code: func (a Associations) AssociationsCreatableStatement() []AssociationCreatableStatement {
  	var stm []AssociationCreatableStatement
  	for i := range a {
  		if _, ok := a[i].(AssociationCreatableStatement); ok {
  			stm = append(stm, a[i].(AssociationCreatableStatement))
  		}
  	}
  	return stm
  }
docs: // AssociationsCreatableStatement returns all associations that implement AssociationCreatableStament
  // interface. Many To Many association is an example of this implementation.