我正在使用 Heroku + Ruby 2.0.0p247、Rails 4.0.0、Mongoid4.0.0、MongoHQ 插件
我做了什么：
使用没有 activeRecords 的最新 rails 和 ruby 创建了新项目，安装了 gems mongoid 和 bson_ext，为 mongoid 创建了配置文件：
development:
sessions:
default:
database: siemens_development
hosts:
- localhost:27017
options:
options:
production:
sessions:
default:
uri: <%= ENV['MONGOHQ_URL'] %>
options:
skip_version_check: true
safe: true
，创建了新模型：
class Phone
include Mongoid::Document
field :name, type: String
field :photo, type: String
end
.
现在，当我尝试做类似的事情时（在控制台或控制器中）：
phones = Phone.all
phones.each do |phone|
p phone.name
end
，我收到此错误：
RuntimeError: No database set for session. Call #use or #with before accessing the database
from /app/vendor/bundle/ruby/2.0.0/gems/moped-2.0.0.beta2/lib/moped/session.rb:410:in `current_database'
from /app/vendor/bundle/ruby/2.0.0/gems/moped-2.0.0.beta2/lib/moped/session.rb:50:in `[]'
from /app/vendor/bundle/ruby/2.0.0/bundler/gems/mongoid-cc7a0e709066/lib/mongoid/sessions.rb:121:in `collection'
from /app/vendor/bundle/ruby/2.0.0/bundler/gems/mongoid-cc7a0e709066/lib/mongoid/sessions/options.rb:157:in `method_missing'
from /app/vendor/bundle/ruby/2.0.0/bundler/gems/mongoid-cc7a0e709066/lib/mongoid/contextual/mongo.rb:265:in `initialize'
from /app/vendor/bundle/ruby/2.0.0/bundler/gems/mongoid-cc7a0e709066/lib/mongoid/contextual.rb:51:in `new'
from /app/vendor/bundle/ruby/2.0.0/bundler/gems/mongoid-cc7a0e709066/lib/mongoid/contextual.rb:51:in `create_context'
from /app/vendor/bundle/ruby/2.0.0/bundler/gems/mongoid-cc7a0e709066/lib/mongoid/contextual.rb:34:in `context'
from /app/vendor/bundle/ruby/2.0.0/bundler/gems/mongoid-cc7a0e709066/lib/mongoid/contextual.rb:18:in `each'
from (irb):5
from /app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/commands/console.rb:90:in `start'
from /app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/commands/console.rb:9:in `start'
from /app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/commands.rb:64:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
不知道如何修复它，整天用谷歌搜索，没有结果:(
在我的 Gemfile 中：
gem 'rails', '4.0.0'
gem 'mongoid', git: 'https://github.com/mongoid/mongoid.git'
gem "bson_ext"
我没有尝试在 localhost 上启动它，因为我没有安装 mongoDB。
新的信息！启动后：
ph = Phone.new(name:'qwe',photo:'qweqw')
ph.save
我收到错误：
Moped::Errors::OperationFailure: The operation: #<Moped::Protocol::Command
@length=64
@request_id=5
@response_to=0
@op_code=2004
@flags=[]
@full_collection_name=".$cmd"
@skip=0
@limit=-1
@selector={:getlasterror=>1, :w=>1}
@fields=nil>
failed with error 16256: "Invalid ns [.$cmd]"
See https://github.com/mongodb/mongo/blob/master/docs/errors.md
for details about this error.
from /app/vendor/bundle/ruby/2.0.0/gems/moped-2.0.0.beta2/lib/moped/operation/read.rb:54:in `block in execute'
from /app/vendor/bundle/ruby/2.0.0/gems/moped-2.0.0.beta2/lib/moped/node.rb:584:in `[]'
from /app/vendor/bundle/ruby/2.0.0/gems/moped-2.0.0.beta2/lib/moped/node.rb:584:in `block (3 levels) in flush'
from /app/vendor/bundle/ruby/2.0.0/gems/moped-2.0.0.beta2/lib/moped/node.rb:583:in `map'
from /app/vendor/bundle/ruby/2.0.0/gems/moped-2.0.0.beta2/lib/moped/node.rb:583:in `block (2 levels) in flush'
from /app/vendor/bundle/ruby/2.0.0/gems/moped-2.0.0.beta2/lib/moped/node.rb:192:in `block in ensure_connected'
from /app/vendor/bundle/ruby/2.0.0/gems/moped-2.0.0.beta2/lib/moped/executable.rb:25:in `execute'
from /app/vendor/bundle/ruby/2.0.0/gems/moped-2.0.0.beta2/lib/moped/node.rb:189:in `ensure_connected'
from /app/vendor/bundle/ruby/2.0.0/gems/moped-2.0.0.beta2/lib/moped/node.rb:577:in `block in flush'
from /app/vendor/bundle/ruby/2.0.0/gems/moped-2.0.0.beta2/lib/moped/node.rb:608:in `block in logging'
from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0/lib/active_support/notifications.rb:159:in `block in instrument'
from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0/lib/active_support/notifications.rb:159:in `instrument'
from /app/vendor/bundle/ruby/2.0.0/gems/moped-2.0.0.beta2/lib/moped/instrumentable.rb:31:in `instrument'
from /app/vendor/bundle/ruby/2.0.0/gems/moped-2.0.0.beta2/lib/moped/node.rb:607:in `logging'
from /app/vendor/bundle/ruby/2.0.0/gems/moped-2.0.0.beta2/lib/moped/node.rb:576:in `flush'
... 14 levels...
from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0/lib/active_support/callbacks.rb:373:in `_run__1088715116367060670__create__callbacks'
from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0/lib/active_support/callbacks.rb:80:in `run_callbacks'
from /app/vendor/bundle/ruby/2.0.0/bundler/gems/mongoid-cc7a0e709066/lib/mongoid/interceptable.rb:132:in `run_callbacks'
from /app/vendor/bundle/ruby/2.0.0/bundler/gems/mongoid-cc7a0e709066/lib/mongoid/persistable/creatable.rb:117:in `block in prepare_insert'
from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0/lib/active_support/callbacks.rb:373:in `_run__1088715116367060670__save__callbacks'
from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0/lib/active_support/callbacks.rb:80:in `run_callbacks'
from /app/vendor/bundle/ruby/2.0.0/bundler/gems/mongoid-cc7a0e709066/lib/mongoid/interceptable.rb:132:in `run_callbacks'
from /app/vendor/bundle/ruby/2.0.0/bundler/gems/mongoid-cc7a0e709066/lib/mongoid/persistable/creatable.rb:116:in `prepare_insert'
from /app/vendor/bundle/ruby/2.0.0/bundler/gems/mongoid-cc7a0e709066/lib/mongoid/persistable/creatable.rb:23:in `insert'
from /app/vendor/bundle/ruby/2.0.0/bundler/gems/mongoid-cc7a0e709066/lib/mongoid/persistable/savable.rb:23:in `save'
from (irb):18
from /app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/commands/console.rb:90:in `start'
from /app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/commands/console.rb:9:in `start'
from /app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/commands.rb:64:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'