Avoid adding duplicate elements by redirecting to the already existing element

Question

Avoid adding duplicate elements by redirecting to the already existing element

Here is my method for adding elements to a list, which contains links to articles, using an input field:

Template.addForm.events({
    'submit form': function(event){
        event.preventDefault();
        var title = event.target.text.value;    
        MongoValues.insert({
            title: title,
            slug: title.toLowerCase()
        }, function(error, result) { if(error) console.warn(error); });
        event.target.text.value = "";
    }
});

I am now working on preventing duplicate entries. If a user wants to add a title that already exists, I want to redirect them to the existing element (route to article/_id) instead of adding the title to the list again.

javascript mongodb meteor

Answer 1

Answer №1

Suppose you are utilizing iron:router and have a route setup like below :

Router.route('post/:_id', {
    name: 'post'
    // other route configurations
});

To modify your code, consider the following:

Template.createForm.events({
    'submit form': function(event){
        event.preventDefault();
        var title = event.target.text.value; 
        var existingPost = PostCollection.findOne({title : title});
        if (!!existingPost) { 
          // post with the same title exists, navigating to that post
          Router.go("post", {_id : existingPost._id});
        } else {   
          // new post creation as the title does not exist
          PostCollection.insert({
              title: title,
              slug: title.toLowerCase()
          }, function(error, result) { 
            if(error) {
              console.warn(error); 
            }
          });
          event.target.text.value = "";
      }
    }
  });

Please note that this method will not prevent duplicates if someone inserts data directly through the console.

If you are using Collection2 and SimpleSchema, you can enforce uniqueness on the title field by setting "unique: true". Here's an example of how to do so:

title : {
   type: String,
   unique: true
}

Answer 2

Suppose you are utilizing iron:router and have a route setup like below :

Router.route('post/:_id', {
    name: 'post'
    // other route configurations
});

To modify your code, consider the following:

Template.createForm.events({
    'submit form': function(event){
        event.preventDefault();
        var title = event.target.text.value; 
        var existingPost = PostCollection.findOne({title : title});
        if (!!existingPost) { 
          // post with the same title exists, navigating to that post
          Router.go("post", {_id : existingPost._id});
        } else {   
          // new post creation as the title does not exist
          PostCollection.insert({
              title: title,
              slug: title.toLowerCase()
          }, function(error, result) { 
            if(error) {
              console.warn(error); 
            }
          });
          event.target.text.value = "";
      }
    }
  });

Please note that this method will not prevent duplicates if someone inserts data directly through the console.

If you are using Collection2 and SimpleSchema, you can enforce uniqueness on the title field by setting "unique: true". Here's an example of how to do so:

title : {
   type: String,
   unique: true
}

Avoid adding duplicate elements by redirecting to the already existing element

Answer №1

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