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You can use a passed in parameter such as a date or a user_id (something that will change at run-time and so will need that 'lazy evaluation', with a lambda, like this: but as always with ruby they are nice little syntactical shortcuts (or 'sugar') to make things easier for you!In fact they are Class level methods as they operate on the 1 set of 'all' records.This can take a while if you have a lot of records, it is why I like to separate it into a rake task. With this method, the query is not actually executed until actual results are needed (lazy evaluation), so 7 scopes could be chained together but only resulting in 1 actual database query, to avoid performance problems from executing 7 separate queries.You could have done this in the migration, but I like to do this in a separate rake task.Create a rake file in your lib folder called "update_birth_date_fields.rake" This rake task will iterate through all users that have a date of birth, and will update the fields.They changed it because it was too easy to pass in something dynamic (like the current time).My SQL uses Month(xx) whereas SQLite requires a string format function).
Their format is changing however, with rails 4 there are deprecation warning when using #scope without passing a callable object.For example scope :red, where(color: 'red') should be changed to Notice that the order statement is placed in a block denoted by the curly braces.If you have an application that stores people and their birth dates, it can be suprisingly difficult to find out whose birthdays are this month or next month.There are two common approaches used for this: This post will go with option 2, as it is very difficult to find a SQL query solution that works on all databases (eg.
We want to add two new fields to this model for the day and month of the date of birth.
The following migration generator will achieve this: The next step is to make sure you populate these fields for all of your existing records.