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Diffstat (limited to 'guides/source/debugging_rails_applications.md')
| -rw-r--r-- | guides/source/debugging_rails_applications.md | 63 |
1 files changed, 31 insertions, 32 deletions
diff --git a/guides/source/debugging_rails_applications.md b/guides/source/debugging_rails_applications.md index ba0cdbf3af..88d205e1ab 100644 --- a/guides/source/debugging_rails_applications.md +++ b/guides/source/debugging_rails_applications.md @@ -1,4 +1,4 @@ -**DO NOT READ THIS FILE ON GITHUB, GUIDES ARE PUBLISHED ON http://guides.rubyonrails.org.** +**DO NOT READ THIS FILE ON GITHUB, GUIDES ARE PUBLISHED ON https://guides.rubyonrails.org.** Debugging Rails Applications ============================ @@ -147,7 +147,7 @@ TIP: The default Rails log level is `debug` in all environments. ### Sending Messages -To write in the current log use the `logger.(debug|info|warn|error|fatal)` method from within a controller, model or mailer: +To write in the current log use the `logger.(debug|info|warn|error|fatal)` method from within a controller, model, or mailer: ```ruby logger.debug "Person attributes hash: #{@person.attributes.inspect}" @@ -162,41 +162,41 @@ class ArticlesController < ApplicationController # ... def create - @article = Article.new(params[:article]) + @article = Article.new(article_params) logger.debug "New article: #{@article.attributes.inspect}" logger.debug "Article should be valid: #{@article.valid?}" if @article.save - flash[:notice] = 'Article was successfully created.' logger.debug "The article was saved and now the user is going to be redirected..." - redirect_to(@article) + redirect_to @article, notice: 'Article was successfully created.' else - render action: "new" + render :new end end # ... + + private + def article_params + params.require(:article).permit(:title, :body, :published) + end end ``` Here's an example of the log generated when this controller action is executed: ``` -Processing ArticlesController#create (for 127.0.0.1 at 2008-09-08 11:52:54) [POST] - Session ID: BAh7BzoMY3NyZl9pZCIlMDY5MWU1M2I1ZDRjODBlMzkyMWI1OTg2NWQyNzViZjYiCmZsYXNoSUM6J0FjdGl -vbkNvbnRyb2xsZXI6OkZsYXNoOjpGbGFzaEhhc2h7AAY6CkB1c2VkewA=--b18cd92fba90eacf8137e5f6b3b06c4d724596a4 - Parameters: {"commit"=>"Create", "article"=>{"title"=>"Debugging Rails", - "body"=>"I'm learning how to print in logs!!!", "published"=>"0"}, - "authenticity_token"=>"2059c1286e93402e389127b1153204e0d1e275dd", "action"=>"create", "controller"=>"articles"} -New article: {"updated_at"=>nil, "title"=>"Debugging Rails", "body"=>"I'm learning how to print in logs!!!", - "published"=>false, "created_at"=>nil} +Started POST "/articles" for 127.0.0.1 at 2017-08-20 20:53:10 +0900 +Processing by ArticlesController#create as HTML + Parameters: {"utf8"=>"✓", "authenticity_token"=>"xhuIbSBFytHCE1agHgvrlKnSVIOGD6jltW2tO+P6a/ACjQ3igjpV4OdbsZjIhC98QizWH9YdKokrqxBCJrtoqQ==", "article"=>{"title"=>"Debugging Rails", "body"=>"I'm learning how to print in logs!!!", "published"=>"0"}, "commit"=>"Create Article"} +New article: {"id"=>nil, "title"=>"Debugging Rails", "body"=>"I'm learning how to print in logs!!!", "published"=>false, "created_at"=>nil, "updated_at"=>nil} Article should be valid: true - Article Create (0.000443) INSERT INTO "articles" ("updated_at", "title", "body", "published", - "created_at") VALUES('2008-09-08 14:52:54', 'Debugging Rails', - 'I''m learning how to print in logs!!!', 'f', '2008-09-08 14:52:54') + (0.1ms) BEGIN + SQL (0.4ms) INSERT INTO "articles" ("title", "body", "published", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5) RETURNING "id" [["title", "Debugging Rails"], ["body", "I'm learning how to print in logs!!!"], ["published", "f"], ["created_at", "2017-08-20 11:53:10.010435"], ["updated_at", "2017-08-20 11:53:10.010435"]] + (0.3ms) COMMIT The article was saved and now the user is going to be redirected... -Redirected to # Article:0x20af760> -Completed in 0.01224 (81 reqs/sec) | DB: 0.00044 (3%) | 302 Found [http://localhost/articles] +Redirected to