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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) { '<p dir="auto"><code>Foo</code></p>' }
let(:updated_markdown) { '`Bar`' }
let(:updated_html) { '<p dir="auto"><code>Bar</code></p>' }
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 '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