Big Data application developers use NoSQL systems to store massive DBs. They transform a conceptual model describing the massive DB into a NoSQL physical model. This manual task is complex because of the specificity of NoSQL models. Our purpose is to assist the developer to automatically transform models. For this, we use the MDA architecture. Starting from a conceptual model that describes the structure of data and a set of constraints, we propose a mapping rules that generate (1) a NoSQL physical model and (2) the code for checking constraints. The first point have been addressed in previous work. In this paper, we study the second point that aims to propose an automatic process for mapping constraints.