How can I create a validation where committed presence needs to be true only if the challenge's category is habit?
class Challenge < ActiveRecord::Base
CATEGORY = ['goal', 'habit']
serialize :committed, Array
validates :committed, presence: true, if: :habit # I also tried with 'habit' & 'Habit'
end
Since your category is called 'habit' (note, it is not 'Habit'), the validation would look as follows:
validates :committed, presence: true, if: ->(c) { c.category == 'habit' }
As a sidenote: I do not think your scopes will work, unless you have a column called categories in your challenges table.
Thus, if your intention was to select challenges, which have category 'habit', the scope would look as follows:
scope :habit, -> { where(category: 'habit') }
As per discussion in comments, if you want committed to be nil instead of [""] when nothing is there, add custom validation:
validate :committed_content
private
def committed_content
self.committed = nil if committed.empty? || committed.all?(&:blank?)
true
end
syntax error, unexpected '.' ... true, if: ->(c) { c.category&.== 'habit' }
validates :committed, presence: true, if: ->(c) { c.category == 'habit' }serialize :committed, Array that I didn't include in the question :/ and so even if nothing is :committed I see it is passing in the database as committed: [""] instead of nil. You know I can make the validation work for this?[""] in the database and want to prevent it from being saved? If yes, you should add content validation. let me edit the question once you confirmnil when empty. Either way works if you know how. Thanks good sir!validates :committed, presence: true, :if => lambda { |c| c.category == 'Habit' }
syntax error, unexpected => ...committed, presence: true, if => lambda { |c| c.categories ==... ... ^
uninitialized constant ActiveSupport::Callbacks::Callback::HabitYou can have a method and use it like this:
validates :committed, presence: true, if: :habit?
def habit?
self.category == 'habit'
end
t.string "category"@Nobita