frijoles dulces.
The Spanish word for Beans is frijoles or Habichuelas
There are a few ways to say beans in Spanish: frijoles, alubias, habichuelas. The word choice also depends on the type of beans you are describing.
You do not say what kind of beans you have, but being an avid bean eater I can tell you that most beans including white beans are not naturally sweet. They get that way when cooks add sugar.
The beans are good = los granos son buenos
So sweet. = Tan dulce.
eres dulce
ricura
You can say "Primer grado es dulce" in Spanish. This phrase captures the idea that first grade is sweet or enjoyable.
muy dulce
Ella es dulce.
dulces sueños
There is not exact Spanish equivalent of this. You could say"Mi amorcito" or "Mi corazoncito"