1 files changed, 28 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/sqlite3/schema_statements.rb
index 2394982a7d..0a637d81fa 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite3/schema_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite3/schema_statements.rb
@@ -52,6 +52,34 @@ module ActiveRecord
           end.compact
         end
 
+        def add_foreign_key(from_table, to_table, **options)
+          alter_table(from_table) do |definition|
+            to_table = strip_table_name_prefix_and_suffix(to_table)
+            definition.foreign_key(to_table, options)
+          end
+        end
+
+        def remove_foreign_key(from_table, to_table = nil, **options)
+          to_table ||= options[:to_table]
+          options = options.except(:name, :to_table)
+          foreign_keys = foreign_keys(from_table)
+
+          fkey = foreign_keys.detect do |fk|
+            table = to_table || begin
+              table = options[:column].to_s.delete_suffix("_id")
+              Base.pluralize_table_names ? table.pluralize : table
+            end
+            table = strip_table_name_prefix_and_suffix(table)
+            fk_to_table = strip_table_name_prefix_and_suffix(fk.to_table)
+            fk_to_table == table && options.all? { |k, v| fk.options[k].to_s == v.to_s }
+          end || raise(ArgumentError, "Table '#{from_table}' has no foreign key for #{to_table}")
+
+          alter_table(from_table, foreign_keys) do |definition|
+            fk_to_table = strip_table_name_prefix_and_suffix(fkey.to_table)
+            definition.foreign_keys.delete([fk_to_table, fkey.options])
+          end
+        end
+
         def create_schema_dumper(options)
           SQLite3::SchemaDumper.create(self, options)
         end