Callback not saving value - ruby-on-rails

Question

I am writing some tests for a relatively complicated action that I need to occur when a record is destroyed.
These are my CheckIn functions and a CheckIn has_one :weigh_in:
def weight_loss
prev_ci = CheckIn.joins(:weigh_in)
.where(client_id: self.client_id)
.where('week < ?', self.week)
.where('weigh_ins.current_weight IS NOT NULL')
.order('week desc').first()
return 0 if self.weigh_in.nil? or prev_ci.nil? or prev_ci.weigh_in.nil?
change = prev_ci.weigh_in.current_weight.to_f - self.weigh_in.current_weight.to_f
return change.round(2)
end
def prev_ci
prev_ci = CheckIn.joins(:weigh_in)
.where(client_id: self.client_id)
.where('week < ?', self.week)
.where('weigh_ins.current_weight IS NOT NULL')
.order('week desc').first()
return prev_ci
end
def post_ci
post_ci = CheckIn.joins(:weigh_in)
.where(client_id: self.client_id)
.where('week > ?', self.week)
.where('weigh_ins.current_weight IS NOT NULL')
.order('week desc').first()
return nil if post_ci.nil? or post_ci.weigh_in.nil?
return post_ci
end
In my WeighIn model I have the following callbacks:
class WeighIn < ActiveRecord::Base
belongs_to :check_in
before_save :add_weightloss
after_destroy :adjust_weightloss
def add_weightloss
self.weightloss = 0
self.weightloss = self.check_in.weight_loss
end
def adjust_weightloss
post_ci = self.check_in.post_ci
unless post_ci.nil?
post_ci.weigh_in.weightloss = 0
post_ci.weigh_in.weightloss = post_ci.weight_loss
# Prints the correct value to pass the test (39.7)
p 6, post_ci.weigh_in
post_ci.weigh_in.save!
end
end
end
But my final test (for deletion) still fails:
RSpec.describe WeighIn, type: :model do
it "before_save weigh_in" do
ci1 = CheckIn.create!(client_id: 1, program_id: 1, week: 1)
ci2 = CheckIn.create!(client_id: 1, program_id: 1, week: 2)
ci3 = CheckIn.create!(client_id: 1, program_id: 1, week: 3)
ci4 = CheckIn.create!(client_id: 1, program_id: 1, week: 4)
wi1 = WeighIn.create!(check_in_id: ci1.id, client_id: 1, date: Date.today, current_weight: 100)
wi2 = WeighIn.create!(check_in_id: ci2.id, client_id: 1, date: Date.today, current_weight: 90)
wi3 = WeighIn.create!(check_in_id: ci4.id, client_id: 1, date: Date.today, current_weight: 70.5)
# Verifies functionality of before save
expect(wi1.weightloss).to eq 0
expect(wi2.weightloss).to eq 10
expect(wi3.weightloss).to eq 19.5
# Verifies fucntionality of update
wi_params = { check_in_id: ci4.id, client_id: 1, date: Date.today, current_weight: 60.3 }
wi3.update(wi_params)
expect(wi3.weightloss).to eq 29.7
# Verifies functionality of destroy
wi2.destroy
# Prints incorrect, old value, 29.7
p 'in test', wi3
expect(wi3.weightloss).to eq 39.7
end
end
It seems a though the functions are working properly but the record reverts back or is never saved / updated?

Answer 1

Can you try this to reload the object to check for a change?
expect(wi3.reload.weightloss).to eq 39.7