog with respective user. At user instance I define an array for store all blogs create by user. My question is if there is another way to do this association. I'll need later print all the blogs and its owner(user) and sometimes I struggling to print.

function User(name, level, title, id, entry, comment) {
     this.name = name;
     this.level = level;
     this.title = title;
     this.id = id;
     this.entry = entry;
     this.comment = comment;
}

function Blog(blogID, title, userID, blogText) {
     this.blogID = blogID;
     this.title = title;
     this.userID = userID;
     this.blogText = blogText;
     this.comment = comment;
}

users = new Array();
blogs = new Array();

function associateUserWithBlog(userID, entryID) {
    users[userID].entry = entryID;
}

// user with id = 0
userID = users.length
var user = new User(userID, "Bob", "Student", "Mr", new Array())

// blog with id = 0 and user associate with id = 0
blogID = blogs.length
var blog = new Blog(entries.length, "Blog 1", 0, "Welcome Blog 1");

associateUserWithEntry(userID, blogID);

You could associate them quite directly by setting one as the property of another: Blog.user = new User('name', 'level', ...). — Charlie Schliesser
– Charlie Schliesser, Commented Oct 23, 2015 at 1:24
You should rather keep blogs inside the user as an association. As User to Blog relationship is one to many, I suggest you create an array of blogs inside a user object. That way deletion of a blog will not delete the user. Deletion of a user will delete all his blogs. — santon
– santon, Commented Oct 23, 2015 at 1:35

santon · Accepted Answer · 2015-10-23 01:55:34Z

2

The following creates a user with any number of blogs owned by him as an association.

You can add more specific behaviors to the user object and convert it into a module pattern. I have added a snippet which gives a brief outline of such an object.

function createUser(userOpts) {
    //private members
     var name = userOpts.name;
     var level = userOpts.level;
     var title = userOpts.title;
     var id = userOpts.id;
     var entry = userOpts.entry;
     var comment = userOpts.comment;
     var blogs = userOpts.blogs || [];
  return {  
      
      //All methods to manipulate private data
    
     createBlog:function() {...} 
     getBlogs: function() { return blogs.slice(); }
     //...other methods
  };  
 }
  
 
  var user = createUser(opts);

answered Oct 23, 2015 at 1:55

santon

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