Add show method to JSON API and document not found response

app/controllers/case_logs_controller.rb

@@ -33,9 +33,18 @@ class CaseLogsController < ApplicationController
     end
   end
 
-  # We don't have a dedicated non-editable show view
   def show
-    edit
+    respond_to do |format|
+        # We don't have a dedicated non-editable show view
+      format.html { edit }
+      format.json do
+        if (case_log = CaseLog.find_by(id: params[:id]))
+          render json: case_log, status: :ok
+        else
+          render json: { error: "Case Log #{params[:id]} not found" }, status: :not_found
+        end
+      end
+    end
   end
 
   def edit
@@ -90,7 +99,7 @@ class CaseLogsController < ApplicationController
 
 private
 
-  API_ACTIONS = %w[create update destroy].freeze
+  API_ACTIONS = %w[create show update destroy].freeze
 
   def question_responses(questions_for_page)
     questions_for_page.each_with_object({}) do |(question_key, question_info), result|

docs/api/DLUHC-CORE-Data.v1.json

@@ -30,7 +30,22 @@
             }
           },
           "404": {
-            "description": "Not Found"
+            "description": "Not Found",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {}
+                },
+                "examples": {
+                  "Not found": {
+                    "value": {
+                      "error": "Case Log 67 not found"
+                    }
+                  }
+                }
+              }
+            }
           }
         },
         "operationId": "get-case_logs-case_logs-:id",
@@ -70,7 +85,13 @@
                   "type": "object",
                   "properties": {}
                 },
-                "examples": {}
+                "examples": {
+                  "Not found": {
+                    "value": {
+                      "error": "Case Log 67 not found"
+                    }
+                  }
+                }
               }
             }
           },
@@ -127,7 +148,22 @@
             "description": "No Content"
           },
           "404": {
-            "description": "Not Found"
+            "description": "Not Found",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {}
+                },
+                "examples": {
+                  "Not found": {
+                    "value": {
+                      "error": "Case Log 67 not found"
+                    }
+                  }
+                }
+              }
+            }
           }
         },
         "description": "Delete a case log",

spec/requests/case_log_controller_spec.rb

@@ -99,6 +99,24 @@ RSpec.describe CaseLogsController, type: :request do
     end
   end
 
+  describe "GET" do
+    let(:case_log) { FactoryBot.create(:case_log, :completed) }
+    let(:id) { case_log.id }
+
+    before do
+      get "/case_logs/#{id}", headers: headers
+    end
+
+    it "returns http success" do
+      expect(response).to have_http_status(:success)
+    end
+
+    it "returns a serialized Case Log" do
+      json_response = JSON.parse(response.body)
+      expect(json_response["status"]).to eq(case_log.status)
+    end
+  end
+
   describe "PATCH" do
     let(:case_log) do
       FactoryBot.create(:case_log, :in_progress, tenant_code: "Old Value", property_postcode: "Old Value")