110 lines
4 KiB
Ruby
110 lines
4 KiB
Ruby
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RSpec.shared_examples 'ApplicationModel::CanLookup' do
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describe '.lookup_keys' do
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it 'returns a subset of: id, name, login, email, number' do
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expect(described_class.lookup_keys)
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.to all(be_in(%i[id name login email number]))
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end
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it 'only includes attributes present on the model' do
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expect(described_class.lookup_keys)
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.to all(be_in(described_class.attribute_names.map(&:to_sym)))
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end
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end
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describe '.lookup' do
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around do |example|
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Rails.cache.clear
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example.run
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Rails.cache.clear
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end
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let!(:instance) { create(described_class.name.underscore) }
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let(:valid_lookup_key) { (described_class.lookup_keys - [:id]).sample }
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let(:invalid_lookup_key) { (described_class.attribute_names.map(&:to_sym) - described_class.lookup_keys).sample }
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it 'accepts exactly one attribute-value pair' do
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expect { described_class.lookup(id: instance.id, valid_lookup_key => 'foo') }
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.to raise_error(ArgumentError)
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end
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it 'only accepts attributes from .lookup_keys' do
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expect { described_class.lookup(invalid_lookup_key => 'foo') }
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.to raise_error(ArgumentError)
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end
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shared_examples 'per-attribute examples' do |attribute|
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it "finds records by #{attribute} (like .find_by)" do
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expect(described_class.lookup(attribute => instance.send(attribute))).to eq(instance)
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end
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describe "cache storage by #{attribute}" do
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context 'inside a DB transaction' do # provided by default RSpec config
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it 'leaves the cache untouched' do
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expect { described_class.lookup(attribute => instance.send(attribute)) }
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.not_to change { described_class.cache_get(instance.send(attribute)) }
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end
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end
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context 'outside a DB transaction' do
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before do
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allow(ActiveRecord::Base.connection)
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.to receive(:transaction_open?).and_return(false)
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end
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context 'when called for the first time' do
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it 'saves the value to the cache' do
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expect(Rails.cache)
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.to receive(:write)
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.with("#{described_class}::#{instance.send(attribute)}", instance, { expires_in: 7.days })
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.and_call_original
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expect { described_class.lookup(attribute => instance.send(attribute)) }
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.to change { described_class.cache_get(instance.send(attribute)) }
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.to(instance)
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end
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end
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context 'when called a second time' do
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before { described_class.lookup(attribute => instance.send(attribute)) }
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it 'retrieves results from cache' do
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expect(Rails.cache)
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.to receive(:read)
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.with("#{described_class}::#{instance.send(attribute)}")
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described_class.lookup(attribute => instance.send(attribute))
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end
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if attribute != :id
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context 'after it has been updated' do
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let!(:old_attribute_val) { instance.send(attribute) }
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let!(:new_attribute_val) { instance.send(attribute).next }
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it 'moves the record to a new cache key' do
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expect { instance.update(attribute => new_attribute_val) }
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.to change { described_class.cache_get(old_attribute_val) }.to(nil)
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expect { described_class.lookup({ attribute => instance.send(attribute) }) }
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.to change { described_class.cache_get(new_attribute_val) }.to(instance)
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end
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end
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end
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context 'after it has been destroyed' do
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it 'returns nil' do
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expect { instance.destroy }
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.to change { described_class.cache_get(instance.send(attribute)) }
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.to(nil)
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end
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end
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end
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end
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end
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end
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described_class.lookup_keys.each do |key|
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include_examples 'per-attribute examples', key
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end
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end
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end
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