In side a rails app, after setting a breakpoint inside an action method of controller using byebug
, when I type some gibberesh, I find that a method from my application_controller.rb is automatically executed before printing out "undefined local variable or method"
How is this magic happening? How do I trace this... I don't want this method run when gibberish is typed...
(byebug) abcd1234abcd1234
WpPost Load (4.8ms) SELECT `wp_posts`.`post_title`, `wp_posts`.`post_date`, `wp_posts`.`post_name` FROM `wp_posts` WHERE `wp_posts`.`post_status` = 'publish' AND (post_date_gmt >= '2017-01-30 23:31:52.437270') ORDER BY post_date DESC LIMIT 3
*** NameError Exception: undefined local variable or method `abcd1234abcd1234' for #<FooController:0x007fa717745bd8>
nil
(byebug)
Some code
# foo_controller.rb
class FooController < ApplicationController
def show
byebug # I type abcd1234abcd1234 at this prompt
# ...
# application_controller.rb
class ApplicationController < ActionController::Base
before_filter :something
before_filter :something2
before_filter :load_blog_posts, :something3
def ....
end
def load_blog_posts
@wp_posts = WpPost.where(post_status: 'publishh')
.where("post_date_gmt >= ?", Time.now - 1.week )
.order("post_date DESC")
.limit(3)
.select(:post_title, :post_date, :post_name)
end
EDIT 2:
I think that the SQL statement is just printing to the log late.
Does it happen a second time if you type abcd1234abcd1234
a second time? I don't think it will.
Also, you could try changing the statement to make some kind of benign change to an object, and if you at the same time run a rails c
console, you'll see that the change has already taken place once it gets to the byebug
statement, it just simply hasn't printed to STDOUT yet.
I was able to test this in a test app by loading entire DB tables with code like this:
def show
User.all
Thing.all
byebug
end
And I would get this:
(byebug) ksjdfiisddjfj
User Load (0.5ms) SELECT "users".* FROM "users"
Thing Load (0.5ms) SELECT "things".* FROM "things"
*** NameError Exception: undefined local variable or method `ksjdfiisddjfj' for #<ThingsController:0x007ff7cbe771e0>
nil
(byebug) sdfsdf
*** NameError Exception: undefined local variable or method `sdfsdf' for #<ThingsController:0x007ff7cbe771e0>
nil
(byebug)
EDIT:
The behavior of filters are inherited so every before_action in your application_controller will be run before every method of the classes that inherit from that controller.
Here's a link to the docs: http://edgeguides.rubyonrails.org/action_controller_overview.html
See section 8 Filters
.
If you simply do not what that action to run before your show
method, then you can add a skip_before_action :load_blog_posts, only:[:show]
.
I think what you want to do, is introduce your byebug
call as the first before_action:
1: class SomethingController < ApplicationController
=> 2: before_action { byebug }
3: before_action :validate_current_something
4: before_action :validate_permissions_for_something, only: [ :edit, :update, :destroy ]
This will allow you get the state that you're looking for...
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