- persisted? is the API defined in ActiveModel
- makes it easier for extension libraries to conform to ActiveModel APIs
  without concern for whether the extended object is specifically
  ActiveRecord

[#5927 state:committed]
Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>

Add some tests for functionality in JoinAssociation which already exists but was previously untested

code gardening: we have assert_(nil|blank|present), more concise, with better default failure messages - let's use them

[#4645 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Make use of assert_equal to test equallity between object assert expects and object and a message of error

[#4611 state:committed]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Signed-off-by: Nwycats <wycats@gmail.com>

Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

[#1196 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

Enable has_many :through for going through a has_one association on the join model [#2719 state:resolved]
Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

Oracle stores '' string as NULL
Oracle cannot have identifiers larger than 30 characters
added missing fixtures to test setup method

Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

Refactor HasManyThroughAssociation to inherit from HasManyAssociation. Association callbacks and <association>_ids= now work with hm:t. Closes #11516 [rubyruy]


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Add efficient #include? to AssociationCollection (for has_many/has_many :through/habtm).  [stopdropandrew]

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Fix issue where the :uniq option of a has_many :through association is ignored when find(:all) is called.  Closes #9407 [cavalle]

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Ensure that ActiveRecord::Calculations disambiguates field names with the table name. Closes #11027 [cavalle]

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Reapplies [8865] with some fixes


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* TestCase: introduce declared setup and teardown callbacks. Pass a list of methods and an optional block to call before setup or after teardown. Setup callbacks are run in the order declared; teardown callbacks are run in reverse.  [Jeremy Kemper]


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Fix HasManyThrough Association so it uses :conditions on the HasMany Association.  Closes #9729 [danger]

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