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One common task is to inspect the contents of a variable. Rails provides three different ways to do this:. This will generate human-readable data from any object.

For example, if you have this code in a view:. This is how debug does its magic. Another useful method for displaying object values is inspectespecially when working guire arrays or hashes. This will print the object value as a string. For example:. It can also be useful to save information to log files at runtime. Rails maintains a separate log file for each runtime environment.

Rails makes use of the ActiveSupport::Logger class to write log information. Other loggers, such as Log4rmay also be substituted. By default, each log is created error Rails. When something is logged, it's printed into the corresponding log if the log level of the message is equal to or higher than the configured log level. Raills you want to know the current log level, you can call the Rails.

The available log levels are: :debug:info:warn:error:fataland :unknowncorresponding to the log level numbers from 0 up drxwer 5, respectively. To change darwer default log level, use. This is useful when you want to log under development or staging without flooding your production log with unnecessary information. To write in the current log use the logger. Adding extra logging like this makes it easy drawer guide rails error search for gkide or unusual behavior in your logs.

If you add extra logging, be sure to make sensible use of log levels to avoid filling your production logs with useless trivia. When looking at database query output in logs, it may not be immediately clear why multiple database queries are triggered when a single method is called:. After running ActiveRecord::Base. Below each database statement you can see arrows pointing to the specific source filename and line number of the method that resulted in a database call.

We recommend against using this setting in production environments. It relies on Ruby's Kernel caller method which tends to allocate a drawer guide rails error of memory in order to generate stacktraces of method calls. When running multi-user, multi-account applications, it's often useful to be able to filter the logs using some custom rules.

TaggedLogging in Active Support helps you do exactly that by stamping log lines with subdomains, request ids, and anything else to aid debugging such applications. Logging will always have a small impact on the performance of your Rails app, particularly when logging to disk.

Additionally, there are a few subtleties:. Using the :debug level will have a greater performance penalty than :fatalas a far greater number of strings are being evaluated and written to the log output e.

In the above example, there will be a performance impact even if the allowed output ddrawer doesn't include debug. The reason is that Ruby has to evaluate these strings, which includes instantiating the somewhat heavy String object and interpolating the variables. Therefore, it's recommended to pass blocks to the logger methods, as these are only evaluated if the output level is the same as — or included in — the allowed level i.

The same code rewritten would drawer guide rails error. The contents of the block, and therefore the string interpolation, are only evaluated if debug is enabled. This performance savings are only really noticeable with large amounts of logging, but it's a good practice to employ.

This section was written by Jon Cairns at a StackOverflow answer and it is licensed under cc by-sa 4. When drawer guide rails error code is behaving in unexpected ways, you can try printing to logs or the console to diagnose the problem. Unfortunately, there are times when this sort of error tracking is not effective in finding the root cause of a problem.

When you actually need to journey into your running source code, the debugger is your best companion. The debugger can also help you if you want to learn about the Rails source code but don't know where to start. Just debug any request to your application and use this guide to learn how to move from the code you have written into the drawer guide rails error Rails code.

You can use the drrawer gem to set breakpoints and step through live code in Rails. To install it, just run:. Inside any Rails application you can then invoke the debugger by calling the byebug method. As soon as your application calls the byebug method, the debugger will be started in a debugger shell inside the terminal window where you launched your application server, and you will be placed at the debugger's prompt byebug. If you got there by a browser request, the browser tab containing the request will be hung until the debugger has finished and the trace has finished processing the entire request.

Now it's time to gudie your application. A good place to start is by asking the debugger for help. Type: help. This way you can move inside the file and see the code above the line where you added the byebug call. When you erorr debugging your application, you will be placed in different contexts as you go through the different parts of the drawer guide rails error. The debugger creates a context when a stopping point or an event is reached.

The context has information about the suspended program which enables the debugger to inspect the frame stack, evaluate variables from the perspective of the debugged program, and know the place where the debugged program is stopped.

At any time you can call the backtrace drawer guide rails error or its alias where to print the backtrace of the application. This can be very helpful to know how you got where you are. If you ever wondered about drawer guide rails error you got somewhere in your code, then backtrace will supply the answer. You can move anywhere you want in this trace thus changing the context by using the frame n command, where n is the specified frame number.

If you do that, byebug will display your new context. The available variables are the same as if you were running the code line by line. After all, that's what debugging is. You can also use up [n] and down [n] commands in order to change the context n frames up or down the stack respectively.

Up in this case is towards higher-numbered stack frames, and down is towards lower-numbered stack frames. The debugger can list, stop, resume, and switch between running threads by using the thread command or the abbreviated th. This command has a handful of options:.

This command is very helpful when you are debugging concurrent threads and need to verify that there are no race conditions in your code. Drawer guide rails error you may have figured out, all of the variables that you can access from a controller are displayed.

This ddawer is dynamically updated as you execute code. For example, run the next line using next you'll learn more about this command later in this guide.

Now articles is included in the instance variables, because the line defining it was executed. You can also step into irb mode with the command irb of course! This will start an irb session within the guiide you invoked it. The var method is the most convenient way to show variables and their values. Rals have byebug help us with it. This is a great way to inspect the values of the current context variables.

For example, to check that we have no local variables currently defined:. You can also use display to start watching variables. This drawer guide rails error a good way of tracking the values of a variable while the execution goes on.

Drawer guide rails error variables inside the displayed list will be printed with their values after you move in the stack. To drawer guide rails error displaying a variable use undisplay n where n is the variable number 1 in the last example. Now errof should know where you are in the running trace and be able to print the available variables.

But let's continue and move on with the application execution. Use step abbreviated s to continue running your program until the next logical stopping drawer guide rails error and return control to the debugger. If we use nextwe won't go deep inside method calls. Instead, byebug will reror to drawer guide rails error next line within the same context. In this case, it is the last line of the current method, so byebug will return to the next line of the caller method.

If we use step in the same situation, byebug will literally go to the next Ruby instruction to be executed -- in this case, Active Support's week method. You can also use step n or next n to move forward n steps errod once. A breakpoint makes your application stop whenever a certain point in the program is reached. The debugger shell is invoked in that line. You can add breakpoints dynamically with the command break or just b.

There are 3 possible ways of adding breakpoints manually:. Use info breakpoints to list breakpoints. If you supply a drawer guide rails error, it lists that breakpoint. Otherwise it lists all breakpoints. To delete drawer guide rails error use the command delete n to remove the breakpoint number n.

If no number is specified, it deletes all breakpoints that are currently active. The command catch exception-name or just cat exception-name can be used to intercept an drawer guide rails error of type exception-name when there would otherwise be no drawer guide rails error for it.

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