http://localhost:3000/articles/1 +Completed 302 Found in 4ms (ActiveRecord: 0.8ms) ``` Adding extra logging like this makes it easy to search for unexpected 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. @@ -313,7 +313,7 @@ For example: ```bash => Booting Puma -=> Rails 5.0.0 application starting in development on http://0.0.0.0:3000 +=> Rails 5.1.0 application starting in development on http://0.0.0.0:3000 => Run `rails server -h` for more startup options Puma starting in single mode... * Version 3.4.0 (ruby 2.3.1-p112), codename: Owl Bowl Brawl @@ -401,7 +401,7 @@ To see the previous ten lines you should type `list-` (or `l-`). 7 byebug 8 @articles = Article.find_recent 9 - 10 respond_to do |format| + 10 respond_to do |format| ``` This way you can move inside the file and see the code above the line where you @@ -445,11 +445,11 @@ then `backtrace` will supply the answer. --> #0 ArticlesController.index at /PathToProject/app/controllers/articles_controller.rb:8 #1 ActionController::BasicImplicitRender.send_action(method#String, *args#Array) - at /PathToGems/actionpack-5.0.0/lib/action_controller/metal/basic_implicit_render.rb:4 + at /PathToGems/actionpack-5.1.0/lib/action_controller/metal/basic_implicit_render.rb:4 #2 AbstractController::Base.process_action(action#NilClass, *args#Array) - at /PathToGems/actionpack-5.0.0/lib/abstract_controller/base.rb:181 + at /PathToGems/actionpack-5.1.0/lib/abstract_controller/base.rb:181 #3 ActionController::Rendering.process_action(action, *args) - at /PathToGems/actionpack-5.0.0/lib/action_controller/metal/rendering.rb:30 + at /PathToGems/actionpack-5.1.0/lib/action_controller/metal/rendering.rb:30 ... ``` @@ -461,7 +461,7 @@ context. ``` (byebug) frame 2 -[176, 185] in /PathToGems/actionpack-5.0.0/lib/abstract_controller/base.rb +[176, 185] in /PathToGems/actionpack-5.1.0/lib/abstract_controller/base.rb 176: # is the intended way to override action dispatching. 177: # 178: # Notice that the first argument is the method to be dispatched @@ -485,7 +485,7 @@ stack frames. ### Threads -The debugger can list, stop, resume and switch between running threads by using +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: @@ -540,8 +540,8 @@ command later in this guide). 7 byebug 8 @articles = Article.find_recent 9 -=> 10 respond_to do |format| - 11 format.html # index.html.erb +=> 10 respond_to do |format| + 11 format.html # index.html.erb 12 format.json { render json: @articles } 13 end 14 end @@ -606,7 +606,6 @@ You can also inspect for an object method this way: @new_record = true @readonly = false @transaction_state = nil -@txn = nil ``` You can also use `display` to start watching variables. This is a good way of @@ -677,7 +676,7 @@ Ruby instruction to be executed -- in this case, Active Support's `week` method. ``` (byebug) step -[49, 58] in /PathToGems/activesupport-5.0.0/lib/active_support/core_ext/numeric/time.rb +[49, 58] in /PathToGems/activesupport-5.1.0/lib/active_support/core_ext/numeric/time.rb 49: 50: # Returns a Duration instance matching the number of weeks provided. 51: # @@ -778,7 +777,7 @@ deleted when that breakpoint is reached. * `finish [n]`: execute until the selected stack frame returns. If no frame number is given, the application will run until the currently selected frame returns. The currently selected frame starts out the most-recent frame or 0 if -no frame positioning (e.g up, down or frame) has been performed. If a frame +no frame positioning (e.g up, down, or frame) has been performed. If a frame number is given it will run until the specified frame returns. ### Editing @@ -876,7 +875,7 @@ location of the `console` call; it won't be rendered on the spot of its invocation but next to your HTML content. The console executes pure Ruby code: You can define and instantiate -custom classes, create new models and inspect variables. +custom classes, create new models, and inspect variables. NOTE: Only one console can be rendered per request. Otherwise `web-console` will raise an error on the second `console` invocation. |