Add pagination to alerts index

README.md

@@ -28,7 +28,8 @@ bin/rspec
 ## TODO
 
 - What additional cols to add to parks model?
-- Order results on parks#index
+- Order results on index actions
+- Return total pages for index actions
 - index states for efficient search?
   - full text search in sqlite?
   - normalize state on a separate table?

app/controllers/api/v1/base_controller.rb

@@ -0,0 +1,13 @@
+class Api::V1::BaseController < ApplicationController
+  DEFAULT_PAGE_SIZE = 10
+
+  private
+
+  def per_page
+    (params[:per_page].presence || DEFAULT_PAGE_SIZE).to_i
+  end
+
+  def page
+    (params[:page].presence || 1).to_i
+  end
+end

app/controllers/api/v1/parks/alerts_controller.rb

@@ -3,7 +3,7 @@ module Api::V1::Parks
     before_action :set_park
 
     def index
-      render json: @park.alerts
+      render json: @park.alerts.limit(per_page).offset((page - 1) * per_page)
     end
   end
 end

spec/fixtures/alerts.yml

@@ -0,0 +1,15 @@
+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  park_code: crla
+  title: Fire Restrictions in Effect
+  description: To ensure public safety and to provide the highest degree of protection to park resources, fire restrictions are in effect until further notice.
+  category: caution
+  indexed_date: 2025-07-04 22:07:59.0
+
+two:
+  park_code: olym
+  title: Roads May Be Icy - Please Use Caution!
+  description: Even though the sun is shining, the open roads in the park may still have icy patches, especially in the mornings and evenings when the temperatures drop. Please drive with caution.
+  category: caution
+  indexed_date: 2025-04-30 23:40:30.0

spec/models/park_spec.rb

@@ -0,0 +1,15 @@
+require 'rails_helper'
+
+RSpec.describe Park, type: :model do
+  describe "#alerts" do
+    it "has alerts" do
+      expect(parks(:one).alerts).to eq([alerts(:one)])
+    end
+
+    it "destroys dependent alerts" do
+      expect do
+        parks(:one).destroy!
+      end.to change(Alert, :count).by(-1)
+    end
+  end
+end