is there a way to write this clean?

So i have a flag to disable and enable a feature. and will based on the variable it has to toggle the flags

flag_a, flag_b, are my two feature flags and the variable input string can be none, all,flag_a, flag_b as a input string we could further add more flags like flag_c or flag_d too so on.

def input
  variable = stdin "value"
  update_flag(value.upcase)
end

def update_flag(value)
 case value
 when "ALL"
    toggle_flag(flag_a, true)
    toogle_flag(flag_b, true)
 when "FLAG_A"
    toggle_flag(flag_a, true)
    toogle_flag(flag_b, false)
 when "FLAG_B"
    toggle_flag(flag_a, false)
    toogle_flag(flag_b, true)
 when "NONE"
    toggle_flag(flag_a, flase)
    toogle_flag(flag_b, false)
end

def toggle_flag(name, flag)
  if flag
    Featureflag.user(@id).enable(name.to_sym)
  else
    Featureflag.user(@id).disable(name.to_sym)
  end
end 

i want a way to send the values to the variables this input is only send through console as input.

trying to make it dry and also make it optimistic along with it has to be easy for flexible methods note "input is only send through console as input" also if we add flag_C then we need to have a way to take multiple inputs which have to be enabled and rest has to be disabled

You don't need the when condition for this, you can just use the flag name to check if the feature needs to be enabled or disabled, like

def input
  variable = stdin "value"
  update_flag(value.upcase)
end

def update_flag(value)
  toggle_flag("flag_a", value)
  toggle_flag("flag_b", value)
end

def enable_feature?(name, flag)
  return true if flag == "BOTH"
  return false if flag == "NONE"

  flag.downcase == name
end

def toggle_flag(name, flag)
  if enable_feature?(name, flag)
    Featureflag.user(@id).enable(name.to_sym)
  else
    Featureflag.user(@id).disable(name.to_sym)
  end
end

UPDATE:

According to the suggestions:

In case of larger case statements

FLAGS = [
  "flag_a",
  "flag_b",
  "flag_c",
]

def input
  value = prompt_input("Enter value:").upcase
  update_flags(value)
end

def update_flag(value)
  FLAGS.each do { |flag_name| toggle_flag(flag_name, value) }
end

def enable_feature?(name, flag)
  return true if flag == "BOTH" || flag == "ALL"
  return false if flag == "NONE"

  flag.downcase == name
end

def toggle_flag(name, flag)
  if enable_feature?(name, flag)
    Featureflag.user(@id).enable(name.to_sym)
  else
    Featureflag.user(@id).disable(name.to_sym)
  end
end