CODEWITHSUNDEEP
javascriptparse-platformionic2parse-server
Marcos T. Gobriel
Marcos T. Gobriel

Reputation: 121

how to decrement in parse server javascript sdk

in parse documentation there is something about increment

parse server increment reference code

i need to achieve a decrement function to decrease the parse column by 1 each time this function is called but i can not find it in the documentation

here is my code

       // we will decerment unread count
   const ConversationObject = Parse.Object.extend("conversations");       
   var fromconvQuery = new Parse.Query(ConversationObject);         
   fromconvQuery.equalTo("from", this.currentUser);
   fromconvQuery.equalTo("to", this.to);

   var toconvQuery = new Parse.Query(ConversationObject);  
   toconvQuery.equalTo("from", this.to);
   toconvQuery.equalTo("to", this.currentUser);

   var mainconvQuery = Parse.Query.or(fromconvQuery, toconvQuery);
   mainconvQuery.first({
     success: function(conv){
      conv.decrement('unreadCount')
      conv.save()
     }
   })

Upvotes: 0

Views: 716

Answers (1)

toddg
toddg

Reputation: 2906

All you need to do is specify a negative amount:

conv.increment('unreadCount', -1);
conv.save();

Upvotes: 4

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