added a button for direct download of measurment series based on sugg…

…estion of dendrochonologist

app/controllers/dendros_controller.rb

@@ -1,3 +1,5 @@
+require 'csv'
+
 class DendrosController < ApplicationController
   include Tabulatable
   include Pagy::Backend
@@ -99,6 +101,23 @@ def destroy
       format.json { head :no_content }
     end
   end
+
+  def export_measurements_csv
+    @dendro = Dendro.find(params[:id])
+
+    csv_data = CSV.generate(headers: true) do |csv|
+      csv << ["Year", "Width (mm)"]
+      @dendro.measurements.each do |measurement|
+        csv << [measurement["year"], measurement["value"]]
+      end
+    end
+
+    file_name = "dendro_measurements_#{@dendro.series_code.parameterize}.csv"
+
+    respond_to do |format|
+      format.csv { send_data csv_data, filename: file_name }
+    end
+  end
 
   private
     # Use callbacks to share common setup or constraints between actions.

app/views/dendros/show.html.erb

@@ -62,6 +62,7 @@
         </tbody>
       </table>
     </div>
+    <%= link_to "Download as CSV", export_measurements_csv_dendro_path(@dendro, format: :csv), class: "btn btn-primary btn-sm ms-2" %>
   </section>
 
   <%# References Section %>

config/routes.rb

@@ -1,5 +1,4 @@
 Rails.application.routes.draw do
-  resources :dendros
   use_doorkeeper
 
   # Static pages
@@ -46,6 +45,12 @@
   resources :typos do
     get 'search', on: :collection
   end
+
+  resources :dendros do
+    member do
+      get :export_measurements_csv
+    end
+  end
 
   # Secondary data resources (no independent show/index views)
   resources :taxons, except: [:index, :show] do