Let's say that I've got a method available in my workspace in Ruby. Is there a command I can use that will recover the fully qualified name of the method?
I'm looking for something similar to the which function in Matlab, that returns an unambiguous name for any argument it's given.
I ask because I'm writing a test in Cucumber that needs to send particular GET and POST requests. I have both get and post methods in my workspace, but I didn't import them myself and so I don't know where they came from. I want to look at the documentation for these methods. In order to find the documentation, I need to know what module they're defined in. I'm trying to get the fully qualified names in order to figure out which module they're from.
I figured it out. Andrew Marshall left a comment that pointed me in the right direction.
First I installed pry, by including it in my gemfile and running bundle install.
Then I inserted binding.pry into my test code. This dropped me into a pry session when I ran my tests.
In the pry session I typed the ls command, which listed all the variables in my context. I found get and post under Rack::Test::Methods#methods.
Rack::Test::Methods#methods: _current_session_names authorize basic_authorize build_rack_mock_session build_rack_test_session clear_cookies current_session delete digest_authorize follow_redirect! get head header last_request last_response options post put rack_mock_session rack_test_session request set_cookie with_session
So, one way to find out the FQN of a method in your workspace is to run Pry's ls command, and then examine the output.
Related
I'm trying to use my Engine in another app to test the install generator and it seems to be failing. I haven't used my install generator for a long time, so I'm not sure when it broke (or if it ever truly smoothly worked). My project is based off radar/forem, so I tried to borrow a lot of their code (including the generator).
Edit: My installer works for the engines test/dummy but not in other apps. Why?
GH issue: https://github.com/NJayDevelopment/mongoid_forums/issues/16
Here is the log:
$ rails g mongoid_forums:install
What is your user class called? [User]
What is the current_user helper called in your app? [current_user]
Defining mongoid_forums_user method inside ApplicationController...
insert app/controllers/application_controller.rb
Adding mongoid_forums initializer (config/initializers/mongoid_forums.rb)...
create config/initializers/mongoid_forums.rb
(erb):5:in `template': undefined method `per_page' for MongoidForums:Module (NoMethodError)
The route is successfully added, however the initializer/mongoid_forums.rb is a blank file. The method is defined exactly how radar/forem does it, what could be the error?
Here is the relevant code:
Per page method definition: https://github.com/NJayDevelopment/mongoid_forums/blob/master/lib/mongoid_forums.rb#L33
Mattr accessor:
https://github.com/NJayDevelopment/mongoid_forums/blob/master/lib/mongoid_forums.rb#L9
Initializer template:
https://github.com/NJayDevelopment/mongoid_forums/blob/master/lib/generators/mongoid_forums/install/templates/initializer.rb
Install generator at error point:
https://github.com/NJayDevelopment/mongoid_forums/blob/master/lib/generators/mongoid_forums/install_generator.rb#L47
Turns out when you try requiring mongoid_forums in pry, you'll see that an error involving decorators occurs. The issue is fixed here in my pull request to decorators: parndt/decorators#13
It's because of the way files are required and how load! is called over there.
Waiting on PR status, that is the same version that radar/forem uses as well.
I have a Rails application, and I'm trying to export data, but directly through Pry because I only need to do it once.
Is this possible with Pry? I looked at the documentation but doesn't seem like there's an easy way to dump console data anywhere.
I have a hash, with nested hashes/objects, which I need to send over to a 3rd party for work with an API. They need a dump of the data so they can set up the receiving end of my call. I'm just going to do this in Ruby now, but it would have made more sense to dump the data through PRY, rather than edit my ruby object to dump the data, which I only need once.
If you can start the server from a local command-line, or SSH to the host and run an instance there, you can use Pry for this. Basically you need to add these lines to your code at the appropriate place:
require 'pry-debugger'; binding.pry
which will stop your code and put you at the Pry prompt. At that point you can enter something like:
require 'json'
File.write('test.data', hash.to_json)
Read the Pry.debugger documentation for information about using Pry with remote Rails sessions, which might work better for you.
You can also export any string into a file (here output.txt):
x = 'something funky'
.echo '#{x}' > output.txt
Just be careful with quotes in the string. These may lead to problems in the shell.
I have been trying to use the Rails profiling tools. I am using a very simple example taken from the docs at http://guides.rubyonrails.org/performance_testing.html that looks like this
require 'test_helper'
require 'rails/performance_test_help'
# Profiling results for each test method are written to tmp/performance.
class BrowsingTest < ActionDispatch::PerformanceTest
def test_homepage
get '/'
end
end
I then run the test using
rake test:profile
but it crashes with the following error
Error during failsafe response: undefined method `controller_name' for nil:NilClass
I suspect that the problem is that the app serves multiple domains and so simply using get '/' is not enough information to resolve the url back to a controller/action - it needs a host as well. However the usual ways of specifying a host (#host, #request.host, default_url_options[:host]) either don't work or cause another error (eg #request is nil).
I have also tried entering the full url. I have the different hosts defined as constants in the test environment so this looked something like
get "http://#{HOST_1}/"
In this case the rake task completed successfully but no profiling information appeared on the command line and no files were generated.
