昨天和同事讨论这个问题才发现改了，谢谢

class Post < ApplicationRecord
  enum source: { original: 0, link: 1 }

  validates :post_link, presence: true, if: :link?
end

RubyMine 符号方式也可以跳

这个文档看过，还以为 proc 方式隐藏着什么魔法 。原来这样，看来是我想多了，谢谢

知道了，谢谢

关键是去掉.with_attached_attachment .with_attached_icon这两个方法之后就只渲染一次了

就是 DATABASE_URL 变量有值导致的。谢谢

是的，有值，谢谢

也试过了，我现在在重新用 rbenv 装 ruby 试一下，谢谢大佬

没用，重启系统都试了

# MySQL. Versions 5.5.8 and up are supported.
#
# Install the MySQL driver
#   gem install mysql2
#
# Ensure the MySQL gem is defined in your Gemfile
#   gem 'mysql2'
#
# And be sure to use new-style password hashing:
#   https://dev.mysql.com/doc/refman/5.7/en/password-hashing.html
#
default: &default
  adapter: mysql2
  encoding: utf8mb4
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: root
  password: root
  socket: /tmp/mysql.sock

development:
  <<: *default
  database: almond_development

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  <<: *default
  database: almond_test

# As with config/credentials.yml, you never want to store sensitive information,
# like your database password, in your source code. If your source code is
# ever seen by anyone, they now have access to your database.
#
# Instead, provide the password or a full connection URL as an environment
# variable when you boot the app. For example:
#
#   DATABASE_URL="mysql2://myuser:mypass@localhost/somedatabase"
#
# If the connection URL is provided in the special DATABASE_URL environment
# variable, Rails will automatically merge its configuration values on top of
# the values provided in this file. Alternatively, you can specify a connection
# URL environment variable explicitly:
#
#   production:
#     url: <%= ENV['MY_APP_DATABASE_URL'] %>
#
# Read https://guides.rubyonrails.org/configuring.html#configuring-a-database
# for a full overview on how database connection configuration can be specified.
#
production:
  <<: *default
  database: almond_production
  username: almond
  password: <%= ENV['ALMOND_DATABASE_PASSWORD'] %>

你没用 application.html.erb 这样的 layout 么？

参考一下这个Can't verify CSRF token authenticity rails

确实是这个问题 (引用了两个 *_ujs)。现在解决了。谢谢。

测试过好多次。都是一样的结果

谢谢