Introduce support for alias attributes

[leonidkroka]

Probably it's related to issues:
#728:

class MyModel < ActiveRecord::Base
  alias_attribute :foo, :baz
end

MyModel.import(%i[foo bar], %w[value_foo value_baz], validate: false, on_duplicate_key_update: { conflict_target: %i[bar], columns: %i[foo] })

#795:

class MyModel < ActiveRecord::Base
  self.ignored_columns = [:bar]
end

MyModel.import(%i[foo bar], %w[value_foo value_baz], validate: false, on_duplicate_key_ignore: true)
MyModel.import(%i[foo bar], %w[value_foo value_baz], validate: false, on_duplicate_key_update: { conflict_target: %i[foo], columns: %i[bar] })

[jkowens]

Awesome, thank you for this update! 🎉

[jkowens]

@leonidkroka I missed that that 4.2 specs had a failure. I'm ok with dropping support for AR 4.2 if necessary. Should we go that route or can that be resolved easily?

[leonidkroka]

@jkowens thank you for your support in fast applying changes
AR 4.2 has quite a different approach to building columns_hash, so would say it would be difficult to prepare a proper fix to fit AB 4.2 and newer versions at the same time.
Well, it's possible to go with if-else condition:

if respond_to?(:ignored_columns) && ignored_columns.any?
  connection.schema_cache.columns_hash(table_name)
else
  columns_hash
end

Have just opened the respective PR #800 (will rerun tests tomorrow)

Yeap, that doesn't look like a cool solution, so it's up to you to use that fix or drop support for AR 4.2

[jkowens]

Finally released in v1.5.0 🎉

[koshigoe]

@leonidkroka @jkowens

I think the @schema_columns_hash should be cleared by .reset_column_information.

👉 #809