Question

我试图运行简单的迁移，但是我收到了这个错误。我认为这是一种兼容性错误。我该如何解决它，如何在将来避免兼容性问题？

Migration: `class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :nume
      t.string :email
      t.string :localitate

      t.timestamps 
    end
  end
end
___________________

的Gemfile

source 'https://rubygems.org'


# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.2.0.beta4'
# Use sqlite3 as the database for Active Record
gem 'sqlite3'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0.0.beta1'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.1.0'
# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jQuery as the JavaScript library
gem 'jquery-rails', '~> 4.0.0.beta2'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0', group: :doc

# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Unicorn as the app server
# gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug'

  # Access an IRB console on exception pages or by using <%= console %> in views
  gem 'web-console', '~> 2.0.0.beta4'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :jruby]

___________

错误：

错误的参数数量（1表示0）C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0 0.0 /宝石/了activerecord-4.2.0.beta4 / LIB / active_record / connection_adapters / abstract_ adapter.rb：271：initialize' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/connection_adapters/abstract_adapter.rb:271:in新＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / connection_adapters / abstract_adapter.rb：271：在substitute_at' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/relation.rb:97:in块中的substitute_values＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / relation.rb：96：在each' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/relation.rb:96:in each_with_index＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / relation.rb:96:in substitute_values' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/relation.rb:56:in insert＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / persistence.rb：521：在_create_record' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/counter_cache.rb:139:in _ create_record＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / attribute_methods / dirty.rb：122：在_create_record中的_create_record' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/callbacks.rb:306:in块中＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-4.2.0.beta4/l ib / active_support / callbacks.rb:88:in call' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-4.2.0.beta4/l ib/active_support/callbacks.rb:88:in _ run_callbacks＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-4.2.0.beta4/l ib / active_support / callbacks.rb：734：在_run_create_callbacks' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/callbacks.rb:306:in _ create_record＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / timestamp.rb：57：在_create_record' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/persistence.rb:501:in create_or_update＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / callbacks.rb：302：block in create_or_update' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-4.2.0.beta4/l ib/active_support/callbacks.rb:88:in来电＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-4.2.0.beta4/l ib / active_support / callbacks.rb:88:in _run_callbacks' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-4.2.0.beta4/l ib/active_support/callbacks.rb:734:in _ run_save_callbacks＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / callbacks.rb：302：在create_or_update' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/persistence.rb:142:in保存！＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / validations.rb:42:in save!' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/attribute_methods/dirty.rb:29:in保存！＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / transactions.rb：289：在with_transaction_returning_stat的block in save!' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/transactions.rb:345:in块中我们＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / connection_adapters / abstract / database_statements.rb：211：在tran saction' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/transactions.rb:218:in交易＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / transactions.rb：342：在with_transaction_returning_status' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/transactions.rb:289:in保存！＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / persistence.rb:51:in create!' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/migration.rb:1015:in record_version_state_after_migrating＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / migration.rb：985：在ddl_transaction＆＃39;中的block in execute_migration_in_transaction' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/migration.rb:1030:in块中 C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / connection_adapters / abstract / database_statements.rb：213：in bloc k in transaction' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/connection_adapters/abstract/transaction.rb:188:in within_new_t ransaction＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / connection_adapters / abstract / database_statements.rb：213：在tran saction' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/transactions.rb:218:in交易＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / migration.rb：1030：在ddl_transaction' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/migration.rb:983:in execute_migration_in_transaction＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / migration.rb：945：block in migrate' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/migration.rb:941:in每个＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / migration.rb：941：在migrate' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/migration.rb:813:in向上＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / migration.rb：791：在migrate' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b/active_record/tasks/database_tasks.rb:137:in中迁移＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.2.0.beta4/li b / active_record / railties / databases.rake：44：在block (2 levels) in <top (require d)>' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/lib/rake/task.r b:240:in来电＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/lib/rake/task.r b：240：block in execute' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/lib/rake/task.r b:235:in每个＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/lib/rake/task.r b：235：在execute' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/lib/rake/task.r b:179:in块中的invoke_with_call_chain＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/monitor.rb:211：在mon_synchronize' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/lib/rake/task.r b:172:in invoke_with_call_chain＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/lib/rake/task.r b：165：在invoke' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/lib/rake/applic ation.rb:156:in invoke_task＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/lib/rake/applic ation.rb：112：block (2 levels) in top_level' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/lib/rake/applic ation.rb:112:in每个＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/lib/rake/applic ation.rb：112：在block in top_level' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/lib/rake/applic ation.rb:121:in run_with_threads＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/lib/rake/applic ation.rb：106：在top_level' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/lib/rake/applic ation.rb:84:in块中运行＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/lib/rake/applic ation.rb：182：在standard_exception_handling' C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/lib/rake/applic ation.rb:79:in运行＆＃39; C：/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rake-10.4.0/bin/rake：33：在 <top (required)>' C:/RailsInstaller/Ruby2.0.0/bin/rake:23:in负载＆＃39; C：/RailsInstaller/Ruby2.0.0/bin/rake:23：在`＆＃39; 任务：TOP =＆gt;分贝：迁移

Answer 1

答案在这里：Can't migrate database after scaffold. Section 2.2 Ruby on Rails Tutorial Michael Hartl

您需要安装那里指定的arel gem。

兼容性问题？ rake db：migrate - 参数个数错误（0表示0）

1 个答案: