For instructions on upgrading to newer versions, visit mongoid.org.
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Mongoid now contains eager loading in the form of Criteria#includes(*args). This works on all relational associations and requires the identity map to be enabled in order to function. Set identity_map_enabled: true in your mongoid.yml
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Relations can now take a module as a value to the :extend option. (Roman Shterenzon)
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Capped collections can be created by passing the options to the .store_in macro: Person.store_in :people, capped: true, max: 1000000
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#1159 Fixed build blocks not to cancel out each other when nested.
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#1154 Don’t delete many-to-many documents on empty array set.
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#1153 Retain parent document reference in after callbacks.
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#1151 Fix associated validation infinite loop on self referencing documents.
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#1150 Validates associated on belongs_to is false by default.
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#1149 Fixed metadata setting on belongs to relations.
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#1145 Metadata inverse should return nil if inverse_of was set as nil.
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#1139 Enumerable targets now quack like arrays.
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#1136 Setting belongs_to parent to nil no longer deletes the parent.
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#1120 Don’t call in_memory on relations if they don’t respond to it.
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#1075 Set self in default procs to the document instance.
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#1072 Writing attributes for nested documents can take a hash or array of hashes.
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#990 Embedded documents can use a single embedded_in with multiple parent definitions.
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#1148 Fixed respond_to? on all relations to return properly.
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#1146 Added back the Mongoid destructive fields check when defining fields.
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#1141 Fixed conversions of nil values in criteria.
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#1131 Verified Mongoid/Kaminari paginating correctly.
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#1105 Fixed atomic update consumer to be scoped to class.
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#1075 self in default lambdas and procs now references the document instance.
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#740 Removed embedded_object_id configuration parameter.
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#661 Fixed metadata caching on embedded documents.
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#595 Fixed relation reload flagging.
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#410 Moving documents from one relation to another now works as expected.
This was a specific release to fix MRI 1.8.7 breakages introduced by 2.1.6.
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#1126 Fix setting of relations with other relation proxies.
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#1122 Hash and array fields now properly flag as dirty on access and change.
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#656 Fixed reload breaking relations on unsetting of already loaded associations.
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#647 Prefer #unset to #remove_attribute for removing values.
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#290 Verify pushes into deeply embedded documents.
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#1116 Embedded children retain reference to parent in destroy callbacks.
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#1110, #1115 Don’t memoize metadata related helpers on documents.
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#1112 db:create_indexes no longer indexes subclasses multiple times.
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#1111, #1098 Don’t set _id in $set operations.
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#1007 Update attribute properly tracks array changes.
This was a specific release to get a Psych generated gemspec so no more parse errors would occur on those rubies that were using the new YAML parser.
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#1109 Fixed validations not loading one to ones into memory.
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#1107 Mongoid no longer wants required mongoid/railtie in application.rb
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#1102 Fixed nested attributes deletion.
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#1097 Reload now runs after_initialize callbacks.
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#1079 Embeds many no longer duplicates documents.
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#1078 Fixed array criteria matching on embedded documents.
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#1028 Implement scoped on one-to-many and many-to-many relations.
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#988 Many-to-many clear no longer deletes the child documents.
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#977 Autosaving relations works also through nested attributes.
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#972 Recursive embedding now handles namespacing on generated names.
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#943 Don’t override Document#attributes.
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#893 Verify count is not caching on many to many relations.
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#815 Verify after_initialize is run in the correct place.
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#793 Verify any_of scopes chain properly with any other scope.
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#776 Fixed mongoid case quality when dealing with subclasses.
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#747 Fixed complex criteria using its keys to render its string value.
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#721 safely now properly raises validation errors when they occur.
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#1082 Alias size and length to count on criteria. (Adam Greene)
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#1044 When multiple relations are defined for the same class, always return the default inverse first if inverse_of is not defined.
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#710 Nested attributes accept both id and _id in hashes or arrays.
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#1047 Ignore nil values passed to embeds_man pushes and substitution. (Derick Bailey)
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#1021, #719 Many to many relations dont trigger extra database queries when pushing new documents.
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#607 Calling create on large associations does not load the entire relation.
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#1064 Mongoid::Paranoia should respect unscoped and scoped.
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#1026 model#update_attribute now can update booleans to false.
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#618 Crack XML library breaks Mongoid by adding #attributes method to the String class. (Stephen McGinty)
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Mongoid now requires MongoDB 1.8.x in order to properly support the #bit and #rename atomic operations.
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Traditional slave support has been removed from Mongoid. Replica sets should be used in place of traditional master and slave setups.
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Custom field serialization has changed. Please see serializable for changes.
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The dirty attribute tracking has been switched to use ActiveModel, this brings many bug fixes and changes:
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#756 After callbacks and observers see what was changed instead of changes just made being in previous_changes
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#434 Documents now are flagged as dirty when brand new or the state on instantiation differs from the database state. This is consistent with ActiveRecord.
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#323 Mongoid now supports [field]_will_change! from ActiveModel::Dirty
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Mongoid model preloading in development mode now defaults to false.
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:autosave => true on relational associations now saves on update as well as create.
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Mongoid now has an identity map for simple find by id queries. See the website for documentation.
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#1067 Fields now accept a :versioned attribute to be able to disable what fields are versioned with Mongoid::Versioning. (Jim Benton)
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#587 Added order preference to many and many to many associations (Gregory Man)
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Added ability to chain order_by statements (Gregory Man)
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#961 Allow arbitrary Mongo::Connection options to pass through Mongoid::Config::Database object. (Morgan Nelson)
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Enable autosave for many to many references. (Dave Krupinski)
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The following explicit atomic operations have been added: Model#bit, Model#pop, Model#pull, Model#push_all, Model#rename, Model#unset.
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Added exception translations for Hindi. (Sukeerthi Adiga)
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#974 Fix attribute_present? to work correctly then attribute value is false, thanks to @nickhoffman (Gregory Man)
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#960 create indexes rake task is not recognizing a lot of mongoid models because it has problems guessing their model names from filenames (Tobias Schlottke)
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#874 Deleting from a M-M reference is one-sided (nickhoffman, davekrupinski)
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Replace deprecated class_inheritable_hash dropped in Rails 3.1+ (Konstantin Shabanov)
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Fix inconsistent state when replacing an entire many to many relation
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Don’t clobber inheritable attributes when adding subclass field inheritance (Dave Krupinski)
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#914 Querying embedded documents with ‘$or’ selector (Max Golovnia)
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#514 Fix marshaling of documents with relation extensions (Chris Griego)
Metadata#extension now returns a Module, instead of a Proc, when an extension is defined.
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#837 When allow_dynamic_fields is set to false and loading an embedded document with an unrecognized field, an exception is raised.
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#963 Initializing array of embedded documents via hash regressed (Chris Griego, Morgan Nelson)
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Mongoid::Config.reset resets the options to their default values.
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Mongoid::Fields.defaults is memoized for faster instantiation of models.