To dream of rice represents life situations that encourage you to follow good advice or make rational decisions. Rice may also represent logical choices to ensure reliable outcomes. Logical sound decisions.
Negatively, rice may reflect logical decisions that feel boring or a little bit empty.
To dream of spoiled rice in a dream may reflect good advice that you are unable to listen to or rational choices that you feel unable to stick with.
Example: A woman dreamed of trying to find some cooked rice, but could only find spoiled rice. In waking life she told a married man that she was having an affair with that they should put the relationship on hold until his wife calms down after finding the woman's phone number. She ended up being unable to stop the relationship. The spoiled rice may have reflected the rational choice to slow down the extra-marital affair that the woman found too difficult to stick with.