Tabellen und Probleme mit der Primärschlüssel in Rails Erstellen

Question

Wenn ich versuche, den folgenden Code in Rails mit mysql2 als Datenbank-Manager ausgeführt werden:

rake db:migrate 

I erhalten folgende Fehlermeldung:

rake aborted! 
"Mysql2::Error: All parts of a PRIMARY KEY must be NOT NULL:" 

Warum tun Ich erhalte diesen Fehler, wenn der Primärschlüssel in einer Tabelle standardmäßig NICHT "null" ist?

Migration Code jedoch:

class CreateUsers < ActiveRecord::Migration 
    def change 
    create_table :users do |t| 
    t.string "first_name" 
    t.timestamps 
    end 
    end 
end 

Answer 1

aus der MySQL-5.7 brechen ändern Seite:

Columns in a PRIMARY KEY must be NOT NULL, but if declared explicitly as NULL produced no error. Now an error occurs. For example, a statement such as CREATE TABLE t (i INT NULL PRIMARY KEY) is rejected. The same occurs for similar ALTER TABLE statements. (Bug #13995622, Bug #66987, Bug #15967545, Bug #16545198)

Changes in MySQL 5.7.3 (2013-12-03, Milestone 13)

Dieses Problem was fixed vor 3 Monaten. Ich weiß nicht, was Rails-Version es geht ist here

EDIT Teil

Affe Patch sein: Es ist schon mehr als ein Jahr, dass dieses Update in Master verschmolzen wurde. Also muss es Teil der letzten Version von Rails sein.

EDIT: Tat der Commit, dass behebt diese zu finden unter: https://github.com/yahonda/rails/commit/b6655885ef13cf8d1705dc9b5232846f0207febd, und zeigt, dass das Update in v4.2.0.beta1, v4.1.6.rc1, v4.1.5, v4.1.4, v4.1.3, v4.1.2, v4.1.2.rc3, v4.1.2.rc2, v4.1.2.rc1, v4.1.1, v4.1.0, v4.1.0.rc2, v4.1.0.rc1, v4.1.0.beta2, v4.1.0.beta1 enthalten ist. Wenn eine Aktualisierung auf mindestens v4.1.0 eine Option für Sie ist, sollte das Problem behoben sein.

Answer 2

hatte ich ein gleiches Problem vor, und ich löste nach hier https://github.com/rails/rails/pull/13247#issuecomment-32425844

With Rails 2.3.5, MySQL version 5.7.9 and mysql gem you need to have this bit as an initializer in config/initializers/abstract_mysql_adapter.rb:

class ActiveRecord::ConnectionAdapters::MysqlAdapter 
    NATIVE_DATABASE_TYPES[:primary_key] = "int(11) auto_increment PRIMARY KEY" 
end 

For mysql2, it should be config/initializers/abstract_mysql2_adapter.rb:

class ActiveRecord::ConnectionAdapters::Mysql2Adapter 
    NATIVE_DATABASE_TYPES[:primary_key] = "int(11) auto_increment PRIMARY KEY" 
end 

Answer 3

ich dieses Problem hatte eine Rails 4.0.x App mysql 5.7.x. läuft Ich konnte es beheben, indem ich auf Schienen 4.2.x aufrüstete und meine Edelsteine ​​aufwertete.

(Ich bin sicher, dass diese gemfiles Arbeit benötigen, aber hoffentlich sind sie immer noch nützlich)

Old Gemfile

source 'https://rubygems.org' 
ruby '2.0.0' 

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails' 
gem 'rails', '4.0.13' 
gem 'mysql2' 
# Use unicorn as the app server 
# gem 'unicorn' 

gem 'sidekiq' 
gem 'sinatra' 
gem 'whenever' 

gem 'thin' 
gem 'faye' 
gem 'faye-websocket' 

#pdf generation 
gem 'wicked_pdf' 
gem 'wkhtmltopdf-binary' 

# Assets 
gem 'backbone-on-rails', '~> 0.9.9' 
gem 'coffee-rails', '~> 4.0.1' 
gem 'coffee-script-source', '=1.8.0' 
gem 'ejs'         # uses templates for backbone 
gem 'jquery-rails' 
gem 'jquery-ui-rails' 
gem 'neat' 
gem 'sass-rails', '~> 4.0.3' 
gem 'therubyracer' 
gem 'turbolinks' 
gem 'uglifier', '>= 1.3.0' 

