Here is how I use array in a rails 5 model in migration
t.text :diagnoses, array: true, default: []
in model
class Patient < ApplicationRecord
serialize :diagnoses, Array
end
in my seed method I am doing it like
patient = Patient.create(first_name: 'John', last_name: 'Smith', admission: a)
patient.diagnoses = [1, 2]
patient.save!
It give an error as
ActiveRecord::SerializationTypeMismatch: can't dump `diagnoses`: was supposed to be a Array, but was a Integer. -- 0
Thanks for any help!
A while ago, I encountered this exact issue. I found the following workaround:
In your migration file:
t.text :diagnoses, array: true
Then in model:
class Patient < ApplicationRecord
serialize :diagnoses
after_initialize do |patient|
patient.diagnoses= [] if patient.diagnoses == nil
end
end
The after_initialize callback will be called whenever an Active Record object is instantiated, either by directly using new or when a record is loaded from the database.
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