How to store multiple object reference in one field?

Suppose, I have a model 

                class Project(models.Model):

                        name = models.CharField(max_length=50)

Another model,

               class Manager(models.Model)

                         name = models.CharField(max_length = 50)

                         projects = ArrayField( models.Foreignkey(Project, on_delete=models.PROTECT) )

Here, projects field would be an array of Project object. But it is PostgreSQL specific. How can I implement this so that it will be useful for every database?               

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