Investigate casting duration to iso8601

[stevepolitodesign]

We need to call iso8601 on any duration passed to a scope in order for the query to execute correctly. This is odd because Rails should know how to cast this value by default.

scope :quick, -> {
  joins(:steps).group(:id).having("SUM(duration) <= ?", 15.minutes)
}

Recipe.quick
# => operator does not exist: interval <= integer

[stevepolitodesign]

After further research, I determined that this is the expected behavior. Using a hash condition solves for this otherwise.