## Changes in 1.4.1

### Fixes

* Fix importing models that have required belongs_to associations and use composite primary keys. Thanks to @thoughtbot-summer vi \##783.

## Changes in 1.4.0

### New Features

  * Enable compatibility with frozen string literals. Thanks to @desheikh via \##760.

## Changes in 1.3.0

### Fixes

* Ensure correct timestamp values are returned for models after insert. Thanks to @kos1kov via \##756.
* Restore database_version method to public scope. Thanks to @beauraF via \##753.

### New Features

* Add support for ActiveRecord 7.0. Thanks to @nickhammond, @ryanwood, @jkowens via \##749 and \##752.
* Add support for compound foreign keys. Thanks to @Uladzimiro via \##750.
* Add support for :recursive combined with on_duplicate_key_update: :all. Thanks to @deathwish via \##746.

## Changes in 1.2.0

### Fixes

* Update JDBC MySQL adapter to use mysql2 connection adapter. Thanks to @terencechow via \##744.
* Fix importing STI models with ActiveRecord 6. Thanks to @clemens1483 via \##743.
* Use polymorphic_name instead of base_class.name for imports. Thanks to @kmhajjar via \##741.
* Fix compatibility issue with composite primary keys. Thanks to @dlanileonardo via \##737.
* Prevent double validation of associations on recursive import.

## Changes in 1.1.0

### New Features

*  Add batch progress reporting. Thanks to @gee-forr via \##729.

## Changes in 1.0.8

### Fixes

* Use correct method for clearing query cache. Thanks to @EtienneDepaulis via \##719.

## Changes in 1.0.7

### New Features

* Use @@max_allowed_packet session variable instead of querying SHOW VARIABLES. Thanks to @diclophis via \#706.
* Add option :track_validation_failures. When this is set to true, failed_instances will be an array of arrays, with each inner array having the form [:index_in_dataset, :object_with_errors]. Thanks to @rorymckinley  via \#684.

### Fixes

* Prevent mass-assignment errors in Rails strict mode. Thanks to @diclophis via \##709.

## Changes in 1.0.6

### Fixes

* Handle after_initialize callbacks. Thanks to @AhMohsen46 via \#691 and
  \#692.
* Fix regression introduced in 1.0.4. Explicitly allow adapters to
  support on duplicate key update. Thanks to @dsobiera, @jkowens via \#696.

## Changes in 1.0.5

### Fixes

* Allow serialized attributes to be returned from import. Thanks to @timanovsky, @jkowens via \#660.
* Return ActiveRecord::Connection from
  ActiveRecord::Base#establish_connection. Thanks to @reverentF via
\#663.
* Support PostgreSQL array. Thanks to @ujihisa via \#669.
* Skip loading association ids when column changed. Thanks to @Aristat
  via \#673.

## Changes in 1.0.4

### Fixes

* Use prepend pattern for ActiveRecord::Base#establish_connection patching. Thanks to @dombesz via \#648.
* Fix NoMethodError when using PostgreSQL ENUM types. Thanks to @sebcoetzee via \#651.
* Fix issue updating optimistic lock in Postgres. Thanks to @timanovsky
  via \#656.

## Changes in 1.0.3

### New Features

* Add support for ActiveRecord 6.1.0.alpha. Thanks to @imtayadeway via
  \#642.

### Fixes

* Return an empty array for results instead of nil when importing empty
  array. Thanks to @gyfis via \#636.

## Changes in 1.0.2

### New Features

* Add support for CockroachDB adapter. Thanks to @willie via \#605.
* Add support for ActiveRecord 6.0.0.rc1. Thanks to @madeindjs, @bill-filler,
  @jkowens via \#619, \#623.

### Fixes

* Fixes NoMethodError when attempting to use nil logger. Thanks to @MattMecel,
  @khiav22357.
* Fix issue validating STI models. Thanks to @thejbsmith, @jkowens via
  \#626.

## Changes in 1.0.1

### Fixes

* Raise an error with a helpful message if array of values exceeds the number of
  columns for a table. Thanks to @golddranks via \#589.
* Properly check if model responds to import before creating alias.
  Thanks to @jcw- via \#591.
* No longer pass :returning option to child associations on recursive
  import. Thanks to @dmitriy-kiriyenko via \#595.
* Fix import issue for models with Postgresql json/jsonb fields. Thanks
  to @stokarenko via \#594.
* Fix issue importing models with timestamps that contain timezone
  information. Thanks to @dekaikiwi, @jkowens via \#598.
* Ignore :no_returning when using :recursive option. Thanks to @dgollahon, @jkowens
  via \#599.

