Rails error records

Records for rails errors and solutions.

Error: Deploy processing fail and expose error below, but no detail log for where the error occur.

Error message: Uglifier::Error: Unexpected token: punc (,)

Solution: Go into ‘rails console’ mode, and run script below. Code position where error occur will show up.

JS_PATH = "app/assets/javascripts/**/*.js"; 
Dir[JS_PATH].each do |file_name|
  puts "\n#{file_name}"
  puts Uglifier.compile(File.read(file_name), harmony: true)
end

Error: Precompile assets when deploying to production.

Error message: Uglifier::Error: Unexpected token: punc ({). To use ES6 syntax, harmony mode must be enabled with Uglifier.new(:harmony => true).

Reason: ES6 syntax is use in normal js file.

Solution:

# environments/production.rb
# comment out this line
# config.assets.js_compressor = :uglifier
# add line below, enable harmony mode，allow to use ES6 syntax in normal js file
config.assets.js_compressor = Uglifier.new(harmony: true)

Error message: Capybara::NotSupportedByDriverError

Reason: This error is raise by RackTest, because some feature tests have not set “js:true”.

Error: Error message below show in some page.

Error message: An unhandled lowlevel error occurred. The application logs may have details.

Reason: Connection pool of mysql is used out.

Solution: The reason can be found in puma log. Path of puma log is config in config/puma.rb, and the default path is app_path/shared/log/puma.stderr.log. After review log in puma.stderr.log, some message show up: “could not obtain a database connection within 5.000 seconds (waited 5.000 seconds) (ActiveRecord::ConnectionTimeoutError)”. Now we know what happened. Increase pool number in “config/database.yml” will solve it.

Error: When execute “rails console”.

Error message: FATAL: Listen error: unable to monitor directories for changes.

Reason: x

Solution: x

**echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p**

Error: When using kaminari

Error message: undefined method “page”

Reason: Kaminari has been installed in engine that project include. But the main can not use it.

Solution: Install kaminari gem in main project.

Error: active_model_serializers return data with original structure, but not defined in xx_serializers.rb.

Reason: xSome thing wrong in connected attribute, such as has_one :xxx definded in xx_serializers.rb, but actually there is not has_one relation, or the relation is has_many.

Error: Execute “rails console”, and stuck for a long time, can’t go into console mode.

Reason: Stuck by spring.

Solution: Kill spring thread, and execute rails console again

Error: 执行joins查询时报错：ActiveRecord::ConfigurationError: Can’t join ‘Order’ to association named ‘sub_order’

Error message: x

Reason: x

Solution: xOrder.joins(:sub_order) 应该为 Order.joins(:sub_orders)才对，因为order has many sub_orders

Error: xProduction environment, there is Vue instance in the page, but after loaded, element of Vue disappeared.

Solution: In production environment, import command must like this.

import Vue from 'vue/dist/vue.esm'

Error: Execute “cap production depoly”.

Error message: cap aborted! Don’t know how to build task ‘depoly’ (see –tasks)

Solution: Must be deploy, not deploy.

Error: API request get 200 response, but no content.

Reason: Some exception occured in controller or model, but not be raised, or not rescued. Like xx_model.save. When it failed, nothing exception will be raised. If controller not check the save result and response directly, it will cause this issue.

Error message: ActionDispatch::Cookies::CookieOverflow

Reason: It always occur in dev environment. Some Frontend Dependent file are not existed, but webpack-server was not restarted.

Solution: Check the exist of these files, restart webpack-server.

Error message: Capfile locked at 3.1.0, but 3.2.1 is loaded

Solution: Uninstall newer version of capistrano

bundle uninstall capistrano

Error message: Webpacker can’t find xx.js in manifest.json

Solution: Delete public/packs/manifest.json, restart ./bin/webpack-web-serser

Error: xAJAX API request was redirect to login page. There is “Can’t verify CSRF token authenticity” in request log.

Reason: The request is block by protect_from_forgery.

Solution: api_request? must be defined to match all api request

# application_controller.rb
protect_from_forgery unless: -> {api_request?}

Error: xUsing add_timestamps to add timestamps(created_at, updated_at) to existed tables will get “not default value” error.

Reason: xcolumns add by add_timestamps are not allowed nil value.

Solution: xExecute add_timestamps with “null: true” to allow related columns to be nil, and then replenish these values. At last, set columns to “null: false”

add_timestamps :one_models, null: true

long_ago = DateTime.new(2000, 1, 1)

OneModel.update_all(created_at: long_ago, updated_at: long_ago)

change_column_null :one_models, :created_at, false

change_column_null :one_models, :updated_at, false