make solution required

app/models/initiative.rb

@@ -23,6 +23,12 @@ class Initiative < ApplicationRecord
             :lead_group,
             presence: true
 
+  validate :at_least_one_solution_or_theme
+
+  def at_least_one_solution_or_theme
+    errors.add(:solution, 'at least one equired') if solutions.empty? && themes.empty?
+  end
+
   def set_default_location
     self.latitude ||= 51.742
     self.longitude ||= -2.222

app/views/initiatives/_form.html.erb

@@ -123,7 +123,7 @@
 
   <h2>Solutions</h2>
 
-  <%= f.form_field :choose_solution, required: true do %>
+  <%= f.form_field :solution, required: true do %>
     <input type="hidden" id="initial_themes" value="<%=themes_as_json(initiative)%>">
     <input type="hidden" id="initial_solutions" value="<%=solutions_as_json(initiative)%>">
     <div id="solution_picker"></div>

test/controllers/initiatives_controller_test.rb

@@ -111,7 +111,7 @@ def header_image
     @initiative.images.attach(header_image)
     images = [avenue_image]
     patch initiative_url(@initiative),
-          params: update_params(@initiative, images)
+          params: update_params(@initiative, images: images)
     assert_equal 2, @initiative.reload.images.size
     websites = @initiative.websites
     assert_equal 2, websites.size
@@ -124,6 +124,7 @@ def header_image
 
   # rubocop:disable Metrics/MethodLength
   def create_params(initiative, lead_group: nil, images: nil, solutions: nil)
+    solutions ||= default_solutions
     {
       initiative: {
         anticipated_carbon_saving: initiative.anticipated_carbon_saving,
@@ -149,7 +150,8 @@ def create_params(initiative, lead_group: nil, images: nil, solutions: nil)
     }
   end
 
-  def update_params(initiative, images)
+  def update_params(initiative, images: nil, solutions: nil)
+    solutions ||= default_solutions
     {
       initiative: {
         anticipated_carbon_saving: initiative.anticipated_carbon_saving,
@@ -165,6 +167,7 @@ def update_params(initiative, images)
         summary: initiative.summary,
         images: images,
         consent_to_share: true,
+        solutions_attributes: solutions,
         websites_attributes: [
           { website: 'http://one' },
           { website: 'http://two' }
@@ -173,4 +176,11 @@ def update_params(initiative, images)
     }
   end
   # rubocop:enable Metrics/MethodLength
+
+  def default_solutions
+    solution_class = SolutionSolutionClass.last.solution_class
+    solution = SolutionSolutionClass.last.solution
+
+    { '0': { solution_class_id: solution_class.id, solution_id: solution.id } }
+  end
 end

test/fixtures/initiative_solutions.yml

@@ -1,11 +1,6 @@
 # Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
 
-one:
-  solution: one
-  solution_class: one
-  initiative: one
-
-two:
-  solution: two
-  solution_class: two
-  initiative: two
+fruit_exchange_ashp:
+  solution: ashp
+  solution_class: heat_pumps
+  initiative: fruit_exchange

test/models/initiative_test.rb

@@ -59,7 +59,14 @@ def expected_initiative_attributes
         summary:
           'The Fruit Exchange connects food outlets with people who have surplus fruit or veg.',
         status: 'Operational',
-        solutions: [],
+        solutions: [
+          {
+            sector: 'Energy',
+            theme: 'Heating',
+            class: 'Heat pumps',
+            solution: 'ASHP'
+          }
+        ],
         themes: [],
         websites: [],
         images: []