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stored in session and later changes their login The old login would remain in the session and would therefore be stale. This can cause problems if the underlying User model changes. Your entire object could become stale, potentially causing a NoMethodError when accessing attributes that didn t exist on the model at the time it was placed in session. The best bet is to just store the id. With a reference to the logged-in user safely stored in session, you can redirect to the root path, corresponding to the articles controller. If the assignment doesn t take place and the User.authenticate method returns nil, you know the provided login and password are invalid, and you return to the login page with an alert message using flash.now. RESTfully speaking, the login page is where you enter the new session information, so it s basically the new action.

The default value is nil, as typically you use puts instead when you want to append a newline to data being sent $FS and $FIELD_SEPARATOR (aliases for $;) can be set or read, and contain the default separator as used by String s split method Changing this and then calling split on a string without a split regex or character can give different results than expected..

Loaded suite test/unit/event_test Started .. Finished in 0.133271 seconds. 2 tests, 2 assertions, 0 failures, 0 errors

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$RS and $INPUT_RECORD_SEPARATOR (aliases for $/) can be set or read, and contain the default separator as used for input, such as from gets. The default value is a newline (\n) and results in gets receiving one line at a time. If this value is set to nil, then gets would read an entire file or data stream in one go. $PID and $PROCESS_ID (alias for $$) return the process ID of the current program. This ID is unique for every program or instance of a program running on a computer, which is why tempfile uses it when constructing names for temporary files. It is read-only. $LAST_MATCH_INFO (alias for $~) returns a MatchData object that contains the results of the last successful pattern match. $IGNORECASE (alias for $=) is a flag that you can set or read from that determines whether regular expressions and pattern matches performed in the program will be case insensitive by default. This special variable is deprecated and only effective in Ruby 1.8 (not Ruby 1.9 or later). Typically, if you required this feature, you d use the /i flag on the end of a regular expression instead. $MATCH (alias for $&) contains the entire string matched by the last successful regular expression match in the current scope. If there has been no match, its value is nil. $PREMATCH (alias for $`) contains the string preceding the match discovered by the last successful regular expression match in the current scope. If there has been no match, its value is nil. $POSTMATCH (alias for $') contains the string succeeding the match discovered by the last successful regular expression match in the current scope. If there has been no match, its value is nil.

Our next move is to test updating. Add the test_should_update_event case, as shown in Listing 9-6.

NOTE flash.now differs from the regular flash call by setting a flash message that is only available to the current action. If you remember, regular flash makes messages available after a redirect.

Standard library documentation for English: http://www.ruby-doc.org/stdlib/libdoc/ English/rdoc/index.html

ERB is a templating library for Ruby that allows you to mix content and Ruby code. ERB is used as the main template system in Ruby on Rails when rendering RHTML views (see 13 for more information). Mixing Ruby code with other content results in a powerful templating system that s a little reminiscent of PHP.

def test_should_update_event event = events(:tiki_party) assert event.update_attributes(:title => 'New title') end

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