require 'spec_helper' describe CacheMarkdownField do # The minimum necessary ActiveModel to test this concern class ThingWithMarkdownFields include ActiveModel::Model include ActiveModel::Dirty include ActiveModel::Serialization class_attribute :attribute_names self.attribute_names = [] def attributes attribute_names.each_with_object({}) do |name, hsh| hsh[name.to_s] = send(name) end end extend ActiveModel::Callbacks define_model_callbacks :create, :update include CacheMarkdownField cache_markdown_field :foo cache_markdown_field :baz, pipeline: :single_line def self.add_attr(name) self.attribute_names += [name] define_attribute_methods(name) attr_reader(name) define_method("#{name}=") do |value| write_attribute(name, value) end end add_attr :cached_markdown_version [:foo, :foo_html, :bar, :baz, :baz_html].each do |name| add_attr(name) end def initialize(*) super # Pretend new is load clear_changes_information end def read_attribute(name) instance_variable_get("@#{name}") end def write_attribute(name, value) send("#{name}_will_change!") unless value == read_attribute(name) instance_variable_set("@#{name}", value) end def save run_callbacks :update do changes_applied end end end def thing_subclass(new_attr) Class.new(ThingWithMarkdownFields) { add_attr(new_attr) } end let(:markdown) { '`Foo`' } let(:html) { '

Foo

' } let(:updated_markdown) { '`Bar`' } let(:updated_html) { '

