update last modifier.xml

<?xml version="1.0" encoding="UTF-8"?>
<custom-workflow>
  <after-destroy></after-destroy>
  <after-save></after-save>
  <author>Voronyuk.M@3soft.ru</author>
  <before-destroy></before-destroy>
  <before-save>
def update_custom_fields(issue, fields)

    f_id = Hash.new { |hash, key| hash[key] = nil }
    issue.available_custom_fields.each_with_index.map { |f,indx| f_id[f.name] = f.id }
    field_list = []
    fields.each do |name, value|
      field_id = f_id[name].to_s
      field_list &lt;&lt; Hash[field_id, value]
    end
    issue.custom_field_values = field_list.reduce({},:merge)
end

begin
user_id = @current_journal.user_id
rescue
user_id = ''
end

#no journal - this is a creation
if user_id == '' &amp;&amp; @issue.journals.count == 0
begin
user_id = @issue.author_id
rescue
user_id = ''
end
end

if user_id != ''
    fields = {"last_modifier" =&gt; user_id.to_s}
end

#raise WorkflowError, "!!! 1) " + user.to_yaml
#raise WorkflowError, "!!! 1) " + @issue.to_yaml

update_custom_fields(@issue, fields)
#raise WorkflowError, "!!! 1) " + fields.to_s + "!!! 1a) " + "!!! 2) " + " available fields \n" + @issue.available_custom_fields.to_s + "!!! 3) " + @issue.custom_field_values.to_s + "!!! 4) " + @issue.available_custom_fields.each_with_index.to_s
</before-save>
  <description></description>
  <name>update last modifier</name>
  <observable>issue</observable>
  <exported-at>2017-06-04T22:35:15Z</exported-at>
  <plugin-version>0.1.6</plugin-version>
  <ruby-version>2.0.0-p643</ruby-version>
  <rails-version>3.2.17</rails-version>
</custom-workflow>