Expose unscoped results to mustache view

This commit:

  - adds methods to `scoped_search_results_presenter` to show unscoped
results from rummager in the view.
  - Amends `search_results_presenter` to put the `.to_hash` call inside the
  `.map` on the result builder. So now whenever `results` is called the
  returned array is read to be sent to the view. This is because we call
  `results` from `scoped_search_results_presenter` now too.
  - Adds a template for unscoped results
  - adds tests for `scoped_search_results_presenter`

`presentable_result_list` is the starting point for the biggest change
here. I'm not sure the implementation choices here are very obvious so
I'll explain them.

The design (results with an embedded list of other results) is difficult
to represent semantically in HTML. Ideally the extra results would be in
an `<aside>` tag outside of the result list, but the design has them
interrupting the list so that sighted users will notice them.

A compromise that I'm happy with is to have them nested in the list of
results like so:

```
<li>result 1</li>
<li>result 2</li>
<li>result 3</li>
<li>More results from GOV.UK
  <ol>
    <li>..</li>
    <li>..</li>
    <li>..</li>
  </ol>
</li>
<li>result 4</li>
etc
```
Given this markup, and the constraint of using a logic-less templating
language (mustache) the best way I could thing to achieve this HTML
was to pass mustache an object that contains this structure. The
responsibility for mashing up the scoped results and unscoped results
falls to `presentable_result_list`.

This software pattern is a bit uncomfortable because it pushes the
design of the interface ("the unscoped results should be nested") onto
the presenter, though it should be the view's responsibility. However
it is the only way I can think to write it.

app/presenters/scoped_search_results_presenter.rb

@@ -4,16 +4,56 @@ def to_hash
     super.merge({
       is_scoped?: true,
       scope_title: scope_title,
+      unscoped_results_any?: unscoped_results.any?,
+      unscoped_result_count: result_count_string(unscoped_result_count),
+      results: presentable_result_list,
     })
   end
 
 private
 
+  attr_reader :unscoped_results
+
   def filter_fields
+    []
   end
 
   def scope_title
-    search_response[:scope][:title]
+    search_response["scope"]["title"]
+  end
+
+  def presentable_result_list
+    presentable_result_list = []
+    presentable_result_list = results
+
+    if unscoped_results.any?
+      insertion_point = results.count > 3 ? 3 : results.count
+      unscoped_results_sublist = { results: unscoped_results, is_multiple_results: true }
+
+      presentable_result_list.insert(insertion_point, unscoped_results_sublist)
+    end
+    presentable_result_list
+  end
+
+  def unscoped_result_count
+    search_response["unscoped_results"]["total"]
+  end
+
+  def unscoped_results
+    @unscoped_results ||= build_result_presenters
+
+  end
+
+  def build_result_presenters
+    search_response["unscoped_results"]["results"].map { |result| build_result(result).to_hash }
+  end
+
+  def results
+    search_response["results"].map { |result| build_scoped_result(result).to_hash }
+  end
+
+  def build_scoped_result(result)
+    ScopedResult.new(search_parameters, result)
   end
 
 end

app/presenters/search_results_presenter.rb

@@ -19,7 +19,7 @@ def to_hash
       result_count: result_count,
       result_count_string: result_count_string(result_count),
       results_any?: results.any?,
-      results: results.map { |result| result.to_hash },
+      results: results,
       filter_fields: filter_fields,
       debug_score: search_parameters.debug_score,
       has_next_page?: has_next_page?,
@@ -71,7 +71,7 @@ def result_count_string(count)
   end
 
   def results
-    search_response["results"].map { |result| build_result(result) }
+    search_response["results"].map { |result| build_result(result).to_hash }
   end
 
   def build_result(result)

app/views/search/_results_list.mustache

@@ -2,7 +2,9 @@
   {{#is_scoped?}}
     <strong>{{ result_count_string }} found in</strong><br>
     {{scope_title}}<br>
-    <a href='/search?q={{query}}'>Display results from all of GOV.UK</a>
+    {{#unscoped_results_any?}}
+      <a href='/search?q={{query}}'>Display {{unscoped_result_count}} from all of GOV.UK</a>
+    {{/unscoped_results_any?}}
   {{/is_scoped?}}
   {{^is_scoped?}}
     {{ result_count_string }} found
@@ -12,7 +14,12 @@
 {{#results_any?}}
   <ol class="results-list{{#debug_score}} debug{{/debug_score}}" id="js-live-search-results" start="{{first_result_number}}">
     {{#results}}
-      {{>search/_result}}
+      {{#is_multiple_results}}
+        {{>search/_sublist}}
+      {{/is_multiple_results}}
+      {{^is_multiple_results}}
+        {{>search/_result}}
+      {{/is_multiple_results}}
     {{/results}}
   </ol>
 

