ruby-on-rails - 可以通过命令行运行 Mongoid 查询吗？

Question

我正在使用 MongoDB 和 Mongoid 的 Rails 应用程序中工作。我可以使用 mongo shell 环境运行 mongo 查询，但我很想在 irb 中使用 Mongoid。那是我能做的吗？如果是这样，有人可以告诉我怎么做吗？

谢谢 ：）

Answer 1

As mentioned by Semyon the easiest option is to use:

$ rails console

If you want to do it manually, run up irb and prepend it with the environment you want (which is most likely development).

e.g./

$ RACK_ENV=development irb

Then require the mongoid gem & load your mongoid config & you should be able to use Mongoid. You'll also need to require any models you wish to use.

e.g/

> require 'mongoid'

> Mongoid.load!("path/to/your/mongoid.yml")

BTW. I'd recommend using pry rather than irb, it's like irb but you can find things out without leaving your terminal amongst other things.

e.g./

running

> ls Mongoid

shows me all the possible constants, Class & Instance Methods for Mongoid

constants: Atomic  Attributes  Callbacks  Collection  Collections  Components  Config  Contexts  Copyable  Criteria  Criterion  Cursor  DefaultScope  Dirty  Document  Errors  Extensions  Extras  Factory  Fields  Finders  Hierarchy  Identity  IdentityMap  Indexes  Inspection  Javascript  JSON  Keys  Logger  Matchers  MONGODB_VERSION  MultiDatabase  MultiParameterAttributes  NamedScope  NestedAttributes  Observer  Paranoia  Persistence  Relations  Reloading  Safety  Scope  Serialization  Sharding  State  Threaded  Timestamps  Validations  VERSION  Versioning
Mongoid#methods: add_language  add_observer  allow_dynamic_fields  allow_dynamic_fields=  allow_dynamic_fields?  autocreate_indexes  autocreate_indexes=  autocreate_indexes?  blacklisted_options  config  configure  count_observers  database  database=  databases  databases=  default_logger  destructive_fields  from_hash  identity_map_enabled  identity_map_enabled=  identity_map_enabled?  include_root_in_json  include_root_in_json=  include_root_in_json?  include_type_for_serialization  include_type_for_serialization=  include_type_for_serialization?  instantiate_observers  load!  logger  logger=  master  master=  max_retries_on_connection_failure  max_retries_on_connection_failure=  max_retries_on_connection_failure?  notify_observers  observer_instances  observers  observers=  parameterize_keys  parameterize_keys=  parameterize_keys?  persist_in_safe_mode  persist_in_safe_mode=  persist_in_safe_mode?  preload_models  preload_models=  preload_models?  purge!  raise_not_found_error  raise_not_found_error=  raise_not_found_error?  reconnect!  scope_overwrite_exception  scope_overwrite_exception=  scope_overwrite_exception?  skip_version_check  skip_version_check=  skip_version_check?  time_zone  time_zone=  time_zone?  unit_of_work  use_activesupport_time_zone  use_activesupport_time_zone=  use_activesupport_time_zone?  use_utc  use_utc=  use_utc?
Mongoid#methods: add_language  add_observer  allow_dynamic_fields  allow_dynamic_fields=  allow_dynamic_fields?  autocreate_indexes  autocreate_indexes=  autocreate_indexes?  blacklisted_options  config  configure  count_observers  database  database=  databases  databases=  default_logger  destructive_fields  from_hash  identity_map_enabled  identity_map_enabled=  identity_map_enabled?  include_root_in_json  include_root_in_json=  include_root_in_json?  include_type_for_serialization  include_type_for_serialization=  include_type_for_serialization?  instantiate_observers  load!  logger  logger=  master  master=  max_retries_on_connection_failure  max_retries_on_connection_failure=  max_retries_on_connection_failure?  notify_observers  observer_instances  observers  observers=  parameterize_keys  parameterize_keys=  parameterize_keys?  persist_in_safe_mode  persist_in_safe_mode=  persist_in_safe_mode?  preload_models  preload_models=  preload_models?  purge!  raise_not_found_error  raise_not_found_error=  raise_not_found_error?  reconnect!  scope_overwrite_exception  scope_overwrite_exception=  scope_overwrite_exception?  skip_version_check  skip_version_check=  skip_version_check?  time_zone  time_zone=  time_zone?  unit_of_work  use_activesupport_time_zone  use_activesupport_time_zone=  use_activesupport_time_zone?  use_utc  use_utc=  use_utc?

Answer 2

您还可以在项目中启动预配置的 Rails 控制台：

$ rails console
>> MyDocument.where(:foo => 'bar').to_a
=> [...]

Answer 3

在 Rails 控制台中

db = Mongoid::Clients.default

collection = db[:collection_name]

现在我们可以对集合执行查询。

要查看所有可能的方法，请使用

collection.methods.sort!