## Changes in 1.0.0

### New Features

* Move ActiveRecord::Dirty changes to previous_changes after import.
  Thanks to @stokarenko via \#584.

### Breaking Changes

* Previously :on_duplicate_key_update was enabled by default for MySQL.
  The update timestamp columns (updated_at, updated_on) would be updated
  on duplicate key. This was behavior is inconsistent with the other database
  adapters and could also be considered surprising. Going forward it must
  be explicitly enabled. See \#548.

## Changes in 0.28.2

### Fixes

* Fix issue where validations where not working in certain scenarios.
  Thanks to @CASIXx1 via \#579.

## Changes in 0.28.1

### Fixes

* Fix issue where ActiveRecord presence validations were being mutated.
  Limited custom presence validation to bulk imports.

## Changes in 0.28.0

### New Features

* Allow updated timestamps to be manually set.Thanks to @Rob117, @jkowens via \#570.

### Fixes

* Fix validating presence of belongs_to associations. Existence
  of the parent record is not validated, but the foreign key field
  cannot be empty. Thanks to @Rob117, @jkowens via \#575.

## Changes in 0.27.0

### New Features

* Add "secret" option validate_uniqueness to enable uniqueness
  validators when validating import. This is not a recommended
  approach (See #228), but is being added back in for projects
  that depended on this feature. Thanks to @jkowens via \#554.

## Changes in 0.26.0

### New Features

* Add  on_duplicate_key_update for SQLite. Thanks to @jkowens via \#542.
* Add option to update all fields on_duplicate_key_update. Thanks to @aimerald, @jkowens via \#543.

### Fixes

* Handle deeply frozen options hashes. Thanks to @jturkel via \#546.
* Switch from FactoryGirl to FactoryBot. Thanks to @koic via \#547.
* Allow import to work with ProxySQL. Thanks to @GregFarrell via \#550.

## Changes in 0.25.0

### New Features

* Add support for makara_postgis adapter. Thanks to @chadwilken via \#527.
* Skip validating presence of belongs_to associations. Thanks to @Sohair63, @naiyt, @jkowens via \#528.

### Fixes

* Add missing require for ActiveSupport.on_load. Thanks to @onk via \#529.
* Support setting attribute values in before_validation callbacks.
  Thanks to @SirRawlins, @jkowens via \#531.
* Ignore virtual columns. Thanks to @dbourguignon, @jkowens via \#530.

## Changes in 0.24.0

### Fixes

* Use the association primary key when importing. Thanks to @dpogue via \#512.
* Allow association ids to be updated. Thanks to @Aristat via \#515.

## Changes in 0.23.0

### New Features

* Rename `import` method to `bulk_import` and alias to `import`. Thanks
  to @itay-grudev, @jkowens via \#498.
* Increment lock_version on duplicate key update. Thanks to @aimerald
  via \#500.

### Fixes

* Fix import_without_validations_or_callbacks exception if array is empty.
  Thanks to @doloopwhile via \#508.

## Changes in 0.22.0

### New Features

* Add support for importing hashes thru a has many association. Thanks
  to @jkowens via \#483.

### Fixes

* Fix validation logic for recursive import. For those on Rails 5.0 and 5.1,
  this change requires models with polymorphic associations to specify the `inverse_of`
  argument (See issue #495). Thanks to @eric-simonton-sama, @jkowens via
  \#489.

## Changes in 0.21.0

### New Features

* Allow SQL subqueries (objects that respond to .to_sql) to be passed as values. Thanks
  to @jalada, @jkowens via \#471
* Raise an ArgumentError when importing an array of hashes if any of the
  hash objects have different keys. Thanks to @mbell697 via \#465.

### Fixes

* Fix issue loading incorrect foreign key value when syncing belongs_to
  associations with custom foreign key columns. Thanks to @marcgreenstock, @jkowens via \#470.
* Fix issue importing models with polymorphic belongs_to associations.
  Thanks to @zorab47, @jkowens via \#476.
* Fix issue importing STI models with ActiveRecord 4.0. Thanks to
  @kazuki-st, @jkowens via \#478.

## Changes in 0.20.2

### Fixes

* Unscope model when synchronizing with database. Thanks to @indigoviolet via \#455.

## Changes in 0.20.1

### Fixes

* Prevent :on_duplicate_key_update args from being modified. Thanks to @joshuamcginnis, @jkowens via \#451.

## Changes in 0.20.0

### New Features

* Allow returning columns to be specified for PostgreSQL. Thanks to
  @tjwp via \#433.