app/views/search/_sublist.mustache

@@ -0,0 +1,11 @@
+<li class='descoped-results'>
+  <div class='descope-message'>
+    <a href='/search?q={{query}}'>Display {{unscoped_result_count}} from all of GOV.UK</a>
+  </div>
+  <ol>
+    {{#results}}
+      {{>search/_result}}
+    {{/results}}
+  </ol>
+</li>
+

test/unit/presenters/scoped_search_results_presenter_test.rb

@@ -0,0 +1,104 @@
+require_relative "../../test_helper"
+
+class ScopedSearchResultsPresenterTest < ActiveSupport::TestCase
+  setup do
+    @scope_title = stub
+    @unscoped_result_count = stub
+
+    @scoped_results = [{"title"=> "scoped_result_1"},
+                       {"title"=> "scoped_result_2"},
+                       {"title"=> "scoped_result_3"},
+                       {"title"=> "scoped_result_4"},
+                       ]
+    @unscoped_results = [{"title"=> "unscoped_result_1"},
+                        {"title"=> "unscoped_result_2"},
+                        {"title"=> "unscoped_result_3"},
+                        ]
+
+    @search_response =  { "result_count" => "50",
+                          "results" => @scoped_results,
+                          "scope" => {
+                            "title" => @scope_title,
+                          },
+                          "unscoped_results" => {
+                            "total" => @unscoped_result_count,
+                            "results" => @unscoped_results,
+                          },
+                        }
+
+
+    @search_parameters = stub(search_term: 'words',
+                              debug_score: 1,
+                              start: 1,
+                              count: 1,
+                              build_link: 1,
+                              )
+  end
+
+  should "return a hash that has is_scoped set to true" do
+    results = ScopedSearchResultsPresenter.new(@search_response, @search_parameters)
+    assert_equal true, results.to_hash[:is_scoped?]
+  end
+
+  should "return a hash with the scope_title set to the scope title from the @search_response" do
+    results = ScopedSearchResultsPresenter.new(@search_response, @search_parameters)
+    assert_equal @scope_title, results.to_hash[:scope_title]
+  end
+
+  should "return a hash result count set to the scope title from the @search_response" do
+    results = ScopedSearchResultsPresenter.new(@search_response, @search_parameters)
+    assert_equal "#{@unscoped_result_count} results", results.to_hash[:unscoped_result_count]
+  end
+
+  context "presentable result list" do
+
+    should "return all scoped results with unscoped results inserted at position 4" do
+      results = ScopedSearchResultsPresenter.new(@search_response, @search_parameters).to_hash
+
+      ##
+      # This test is asserting that the format of `presentable_list` is:
+      # [result, result, result, {results: list_of_results, is_multiple_results: true}, result ...]
+      # Where list_of_results are the top three results from an unscoped request to rummager
+      # and a flag `is_multiple_results` set to true.
+      ##
+
+      # Scoped results
+      @scoped_results[0..2].each_with_index do | result, i |
+        assert_equal result["title"], results[:results][i][:title]
+      end
+
+      # Check un-scoped sub-list has flag
+      assert_equal true, results[:results][3][:is_multiple_results]
+
+      # iterate unscoped sublist of results
+      @unscoped_results.each_with_index do | result, i |
+        assert_equal result["title"], results[:results][3][:results][i][:title]
+      end
+
+      # iterate remaining results
+      @scoped_results[3..-1].each_with_index do | result, i |
+        assert_equal result["title"], results[:results][i+4][:title]
+      end
+    end
+  end
+
+  context "no scoped results returned" do
+    setup do
+      @no_results = []
+      @search_response["unscoped_results"]["results"] = @no_results
+    end
+
+    should "not not include unscoped results in the presentable_list if there aren't any" do
+      results = ScopedSearchResultsPresenter.new(@search_response, @search_parameters).to_hash
+
+      @scoped_results.each_with_index do | result, i |
+        assert_equal result["title"], results[:results][i][:title]
+      end
+    end
+
+    should "not set unscoped_results_any? to false" do
+      results = ScopedSearchResultsPresenter.new(@search_response, @search_parameters).to_hash
+      assert_equal false, results.to_hash[:unscoped_results_any?]
+    end
+  end
+end