gem 'active_model_serializers', '0.8.3' 
gem 'acts_as_list' 
gem 'bcrypt-ruby', '~> 3.1.2' 
gem 'bootstrap-sass', '~> 3.2.0.0' 
gem 'bower-rails' 
gem 'carrierwave' 
gem 'enumerize' 
gem 'embedly'       # Url to Attachment Processing 
gem 'fancybox2-rails', '~> 0.2.4' 
gem 'flamegraph' 
gem 'fog'      # s3 storage 
gem 'globalize' # I18n for tagging, etc. 
gem 'globalize-accessors' 
gem 'i18n-tasks', '~> 0.8.3' 
gem 'hirb' 
gem 'kaminari' 
gem 'nokogiri' 
gem 'newrelic_rpm' 
gem 'select2-rails'     # Token Fields 
gem 'twilio-ruby' 
gem 'rails_autolink'     # Convert urls to links 
gem 'redis', '3.2.1' 
gem 'rest-client' 
gem 'rmagick' 
gem 'rubyzip', :require => 'zip'  # Zip files together 
gem 'unf' 
gem 'mailgun-ruby', '~>1.0.3', require: 'mailgun' 

# Deployments 
gem 'mina' 

group :doc do 
    gem 'sdoc' 
end 

group :test do 
    gem 'rspec-rails', "= 2.14.2" 
    gem 'shoulda-matchers', :require => false 
    gem 'simplecov', '~> 0.9.2' 
    gem 'database_cleaner' 
    gem 'codeclimate-test-reporter', require: nil 
end 

group :development, :test do 
    gem 'quiet_assets' 
    gem 'factory_girl_rails', "~> 4.0" 
    gem 'guard', '>=2.1.0' 
    gem 'guard-rspec', '= 4.2.9' 
    gem 'spring', '1.3.6' 
    gem 'spring-commands-rspec' 
    gem 'foreman' 
end 

New Gemfile

source 'https://rubygems.org' 
ruby '2.3.0' 

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails' 
gem 'rails', '4.2.5' 
gem 'mysql2' 
gem 'stackprof' 
# Use unicorn as the app server 
# gem 'unicorn' 

gem 'sidekiq' 
gem 'sinatra' 
gem 'whenever' 

gem 'thin' 
gem 'faye' 
gem 'faye-websocket' 

#pdf generation 
gem 'wicked_pdf' 
gem 'wkhtmltopdf-binary' 

# Assets 
gem 'backbone-on-rails', '~> 0.9.9' 
gem 'coffee-rails', '~> 4.0.1' 
gem 'coffee-script-source', '=1.8.0' 
gem 'ejs'         # uses templates for backbone 
gem 'jquery-rails' 
gem 'jquery-ui-rails' 
gem 'neat' 
gem 'sass-rails', '~> 4.0.3' 
gem 'therubyracer' 
gem 'turbolinks' 
gem 'uglifier', '>= 1.3.0' 

gem 'active_model_serializers', '0.8.3' 
gem 'acts_as_list' 
gem 'bcrypt', '~> 3.1.2' 
gem 'bootstrap-sass', '~> 3.2.0.0' 
gem 'bower-rails' 
gem 'carrierwave' 
gem 'enumerize' 
gem 'embedly'       # Url to Attachment Processing 
gem 'fancybox2-rails', '~> 0.2.4' 
gem 'flamegraph' 
gem 'fog'      # s3 storage 
gem 'globalize' # I18n for tagging, etc. 
gem 'globalize-accessors' 
gem 'i18n-tasks', '~> 0.8.3' 
gem 'hirb' 
gem 'kaminari' 
gem 'nokogiri' 
gem 'newrelic_rpm' 
gem 'select2-rails'     # Token Fields 
gem 'twilio-ruby' 
gem 'rails_autolink'     # Convert urls to links 
gem 'redis', '3.2.1' 
gem 'rest-client' 
gem 'rmagick' 
gem 'rubyzip', :require => 'zip'  # Zip files together 
gem 'unf' 
gem 'mailgun-ruby', '~>1.0.3', require: 'mailgun' 
gem 'rack-cors', :require => 'rack/cors' 

# Deployments 
gem 'mina' 

group :doc do 
    gem 'sdoc' 
end 

group :test do 
    gem 'rspec-rails', "= 2.14.2" 
    gem 'shoulda-matchers', :require => false 
    gem 'simplecov', '~> 0.9.2' 
    gem 'database_cleaner' 
    gem 'codeclimate-test-reporter', require: nil 
end 

group :development, :test do 
    gem 'quiet_assets' 
    gem 'factory_girl_rails', "~> 4.0" 
    gem 'guard', '>=2.1.0' 
    gem 'guard-rspec', '= 4.2.9' 
    gem 'spring', '1.6.1' 
    gem 'spring-commands-rspec' 
    gem 'foreman' 
end