Bar

' } let(:thing) { ThingWithMarkdownFields.new(foo: markdown, foo_html: html, cached_markdown_version: CacheMarkdownField::CACHE_VERSION) } describe '.attributes' do it 'excludes cache attributes' do expect(thing.attributes.keys.sort).to eq(%w[bar baz foo]) end end context 'an unchanged markdown field' do before do thing.foo = thing.foo thing.save end it { expect(thing.foo).to eq(markdown) } it { expect(thing.foo_html).to eq(html) } it { expect(thing.foo_html_changed?).not_to be_truthy } it { expect(thing.cached_markdown_version).to eq(CacheMarkdownField::CACHE_VERSION) } end context 'a changed markdown field' do before do thing.foo = updated_markdown thing.save end it { expect(thing.foo_html).to eq(updated_html) } it { expect(thing.cached_markdown_version).to eq(CacheMarkdownField::CACHE_VERSION) } end context 'when a markdown field is set repeatedly to an empty string' do it do expect(thing).to receive(:refresh_markdown_cache).once thing.foo = '' thing.save thing.foo = '' thing.save end end context 'when a markdown field is set repeatedly to a string which renders as empty html' do it do expect(thing).to receive(:refresh_markdown_cache).once thing.foo = '[//]: # (This is also a comment.)' thing.save thing.foo = '[//]: # (This is also a comment.)' thing.save end end context 'a non-markdown field changed' do before do thing.bar = 'OK' thing.save end it { expect(thing.bar).to eq('OK') } it { expect(thing.foo).to eq(markdown) } it { expect(thing.foo_html).to eq(html) } it { expect(thing.cached_markdown_version).to eq(CacheMarkdownField::CACHE_VERSION) } end context 'version is out of date' do let(:thing) { ThingWithMarkdownFields.new(foo: updated_markdown, foo_html: html, cached_markdown_version: nil) } before do thing.save end it { expect(thing.foo_html).to eq(updated_html) } it { expect(thing.cached_markdown_version).to eq(CacheMarkdownField::CACHE_VERSION) } end describe '#cached_html_up_to_date?' do subject { thing.cached_html_up_to_date?(:foo) } it 'returns false when the version is absent' do thing.cached_markdown_version = nil is_expected.to be_falsy end it 'returns false when the version is too early' do thing.cached_markdown_version -= 1 is_expected.to be_falsy end it 'returns false when the version is too late' do thing.cached_markdown_version += 1 is_expected.to be_falsy end it 'returns true when the version is just right' do thing.cached_markdown_version = CacheMarkdownField::CACHE_VERSION is_expected.to be_truthy end it 'returns false if markdown has been changed but html has not' do thing.foo = updated_html is_expected.to be_falsy end it 'returns true if markdown has not been changed but html has' do thing.foo_html = updated_html is_expected.to be_truthy end it 'returns true if markdown and html have both been changed' do thing.foo = updated_markdown thing.foo_html = updated_html is_expected.to be_truthy end it 'returns false if the markdown field is set but the html is not' do thing.foo_html = nil is_expected.to be_falsy end end describe '#refresh_markdown_cache' do before do thing.foo = updated_markdown end it 'fills all html fields' do thing.refresh_markdown_cache expect(thing.foo_html).to eq(updated_html) expect(thing.foo_html_changed?).to be_truthy expect(thing.baz_html_changed?).to be_truthy end it 'does not save the result' do expect(thing).not_to receive(:update_columns) thing.refresh_markdown_cache end it 'updates the markdown cache version' do thing.cached_markdown_version = nil thing.refresh_markdown_cache expect(thing.cached_markdown_version).to eq(CacheMarkdownField::CACHE_VERSION) end end describe '#refresh_markdown_cache!' do before do thing.foo = updated_markdown end it 'fills all html fields' do thing.refresh_markdown_cache! expect(thing.foo_html).to eq(updated_html) expect(thing.foo_html_changed?).to be_truthy expect(thing.baz_html_changed?).to be_truthy end it 'skips saving if not persisted' do expect(thing).to receive(:persisted?).and_return(false) expect(thing).not_to receive(:update_columns) thing.refresh_markdown_cache! end it 'saves the changes using #update_columns' do expect(thing).to receive(:persisted?).and_return(true) expect(thing).to receive(:update_columns) .with("foo_html" => updated_html, "baz_html" => "", "cached_markdown_version" => CacheMarkdownField::CACHE_VERSION) thing.refresh_markdown_cache! end end describe '#banzai_render_context' do subject(:context) { thing.banzai_render_context(:foo) } it 'sets project to nil if the object lacks a project' do is_expected.to have_key(:project) expect(context[:project]).to be_nil end it 'excludes author if the object lacks an author' do is_expected.not_to have_key(:author) end it 'raises if the context for an unrecognised field is requested' do expect { thing.banzai_render_context(:not_found) }.to raise_error(ArgumentError) end it 'includes the pipeline' do baz = thing.banzai_render_context(:baz) expect(baz[:pipeline]).to eq(:single_line) end it 'returns copies of the context template' do template = thing.cached_markdown_fields[:baz] copy = thing.banzai_render_context(:baz) expect(copy).not_to be(template) end context 'with a project' do let(:thing) { thing_subclass(:project).new(foo: markdown, foo_html: html, project: :project_value) } it 'sets the project in the context' do is_expected.to have_key(:project) expect(context[:project]).to eq(:project_value) end it 'invalidates the cache when project changes' do thing.project = :new_project allow(Banzai::Renderer).to receive(:cacheless_render_field).and_return(updated_html) thing.save expect(thing.foo_html).to eq(updated_html) expect(thing.baz_html).to eq(updated_html) expect(thing.cached_markdown_version).to eq(CacheMarkdownField::CACHE_VERSION) end end context 'with an author' do let(:thing) { thing_subclass(:author).new(foo: markdown, foo_html: html, author: :author_value) } it 'sets the author in the context' do is_expected.to have_key(:author) expect(context[:author]).to eq(:author_value) end it 'invalidates the cache when author changes' do thing.author = :new_author allow(Banzai::Renderer).to receive(:cacheless_render_field).and_return(updated_html) thing.save expect(thing.foo_html).to eq(updated_html) expect(thing.baz_html).to eq(updated_html) expect(thing.cached_markdown_version).to eq(CacheMarkdownField::CACHE_VERSION) end end end end