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require 'spec_helper'
describe Draper::CollectionDecorator do
before { ApplicationController.new.view_context }
subject { Draper::CollectionDecorator.new(source, with: ProductDecorator) }
let(:source){ [Product.new, Product.new] }
let(:non_active_model_source){ NonActiveModelProduct.new }
it "decorates a collection's items" do
subject.each do |item|
item.should be_decorated_with ProductDecorator
end
end
it "sets the decorated items' source models" do
subject.map{|item| item.source}.should == source
end
describe "#source" do
it "duplicates the source collection" do
subject.source.should == source
subject.source.should_not be source
end
it "is frozen" do
subject.source.should be_frozen
end
it "is aliased to #to_source" do
subject.to_source.should == source
end
end
describe "#decorated_collection" do
it "is frozen" do
subject.decorated_collection.should be_frozen
end
end
context "with context" do
subject { Draper::CollectionDecorator.new(source, with: ProductDecorator, context: {some: 'context'}) }
its(:context) { should == {some: 'context'} }
it "passes context to the individual decorators" do
subject.each do |item|
item.context.should == {some: 'context'}
end
end
it "does not tie the individual decorators' contexts together" do
subject.each do |item|
item.context.should == {some: 'context'}
item.context = {alt: 'context'}
item.context.should == {alt: 'context'}
end
end
describe "#context=" do
it "updates the collection decorator's context" do
subject.context = {other: 'context'}
subject.context.should == {other: 'context'}
end
context "when the collection is already decorated" do
it "updates the items' context" do
subject.decorated_collection
subject.context = {other: 'context'}
subject.each do |item|
item.context.should == {other: 'context'}
end
end
end
context "when the collection has not yet been decorated" do
it "does not trigger decoration" do
subject.should_not_receive(:decorated_collection)
subject.context = {other: 'context'}
end
it "sets context after decoration is triggered" do
subject.context = {other: 'context'}
subject.each do |item|
item.context.should == {other: 'context'}
end
end
end
end
end
describe "#initialize" do
describe "options validation" do
let(:valid_options) { {with: ProductDecorator, context: {}} }
it "does not raise error on valid options" do
expect { Draper::CollectionDecorator.new(source, valid_options) }.to_not raise_error
end
it "raises error on invalid options" do
expect { Draper::CollectionDecorator.new(source, valid_options.merge(foo: 'bar')) }.to raise_error(ArgumentError, 'Unknown key: foo')
end
end
end
describe "item decoration" do
subject { subject_class.new(source, options) }
let(:decorator_classes) { subject.decorated_collection.map(&:class) }
let(:source) { [Product.new, Widget.new] }
context "when the :with option was given" do
let(:options) { {with: SpecificProductDecorator} }
context "and the decorator can't be inferred from the class" do
let(:subject_class) { Draper::CollectionDecorator }
it "uses the :with option" do
decorator_classes.should == [SpecificProductDecorator, SpecificProductDecorator]
end
end
context "and the decorator is inferrable from the class" do
let(:subject_class) { ProductsDecorator }
it "uses the :with option" do
decorator_classes.should == [SpecificProductDecorator, SpecificProductDecorator]
end
end
end
context "when the :with option was not given" do
let(:options) { {} }
context "and the decorator can't be inferred from the class" do
let(:subject_class) { Draper::CollectionDecorator }
it "infers the decorator from each item" do
decorator_classes.should == [ProductDecorator, WidgetDecorator]
end
end
context "and the decorator is inferrable from the class" do
let(:subject_class) { ProductsDecorator}
it "infers the decorator" do
decorator_classes.should == [ProductDecorator, ProductDecorator]
end
end
end
end
describe "#find" do
context "with a block" do
it "decorates Enumerable#find" do
subject.stub decorated_collection: []
subject.decorated_collection.should_receive(:find)
subject.find {|p| p.title == "title" }
end
end
context "without a block" do
it "decorates Model.find" do
source.should_not_receive(:find)
Product.should_receive(:find).with(1).and_return(:product)
subject.find(1).should == ProductDecorator.new(:product)
end
end
end
describe "#helpers" do
it "returns a HelperProxy" do
subject.helpers.should be_a Draper::HelperProxy
end
it "is aliased to #h" do
subject.h.should be subject.helpers
end
it "initializes the wrapper only once" do
helper_proxy = subject.helpers
helper_proxy.stub(:test_method) { "test_method" }
subject.helpers.test_method.should == "test_method"
subject.helpers.test_method.should == "test_method"
end
end
describe "#localize" do
before { subject.helpers.should_receive(:localize).with(:an_object, {some: 'parameter'}) }
it "delegates to helpers" do
subject.localize(:an_object, some: 'parameter')
end
it "is aliased to #l" do
subject.l(:an_object, some: 'parameter')
end
end
describe ".helpers" do
it "returns a HelperProxy" do
subject.class.helpers.should be_a Draper::HelperProxy
end
it "is aliased to .h" do
subject.class.h.should be subject.class.helpers
end
end
describe "#to_ary" do
# required for `render @collection` in Rails
it "delegates to the decorated collection" do
subject.stub decorated_collection: double(to_ary: :an_array)
subject.to_ary.should == :an_array
end
end
describe "#respond_to?" do
it "returns true for its own methods" do
subject.should respond_to :decorated_collection
end
it "returns true for the wrapped collection's methods" do
source.stub(:respond_to?).with(:whatever, true).and_return(true)
subject.respond_to?(:whatever, true).should be_true
end
end
it "delegates array methods to the decorated collection" do
subject.stub decorated_collection: []
subject.decorated_collection.should_receive(:[]).with(42).and_return(:the_answer)
subject[42].should == :the_answer
end
describe "#==" do
context "when comparing to a collection decorator with the same source" do
it "returns true" do
a = Draper::CollectionDecorator.new(source, with: ProductDecorator)
b = ProductsDecorator.new(source)
a.should == b
end
end
context "when comparing to a collection decorator with a different source" do
it "returns false" do
a = Draper::CollectionDecorator.new(source, with: ProductDecorator)
b = ProductsDecorator.new([Product.new])
a.should_not == b
end
end
context "when comparing to a collection of the same items" do
it "returns true" do
a = Draper::CollectionDecorator.new(source, with: ProductDecorator)
b = source.dup
a.should == b
end
end
context "when comparing to a collection of different items" do
it "returns true" do
a = Draper::CollectionDecorator.new(source, with: ProductDecorator)
b = [Product.new]
a.should_not == b
end
end
end
it "pretends to be the source class" do
subject.kind_of?(source.class).should be_true
subject.is_a?(source.class).should be_true
end
it "is still its own class" do
subject.kind_of?(subject.class).should be_true
subject.is_a?(subject.class).should be_true
end
describe "#method_missing" do
before do
class << source
def page_number
42
end
end
end
it "proxies unknown methods to the source collection" do
subject.page_number.should == 42
end
end
describe "#to_s" do
subject { Draper::CollectionDecorator.new(source, options) }
let(:source) { ["a", "b", "c"] }
context "when :with option was given" do
let(:options) { {with: ProductDecorator} }
it "returns a string representation of the CollectionDecorator" do
subject.to_s.should == '#<CollectionDecorator of ProductDecorator for ["a", "b", "c"]>'
end
end
context "when :with option was not given" do
let(:options) { {} }
it "returns a string representation of the CollectionDecorator" do
subject.to_s.should == '#<CollectionDecorator of inferred decorators for ["a", "b", "c"]>'
end
end
end
end
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