Render Conditions - render if a value is in any row in a model?

Questions
1

Is there any way to accomplish this?

I want to render if the value of my field is in any row of a model. Is there a way to access all the rows with merge syntax? Or do I have to do the conditional rendering with javascript/jquery?

2

Use another model with the condition you have to determine this. 

  1. Id in first model Id’s
  2. field = Value x
Then just be sure to update the model everytime you need to in order to know.