Modifies the amount of an integer value that is stored in the cache. If the
key is not found it is created and set to amount.
# File activesupport/lib/active_support/cache/file_store.rb, line 211
def modify_value(name, amount, options)
file_name = normalize_key(name, options)
lock_file(file_name) do
options = merged_options(options)
if num = read(name, options)
num = num.to_i + amount
write(name, num, options)
num
else
write(name, Integer(amount), options)
amount
end
end
end
