scinote-web/app/models/sample_my_module.rb

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class SampleMyModule < ApplicationRecord
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after_create :increment_nr_of_module_samples
after_destroy :decrement_nr_of_module_samples
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validates :sample, :my_module, presence: true
# One sample can only be assigned once to a specific module
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validates_uniqueness_of :sample_id, scope: :my_module_id
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belongs_to :assigned_by,
foreign_key: 'assigned_by_id',
class_name: 'User',
optional: true
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belongs_to :sample, inverse_of: :sample_my_modules, optional: true
belongs_to :my_module, inverse_of: :sample_my_modules, optional: true
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def increment_nr_of_module_samples
my_module.increment!(:nr_of_assigned_samples)
sample.increment!(:nr_of_modules_assigned_to)
end
def decrement_nr_of_module_samples
my_module.decrement!(:nr_of_assigned_samples)
sample.decrement!(:nr_of_modules_assigned_to)
end
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end