add collection index and show

spec/acceptance/collections_spec.rb

+require 'acceptance_helpers'
+
+resource 'Collections' do
+  header 'Accept', 'application/json'
+  header 'Content-Type', 'application/json'
+
+  before { 12.times { create(:collection) } }
+
+  let(:collections) { Collection.all }
+
+  get '/v1/collections' do
+    parameter :limit, 'Limit of collections'
+    parameter :offset, 'Offset of collections'
+
+    let(:limit) { 12 }
+    let(:offset) { 0 }
+
+    example_request 'Get a list of collections' do
+      expect(JSON.parse(response_body).map { |o| o['id'] }.sort).to eq(Collection.limit(limit).offset(offset).pluck(:id).sort)
+      expect(status).to eq(200)
+    end
+  end
+
+  get '/v1/collections/:id' do
+    let(:id) { collections.first.id }
+
+    example 'Get a collections' do
+      do_request
+      expect(path).to eq("/v1/collections/#{id}") # `:id` is replaced with the value of `id`
+      expect(response_body).to eq(Helper.serialize(Collection.find(id)))
+      expect(status).to eq(200)
+    end
+  end
+
+end

spec/factories/collections.rb

@@ -2,6 +2,21 @@ FactoryGirl.define do
   factory :collection do |f|
     owner
     f.name { Faker::University.name }
+    f.description { Faker::Lorem.sentence }
     f.privacy 'public'
+
+    transient do
+      tags_count 5
+      subjects_count 2
+      educational_stages_count 1
+    end
+
+    after(:create) do |collection, evaluator|
+      create_list(:tagging, evaluator.tags_count, taggable: collection)
+      [Subject, EducationalStage].each do |model|
+        table = model.to_s.tableize
+        collection.try(table.to_sym) << model.all.sample(evaluator.try("#{table}_count".to_sym))
+      end
+    end
   end
 end