NoMachine technology revolutionizes the way users access their computing resources across the Internet by making remote access to desktops and applications as easy and widespread as Web browsing.
they have different syntax, the former uses select_tag, field_text_tag, all ends with “_tag”
the latter, just f.select, f.field_text
form_for is for creating forms for one specific object/Model. It is less flexible, but saves you some typing as you don’t have to pass the model name in the element helpers over and over again.
form_tag (as all *_tag helpers) are not bound to that limitation. You could create a totally customized form that uopdates 2 1/2 different Models at the same time
destroy/:destroy_all The associated objects are destroyed alongside this object by calling their destroy method
:delete/:delete_all All associated objects are destroyed immediately without calling their :destroy method
You want to create a button in Rails that is equal to:
<%= submit_tag “Test me!”, :type => ‘button’, : onclick => ‘alert(“It works!”)’ %>
These are ways to calculate a unique hash value for a file; so instead of comparing two files to check if they are the same, we can compare the codes/hash value; And we don’t need to store files, we only need to store the codes.
md5 = Digest::MD5.hexdigest(File.read('path_to_file'))
sum filename1 filename2
and then compare the numbers
Calculate a CRC32:
require 'digest/crc32' Digest::CRC32.hexdigest('hello') # => "3610a686"
Calculate a CRC32 of a file:
Digest::CRC32.file('README.md') # => #<Digest::CRC32: 127ad531>