Assuming that your “date attribute” is a date (rather than a full timestamp) then a simple where will give you your “find by date”:
Model.where(:date_column => date) You don’t want find_by_date_column as that will give at most one result.
For the year, month, and day queries you’d want to use the extract SQL function:
Model.where('extract(year from date_column) = ?', desired_year) Model.where('extract(month from date_column) = ?', desired_month) Model.where('extract(day from date_column) = ?', desired_day_of_month)
Column need to be type of date and SQLite has its own rules.