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Mongoid v2.2.0 Release Notes

  • 🆕 New Features

    • Mongoid now contains eager loading in the form of Criteria#includes(*args). This works on has_one, has_many, belongs_to associations and requires the identity map to be enabled in order to function. Set identity_map_enabled: true in your mongoid.yml. Ex: Person.where(title: "Sir").includes(:posts, :game)

    • Relations can now take a module as a value to the :extend option. (Roman Shterenzon)

    • Capped collections can be created by passing the options to the #store_in macro: Person.store_in :people, capped: true, max: 1000000

    • Mongoid::Collection now supports collection.find_and_modify

    • Document#has_attribute? now aliases to Document#attribute_present?

    • #930 You can now turn off the Mongoid logger via the mongoid.yml by doing logger: false

    • 👻 #909 We now raise a Mongoid::Errors::Callback exception if persisting with a bang method and a callback returns false, instead of the uninformative validations error from before.

    Major Changes

    • #1173 has_many relations no longer delete all documents on a set of the relation (= [ doc_one, doc_two ]) but look to the dependent option to determine what behavior should occur. :delete and :destroy will behave as before, :nullify and no option specified will both nullify the old documents without deleting.

    • #1142, #767 Embedded relations no longer immediately persist atomically when accessed via a parent attributes set. This includes nested attributes setting and attributes= or write_attributes. The child changes then remain dirty and ⚡️ atomically update when save is called on them or the parent document.

    Resolved Issues

    • 🛠 #1190 Fixed the gemspec errors due to changing README and CHANGELOG to markdown.

    • #1180, #1084, #955 Mongoid now checks the field types rather than if the name contains /id/ when trying to convert to object ids on criteria.

    • #1176 Enumerable targets should always return the in memory documents first, when calling #first

    • 🔀 #1175 Make sure both sides of many to many relations are in sync during a create.

    • #1172 Referenced enumerable relations now properly handle #to_json (Daniel Doubrovkine)

    • 🐎 #1040 Increased performance of class load times by removing all delegate calls to self.class.