revise children and parents image uploading
allow update card number in relationship
fix relationship tests
update image resource
revise index page style
add a basic chat room for superadmin
construct url base on hostname
tuning chat page style
distinguish action from message
add action to chat room
disable add class button while saving data
add short key for sending message in chat
revise column width, and name alias
support emoji in chat
filter class by user access
adopt classes accessibility on frond end
restrict parent interface with class access
add spec for parent access controller
test filter method in UserAccess
add restriction to children interface