feat: SQLite support

Author: Mattia Roccoberton

lib/active_storage/service/db_service.rb

@@ -47,7 +47,7 @@ def download_chunk(key, range)
       instrument :download_chunk, key: key, range: range do
         from = range.begin + 1
         size = range.size
-        args = adapter_sqlserver? ? "data, #{from}, #{size}" : "data FROM #{from} FOR #{size}"
+        args = adapter_sqlserver? || adapter_sqlite? ? "data, #{from}, #{size}" : "data FROM #{from} FOR #{size}"
         record = object_for(key, fields: "SUBSTRING(#{args}) AS chunk")
         raise(ActiveStorage::FileNotFoundError) unless record
 
@@ -102,6 +102,10 @@ def headers_for_direct_upload(_key, content_type:, **)
 
     private
 
+    def adapter_sqlite?
+      @adapter_sqlite ||= ActiveStorageDB::File.connection.adapter_name == 'SQLite'
+    end
+
     def adapter_sqlserver?
       @adapter_sqlserver ||= ActiveStorageDB::File.connection.adapter_name == 'SQLServer'
     end

lib/active_storage/service/db_service_rails70.rb

@@ -9,7 +9,7 @@ def compose(source_keys, destination_key, **)
         if buffer
           buffer << data
         else
-          buffer = data
+          buffer = +data
         end
       end
       ::ActiveStorageDB::File.create!(ref: destination_key, data: buffer) if buffer

spec/dummy61/config/database.yml

@@ -29,6 +29,12 @@ test: &test
   encoding: utf8
   min_messages: warning
   pool: <%= ENV.fetch('RAILS_MAX_THREADS') { 5 } %>
+<% when 'sqlite' %>
+test: &test
+  adapter: sqlite3
+  database: db/test.sqlite3
+  encoding: utf8
+  pool: <%= ENV.fetch('RAILS_MAX_THREADS') { 5 } %>
 <% else %>
   <% raise "Invalid or empty env DB_TEST #{ENV['DB_TEST']}" %>
 <% end %>

spec/dummy70/config/database.yml

@@ -29,6 +29,12 @@ test: &test
   encoding: utf8
   min_messages: warning
   pool: <%= ENV.fetch('RAILS_MAX_THREADS') { 5 } %>
+<% when 'sqlite' %>
+test: &test
+  adapter: sqlite3
+  database: db/test.sqlite3
+  encoding: utf8
+  pool: <%= ENV.fetch('RAILS_MAX_THREADS') { 5 } %>
 <% else %>
   <% raise "Invalid or empty env DB_TEST #{ENV['DB_TEST']}" %>
 <% end %>