### Fixes

* Fixes an issue when bypassing uniqueness validators. Thanks to @vmaxv via \#444.
* For AR < 4.2, prevent type casting for binary columns on Postgresql. Thanks to @mwalsher via \#446.
* Fix issue logging class name on import. Thanks to @sophylee, @jkowens via \#447.
* Copy belongs_to association id to foreign key column before importing. Thanks to @jkowens via \#448.
* Reset model instance on validate. Thanks to @vmaxv via \#449.

## Changes in 0.19.1

### Fixes

* Fix a regression where models weren't properly being marked clean. Thanks to @tjwp via \#434.
* Raise ActiveRecord::Import::ValueSetTooLargeError when a record being inserted exceeds the
  `max_allowed_packet` for MySQL. Thanks to @saizai, @jkowens via \#437.
* Fix issue concatenating column names array with primary key. Thanks to @keeguon via \#440.

## Changes in 0.19.0

### New Features

* For PostgreSQL, add option to set WHERE condition in conflict_action. Thanks to
  @Saidbek via \#423.

### Fixes

* Fix issue importing saved records with serialized fields. Thanks to
  @Andreis13, @jkowens via \#425.
* Fix issue importing records that have columns defined with default values
  that are functions or expressions. Thanks to @Andreis13, @jkowens via \#428.

## Changes in 0.18.3

### Fixes

* Set models new_record attribute to false when importing with
  :on_duplicate_key_ignore. Thanks to @nijikon, @jkowens via \#416.

## Changes in 0.18.2

### Fixes

* Enable custom validate callbacks when validating import. Thanks to @afn via \#410.
* Prevent wrong IDs being set on models when using :on_duplicate_key_ignore.
  Thanks to @afn, @jkowens via \#412.

## Changes in 0.18.1

### Fixes

* Fix to enable validation callbacks (before_validation,
  after_validation). Thanks to @sinsoku, @jkowens via \#406.

## Changes in 0.18.0

### New Features

* Uniqueness validation is bypassed when validating models since
  it cannot be guaranteed if there are duplicates in a batch.
  Thanks to @jkowens via \#301.
* Allow for custom timestamp columns. Thanks to @mojidabckuu, @jkowens
  via \#401.

### Fixes

* Fix ActiveRecord 5 issue coercing boolean values when serializing
  for the database. Thanks to @rjrobinson, @jkowens via \#403.

## Changes in 0.17.2

### Fixes

* Fix issue where PostgreSQL cannot recognize columns if names
  include mixed case characters. Thanks to @hugobgranja via \#379.
* Fix an issue for ActiveRecord 5 where serialized fields with
  default values were not being typecast. Thanks to @whistlerbrk,
  @jkowens via \#386.
* Add option :force_single_insert for MySQL to make sure a single
  insert is attempted instead of performing multiple inserts based
  on max_allowed_packet. Thanks to @mtparet via \#387.

## Changes in 0.17.1

### Fixes

* Along with setting id on models for adapters that support it,
  add created_at and updated_at timestamps. Thanks to @jacob-carlborg
  via \#364.
* Properly set returned ids when using composite_primary_keys.
  Thanks to @guigs, @jkowens via \#371.

## Changes in 0.17.0

### New Features

* Add support for composite_primary_keys gem. Thanks to @jkowens
  via \#350.
* Add support for importing an array of hashes. Thanks to @jkowens
  via \#352.
* Add JDBC SQLite3 support. Thanks to @jkowens via \#356.

### Fixes

* Remove support for SQLite recursive imports. See \#351.
* Improve import speed for Rails 5. Thanks to @ranchodeluxe, @jkowens
  via \#359.

## Changes in 0.16.2

### Fixes

* Fixes issue clearing query cache on wrong connection when using
  multiple databases. Thanks to @KentoMoriwaki via \#337
* Raises an ArgumentError on incorrect usage of nested arrays. Thanks
  to @Nitrodist via \#340
* Fixes issue that prevented uuid primary keys from being set manually.
  Thanks to @Dclusin-og, @jkowens via \#342

## Changes in 0.16.1

### Fixes

* Fixes issue with missing error messages on failed instances when
  importing using arrays of columns and values. Thanks to @Fivell via \#332
* Update so SQLite only return ids if table has a primary key field via \#333