I haven't really used the profiling tools in Rails much so I am hoping I am missing something obvious. Any pointers would be much appreciated.
Cheers
Context:
I pulled the most recent code from the repository and tried to make sure that the changes I was about to push up were going to work with that version of the code. This is a Ruby on Rails application. Also worth noting is the fact that when running the main application that I pulled from on the web, this error does not show up. But if I run my branch or the main branch cloned onto my environment, the error always shows up for every url I try. So it is on my end.
Problem:
As soon as I go to localhost:3000, I get the following error:
NoMethodError in HomeController#index
undefined method `-#' for #<ActionDispatch::Response:0x64fd460>
What I've Tried:
I have asked my question on the #rubyonrails IRC channel and nobody was able to determine what was going on through the Full Trace (I haven't posted it here because I wasn't sure what was the best way to do that on here; it didn't look very good in the code block or block quote). I have looked at my HomeController's index method, which is defined as such:
def index
#groups = #current_user.groups
#things = Thing.where(:group_id => #groups.map{|e|e.id})
end
I have also Googled around and haven't found what I need to fix the problem.
What I've Learned So Far:
-# is an operator. Some people may receive a similar error in assuming that Ruby has the shortcut to
variable = variable + 1
that a lot of other languages have:
variable++
Here is an example of that case: Undefined method `+#' for false:FalseClass (NoMethodError) ruby
Question:
Does anyone have any further suggestions on how to find the issue here? Also, if I could easily put the Full Trace on here, formatted in an aesthetically pleasing manner, would someone tell me how? I'm at a loss with this one :(
Update (2/8/2013):
It seems that the issue does not necessarily reside in the HomeController nor home/index.html.erb View. I have attempted to access ANY url with a valid action and the same error occurs with "NoMethodError in..." changing to the corresponding [...]Controller#index.
Update (2/9/2013):
Since this error happens no matter what url I try to navigate to, I decided to look in the routes.rb file in the config folder. I ran my server through rubymine instead of the command line this time, which made it a little easier to read for me. I started looking through all the spit out and I noticed an interested line that consisted of:
["private-key looking thing"] [127.0.0.1] Started GET "/" for 127.0.0.1 at 2013-02-09 18:20:52 -0700
It seems like there is a syntactical error in routes.rb (that's my best guess at this point). This does not explain why this only is an issue on my local environment with the same code sets, but what else do I have to go off of?
Does anyone have any suggested things to be on the look out for while I sift through this file? Not really sure what to be looking for as far as errors are concerned. Rubymines inspection stuff converted all my double quotes to single quotes and doesn't really have anything else to complain about.
Thanks in advance,
Jake Smith
I am guessing it might as well be an syntactical error in the corresponding view page Home/index.html.haml .. I am suspecting there is unintended '-' in front of variable call. I tried to simulate a similar scenario in my rails platform and see following page on browser
undefined method `-#' for false:FalseClass
Correct lines of code
%h1 All Movies
= "filtervalue=#{#isFilterOld}"
= "Sortvalue=#{#isSortOld}"
Edited to simulate the error (observe the - in front of isFilterOld variable)
%h1 All Movies
= "filtervalue=#{-#isFilterOld}"
= "Sortvalue=#{#isSortOld}"
I have fixed the issue!
What fixed it:
Go to the directory where your gems are (for me that was C:\RailsInstaller\Ruby1.9.3\lib\ruby\gems\1.9.1)
Delete all gems except for bundler
Make sure you delete the gems from the /cache/, /gems/, and /specifications/ folders (I just deleted them from the /gems/ folder at first and bundle install indicated that it could still find the gems)
Run bundle install
Further Inquiry:
Does anybody have any idea why this worked? I don't know if at this point I can narrow down which gem was causing the issue because the app is working now (I can visit all the urls with corresponding views). If the issue comes up again, I will delete gems one by one to nail down which one was at least causing the issue for me. But if anyone has any insight on this, a more detailed answer would be greatly appreciated by many more people than just me, I think. Thanks to all who helped thus far!
Im trying to figure out why ruby omnicompl only works sometimes for me.
Here it's working as expected.
But when I try the same thing on the same ivar 2 lines down I get "Pattern not found"
Both are done the same way, typing out #current_user_session.fiCtrl+X+O
I checked tpopes rails.vim github page for open/closed issues and tried to google it without luck.
My macvim and vim is compiled with +ruby
:echo &omnifunc returns rubycomplete#Complete
:Rails! returns rails.vim 4.3 (Rails-controller)
I have my complete vimdir on github for reference.
one would imagine that it's because in img2 it's now below the setting of the variable (#current_user_session = UserSession.find).
which means that as this is now an instance it's looking for instance methods, whereas before it was returning the class method.
e.g.
User.find # => fine
user = User.find
user.find # => Method not found
to demo the difference run these:
User.methods.sort
User.find.methods.sort
you'll see that it's quite different. put bluntly you're trying to look up 'find' for a user you have. "'tom'.find" doesn't make any sense.