Changing or creating a User's Role in Redmine

gistfile1.rb

# Changing the current user's Role
def change_role(role, project)
  # User logged in?
  if User.current.logged?
    # Will get the existing Member object or a new one if the User isn't yet a Member of the project
    member = Member.find_or_initialize_by_user_id_and_project_id(User.current, project.id)

    member.role = role
    member.project = project

    if member.save
      # Successfully saved
    else
      # Had an error saving.  Should inform the user and recover.
    end
  end
end
  
change_role(Project.find(params[:project_id]), Role.find(42))