#dynamic_schema always returns the newest schema

[aploshay]

#dynamic_schema has this typo:
find_by_id(id: ...)
which should be either find_by(id: ...) or find_by_id(...); as written, it always returns nil, which means this methods always ignores a set dynamic_schema_id value and resorts to the fallback condition and looks up (or creates) the newest available schema.