rename parameter/update code doc

it is actually expected to be an array...

app/models/query.rb

@@ -496,24 +496,24 @@ class Query < ActiveRecord::Base
     matchdata.nil? ? nil : matchdata[:id]
   end
 
-  # Helper method to generate the WHERE sql for a +field+, +operator+ and a +value+
-  def sql_for_field(field, operator, value, db_table, db_field, is_custom_filter = false)
+  # Helper method to generate the WHERE sql for a +field+, +operator+ and a +values+ array
+  def sql_for_field(field, operator, values, db_table, db_field, is_custom_filter = false)
     sql = ''
     case operator
     when '='
-      if value.present?
-        if value.include?('-1')
+      if values.present?
+        if values.include?('-1')
           sql = "#{db_table}.#{db_field} IS NULL OR "
         end
 
-        sql += "#{db_table}.#{db_field} IN (" + value.map { |val| "'#{connection.quote_string(val)}'" }.join(',') + ')'
+        sql += "#{db_table}.#{db_field} IN (" + values.map { |val| "'#{connection.quote_string(val)}'" }.join(',') + ')'
       else
         # empty set of allowed values produces no result
         sql = '0=1'
       end
     when '!'
-      if value.present?
-        sql = "(#{db_table}.#{db_field} IS NULL OR #{db_table}.#{db_field} NOT IN (" + value.map { |val| "'#{connection.quote_string(val)}'" }.join(',') + '))'
+      if values.present?
+        sql = "(#{db_table}.#{db_field} IS NULL OR #{db_table}.#{db_field} NOT IN (" + values.map { |val| "'#{connection.quote_string(val)}'" }.join(',') + '))'
       else
         # empty set of forbidden values allows all results
         sql = '1=1'
@@ -526,32 +526,32 @@ class Query < ActiveRecord::Base
       sql << " AND #{db_table}.#{db_field} <> ''" if is_custom_filter
     when '>='
       if is_custom_filter
-        sql = "#{db_table}.#{db_field} != '' AND CAST(#{db_table}.#{db_field} AS decimal(60,4)) >= #{value.first.to_f}"
+        sql = "#{db_table}.#{db_field} != '' AND CAST(#{db_table}.#{db_field} AS decimal(60,4)) >= #{values.first.to_f}"
       else
-        sql = "#{db_table}.#{db_field} >= #{value.first.to_f}"
+        sql = "#{db_table}.#{db_field} >= #{values.first.to_f}"
       end
     when '<='
       if is_custom_filter
-        sql = "#{db_table}.#{db_field} != '' AND CAST(#{db_table}.#{db_field} AS decimal(60,4)) <= #{value.first.to_f}"
+        sql = "#{db_table}.#{db_field} != '' AND CAST(#{db_table}.#{db_field} AS decimal(60,4)) <= #{values.first.to_f}"
       else
-        sql = "#{db_table}.#{db_field} <= #{value.first.to_f}"
+        sql = "#{db_table}.#{db_field} <= #{values.first.to_f}"
       end
     when 'o'
       sql = "#{Status.table_name}.is_closed=#{connection.quoted_false}" if field == 'status_id'
     when 'c'
       sql = "#{Status.table_name}.is_closed=#{connection.quoted_true}" if field == 'status_id'
     when '>t-'
-      sql = date_range_clause(db_table, db_field, - value.first.to_i, 0)
+      sql = date_range_clause(db_table, db_field, - values.first.to_i, 0)
     when '<t-'
-      sql = date_range_clause(db_table, db_field, nil, - value.first.to_i)
+      sql = date_range_clause(db_table, db_field, nil, - values.first.to_i)
     when 't-'
-      sql = date_range_clause(db_table, db_field, - value.first.to_i, - value.first.to_i)
+      sql = date_range_clause(db_table, db_field, - values.first.to_i, - values.first.to_i)
     when '>t+'
-      sql = date_range_clause(db_table, db_field, value.first.to_i, nil)
+      sql = date_range_clause(db_table, db_field, values.first.to_i, nil)
     when '<t+'
-      sql = date_range_clause(db_table, db_field, 0, value.first.to_i)
+      sql = date_range_clause(db_table, db_field, 0, values.first.to_i)
     when 't+'
-      sql = date_range_clause(db_table, db_field, value.first.to_i, value.first.to_i)
+      sql = date_range_clause(db_table, db_field, values.first.to_i, values.first.to_i)
     when 't'
       sql = date_range_clause(db_table, db_field, 0, 0)
     when 'w'
@@ -562,9 +562,9 @@ class Query < ActiveRecord::Base
         Time.now.at_beginning_of_week
       sql = "#{db_table}.#{db_field} BETWEEN '%s' AND '%s'" % [connection.quoted_date(from), connection.quoted_date(from + 7.days)]
     when '~'
-      sql = "LOWER(#{db_table}.#{db_field}) LIKE '%#{connection.quote_string(value.first.to_s.downcase)}%'"
+      sql = "LOWER(#{db_table}.#{db_field}) LIKE '%#{connection.quote_string(values.first.to_s.downcase)}%'"
     when '!~'
-      sql = "LOWER(#{db_table}.#{db_field}) NOT LIKE '%#{connection.quote_string(value.first.to_s.downcase)}%'"
+      sql = "LOWER(#{db_table}.#{db_field}) NOT LIKE '%#{connection.quote_string(values.first.to_s.downcase)}%'"
     end
 
     sql