Merge pull request #8872 from tchak/fix-champ-multiselect

fix(dossier): selecting blank option should not empty selection

app/models/champs/multiple_drop_down_list_champ.rb

@@ -98,7 +98,7 @@ class Champs::MultipleDropDownListChamp < Champ
   end
 
   def value=(value)
-    return super(nil) if value.blank?
+    return super(nil) if value.nil?
 
     values = if value.is_a?(Array)
       value

spec/models/champs/multiple_drop_down_list_champ_spec.rb

@@ -32,6 +32,23 @@ describe Champs::MultipleDropDownListChamp do
 
         it { is_expected.not_to be_valid }
       end
+
+      context 'set value' do
+        it {
+          subject.value = ["val1"]
+          expect(subject.value).to eq("[\"val1\"]")
+          subject.value = 'val2'
+          expect(subject.value).to eq("[\"val1\",\"val2\"]")
+          subject.value = ''
+          expect(subject.value).to eq("[\"val1\",\"val2\"]")
+          subject.value = nil
+          expect(subject.value).to be_nil
+          subject.value = ["val1"]
+          expect(subject.value).to eq("[\"val1\"]")
+          subject.value = []
+          expect(subject.value).to be_nil
+        }
+      end
     end
   end