Do not save error json in database

app/controllers/champs/carte_controller.rb

@@ -30,6 +30,8 @@ class Champs::CarteController < ApplicationController
 
     if geo_json.first == ["error", "TooManyPolygons"]
       @error = true
+      @champ.value = nil
+      @champ.geo_areas = []
     elsif geo_json.present?
       if @champ.cadastres?
         cadastres = ModuleApiCartoService.generate_cadastre(geo_json)
@@ -54,13 +56,13 @@ class Champs::CarteController < ApplicationController
           parcelle_agricole
         end
       end
-    end
 
       @champ.geo_areas = geo_areas.map do |geo_area|
         GeoArea.new(geo_area)
       end
 
       @champ.value = geo_json.to_json
+    end
 
     if @champ.persisted?
       @champ.save

spec/controllers/champs/carte_controller_spec.rb

@@ -15,10 +15,11 @@ describe Champs::CarteController, type: :controller do
       champ_id: champ.id
     }
   end
+  let(:geojson) { [] }
   let(:champ) do
     create(:type_de_champ_carte, options: {
       quartiers_prioritaires: true
-    }).champ.create(dossier: dossier)
+    }).champ.create(dossier: dossier, value: geojson.to_json)
   end
 
   describe 'POST #show' do
@@ -46,5 +47,15 @@ describe Champs::CarteController, type: :controller do
       it { expect(response.body).to include('MultiPolygon') }
       it { expect(response.body).to include('[2.38715792094576,48.8723062632126]') }
     end
+
+    context 'when error' do
+      let(:geojson) { [[{ "lat": 48.87442541960633, "lng": 2.3859214782714844 }, { "lat": 48.87273183590832, "lng": 2.3850631713867183 }, { "lat": 48.87081237174292, "lng": 2.3809432983398438 }, { "lat": 48.8712640169951, "lng": 2.377510070800781 }, { "lat": 48.87510283703279, "lng": 2.3778533935546875 }, { "lat": 48.87544154230615, "lng": 2.382831573486328 }, { "lat": 48.87442541960633, "lng": 2.3859214782714844 }]] }
+      let(:selection) { { error: "TooManyPolygons" } }
+
+      it {
+        expect(champ.reload.value).to eq(nil)
+        expect(champ.reload.geo_areas).to eq([])
+      }
+    end
   end
 end