Code generation is becoming one of the most important tools in an Integrated Development Environment (IDE) for programmers, be they novices or experts. It allows them to produce code faster, avoid typos and other mistakes, be more efficient and easily turn ideas into code. As such, there are many in-IDE code generation models to choose from, each with their own promises, functionalities and implementation techniques. This report presents the results of a literature survey into the code generation models that have been integrated into programming environments and serves as an overview and analysis of them. The results of this paper provide a set of guidelines for code generation that have been summarized from the selected literature.