Dir.foreach("#{Rails.root.to_s}/app/models") do |model_path|
  next unless model_path.match(/.rb$/)
  model_class = model_path.gsub(/.rb$/, '').classify.constantize
  puts model_class
end

这将为您提供项目上的所有模型类。

def load_models_in_development
  if Rails.env == "development"
    load_models_for(Rails.root)
    Rails.application.railties.engines.each do |r|
      load_models_for(r.root)
    end
  end
end

def load_models_for(root)
  Dir.glob("#{root}/app/models/**/*.rb") do |model_path|
    begin
      require model_path
    rescue
      # ignore
    end
  end
end

就一句话:

 ActiveRecord::Base.subclasses.map(&:name)

在Rails 6中，Zetiwerk成为默认的代码加载器。

对于快速加载，请尝试:

Zeitwerk::Loader.eager_load_all

Then

ApplicationRecord.descendants

ActiveRecord::Base.connection.tables.map do |model|
  model.capitalize.singularize.camelize
end

将返回

["Article", "MenuItem", "Post", "ZebraStripePerson"]

附加信息如果你想在对象名上调用一个没有model:string未知方法或变量错误的方法，使用这个

model.classify.constantize.attribute_names

这适用于Rails 3.2.18

Rails.application.eager_load!

def all_models
  models = Dir["#{Rails.root}/app/models/**/*.rb"].map do |m|
    m.chomp('.rb').camelize.split("::").last
  end
end