## Changes in 0.16.0

### New Features

* Add partial index upsert support for PostgreSQL. Thanks to @luislew via \#305
* Add UUID primary key support for PostgreSQL. Thanks to @jkowens via
  \#312
* Add store accessor support for JSON, JSON, and HSTORE data types.
  Thanks to @jkowens via \#322
* Log warning if database does not support :on_duplicate_key_update.
  Thanks to @jkowens via \#324
* Add option :on_duplicate_key_ignore for MySQL and SQLite. Thanks to
  @jkowens via \#326

### Fixes

* Fixes issue with recursive import using same primary key for all models.
  Thanks to @chopraanmol1 via \#309
* Fixes issue importing from STI subclass with polymorphic associations.
  Thanks to @JNajera via \#314
* Fixes issue setting returned IDs to wrong models when some fail validation. Also fixes issue with SQLite returning wrong IDs. Thanks to @mizukami234 via \#315


## Changes in 0.15.0

### New Features

* An ArgumentError is now raised if when no `conflict_target` or `conflict_name` is provided or can be determined when using the `on_duplicate_key_update` option for PostgreSQL. Thanks to @jkowens via \#290
* Support for Rails 5.0 final release for all except the JDBC driver which is not yet updated to support Rails 5.0

### Fixes

* activerecord-import no longer modifies a value array inside of the given values array when called with `import(columns, values)`. Thanks to @jkowens via \#291

### Misc

* `raise_error` is used to raise errors for ActiveRecord 5.0. Thanks to @couragecourag via \#294 `raise_record_invalid` has been


## Changes in 0.14.1

### Fixes

* JRuby/JDBCDriver with PostgreSQL will no longer raise a JDBCDriver error when using the :no_returning boolean option. Thanks to @jkowens via \#287

## Changes in 0.14.0

### New Features

* Support for ActiveRecord 3.1 has been dropped. Thanks to @sferik via \#254
* SQLite3 has learned the :recursive option. Thanks to @jkowens via \#281
* :on_duplicate_key_ignore will be ignored when imports are being done with :recursive. Thanks to @jkowens via \#268
* :activerecord-import learned how to tell PostgreSQL to return no data back from the import via the :no_returning boolean option. Thanks to @makaroni4 via \#276

### Fixes

* Polymorphic associations will not import the :type column. Thanks to @seanlinsley via \#282 and \#283
* ~2X speed increase for importing models with validations. Thanks to @jkowens via \#266

### Misc

* Benchmark HTML report has been fixed. Thanks to @jkowens via \#264
* seamless_database_pool has been updated to work with AR 5.0. Thanks to @jkowens via \#280
* Code cleanup, removal of redundant condition checks. Thanks to @pavlik4k via \#273
* Code cleanup, removal of deprecated `alias_method_chain`. Thanks to @codeodor via \#271


## Changes in 0.13.0

### New Features

* Addition of :batch_size option to control the number of rows to insert per INSERT statement. The default is the total number of records being inserted so there is a single INSERT statement. Thanks to @jkowens via \#245

* Addition `import!` which will raise an exception if a validation occurs. It will fail fast. Thanks to @jkowens via \#246

### Fixes

* Fixing issue with recursive import when utilizing the `:on_duplicate_key_update` option. The `on_duplicate_key_update` only applies to parent models at this time. Thanks to @yuri-karpovich for reporting and  @jkowens for fixing via \#249

### Misc

* Refactoring of fetching and assigning attributes. Thanks to @jkownes via \#259
* Lots of code cleanup and addition of Rubocop linter. Thanks to @sferik via \#256 and \#250
* Resolving errors with the test suite when running against ActiveRecord 4.0 and 4.1. Thanks to @jkowens via \#262
* Cleaning up the TravisCI settings and packages. Thanks to @sferik via \#258 and \#251

## Changes in 0.12.0

### New Features

* PostgreSQL UPSERT support has been added. Thanks @jkowens via \#218

### Fixes

* has_one and has_many associations will now be recursively imported regardless of :autosave being set. Thanks @sferik, @jkowens via \#243, \#234
* Fixing an issue with enum column support for Rails > 4.1. Thanks @aquajach via \#235

### Removals

* Support for em-synchrony has been removed since it appears the project has been abandoned. Thanks @sferik, @zdennis via \#239
* Support for the mysql gem/adapter has been removed since it has officially been abandoned. Use the mysql2 gem/adapter instead. Thanks @sferik, @zdennis via \#239

### Misc

* Cleaned up TravisCI output and removing deprecation warnings. Thanks @jkowens, @zdennis \#242


## Changes before 0.12.0

> Never look back. What's gone is now history. But in the process make memory of events to help you understand what will help you to make your dream a true story. Mistakes of the past are lessons, success of the past is inspiration. – Dr. Anil Kr Sinha