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| author | Jean Boussier <jean.boussier@gmail.com> | 2019-04-08 13:10:15 +0200 |
|---|---|---|
| committer | Jean Boussier <jean.boussier@gmail.com> | 2019-06-03 13:31:42 +0200 |
| commit | 17acb771d815f030ac1cf36b1af4050f02816c39 (patch) | |
| tree | 7ebab580a70c36274c18011546e357f532f7b0a5 /activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb | |
| parent | eece0bf1087dc2cb59605a5a9beb88c6b935c194 (diff) | |
| download | rails-17acb771d815f030ac1cf36b1af4050f02816c39.tar.gz rails-17acb771d815f030ac1cf36b1af4050f02816c39.tar.bz2 rails-17acb771d815f030ac1cf36b1af4050f02816c39.zip | |
Deduplicate various Active Record schema cache structures
Real world database schemas contain a lot of duplicated data.
Some column names like `id`, `created_at` etc can easily be repeated
hundreds of times. Same for SqlTypeMetada, most database will contain
only a limited number of possible combinations.
This result in a lot of wasted memory.
The idea here is to make these data sctructures immutable, use a registry
to substitute similar instances with pre-existing ones.
Diffstat (limited to 'activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb')
| -rw-r--r-- | activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb index 7f3f32162e..733a8f1c86 100644 --- a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb +++ b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb @@ -381,6 +381,7 @@ module ActiveRecord if from_primary_key.is_a?(Array) @definition.primary_keys from_primary_key end + columns(from).each do |column| column_name = options[:rename] ? (options[:rename][column.name] || |