FIX: JSON custom fields incorrectly being converted to an array.

https://meta.discourse.org/t/custom-fields-simultaneous-save-with-json-becomes-an-array/73647

app/models/concerns/has_custom_fields.rb

@@ -161,7 +161,7 @@ module HasCustomFields
 
       array_fields = {}
 
-      _custom_fields.each do |f|
+      _custom_fields.reload.each do |f|
         if dup[f.name].is_a? Array
           # we need to collect Arrays fully before we can compare them
           if !array_fields.has_key?(f.name)
@@ -171,7 +171,7 @@ module HasCustomFields
           end
         elsif dup[f.name].is_a? Hash
           if dup[f.name].to_json != f.value
-            f.destroy
+            f.destroy!
           else
             dup.delete(f.name)
           end
@@ -180,7 +180,7 @@ module HasCustomFields
           self.class.append_custom_field(t, f.name, f.value)
 
           if dup[f.name] != t[f.name]
-            f.destroy
+            f.destroy!
           else
             dup.delete(f.name)
           end
@@ -198,11 +198,12 @@ module HasCustomFields
 
       dup.each do |k, v|
         if v.is_a? Array
-          v.each { |subv| _custom_fields.create(name: k, value: subv) }
-        elsif v.is_a? Hash
-          _custom_fields.create(name: k, value: v.to_json)
+          v.each { |subv| _custom_fields.create!(name: k, value: subv) }
         else
-          _custom_fields.create(name: k, value: v)
+          _custom_fields.create!(
+            name: k,
+            value: v.is_a?(Hash) ? v.to_json : v
+          )
         end
       end