Block the create service when there is the same information you're trying to create

[Mark Wong]

For example, if I have a list of names which get from the user collection, and when I click on the list item, then it will create a new row with the current user name and the name on the list item in another collection.
What I want to achieve is if there is already a row with your user name and your target name, then you cannot create a new one anymore,
How should I do that?

[Alena Prykhodko]

Here is a brief plan:

When create item you should:

1. Query db collection whether record already exists.
2. If yes - you return error and do not execute create service.
3. If not - you run create service .

[Mark Wong]

How do I set the query service to check whether did anything return?
Because whatever the where query is, the status is still 200 ok.
So I can't set the create service execute when error, because everytime is success

[Mark Wong]

I've use the response to map the hidden label and compare the value,
Answered!

[Yurii Orishchuk]

Hi Mark,

Thanks for this update.

Regards.