Add `Cell#style_str` so that we can directly return '0'

2 files changed, 6 insertions, 1 deletions

diff --git a/lib/axlsx/workbook/worksheet/cell.rb b/lib/axlsx/workbook/worksheet/cell.rb
index 4d1bae63..377307aa 100644
--- a/lib/axlsx/workbook/worksheet/cell.rb
+++ b/lib/axlsx/workbook/worksheet/cell.rb
@@ -80,6 +80,11 @@ module Axlsx
       defined?(@style) ? @style : 0
     end
 
+    # Internal
+    def style_str
+      defined?(@style) ? @style.to_s : '0'
+    end
+
     attr_accessor :raw_style
 
     # The index of the cellXfs item to be applied to this cell.
diff --git a/lib/axlsx/workbook/worksheet/cell_serializer.rb b/lib/axlsx/workbook/worksheet/cell_serializer.rb
index f45d3c73..c9bee5b0 100644
--- a/lib/axlsx/workbook/worksheet/cell_serializer.rb
+++ b/lib/axlsx/workbook/worksheet/cell_serializer.rb
@@ -12,7 +12,7 @@ module Axlsx
       def to_xml_string(row_index, column_index, cell, str = +'')
         str << '<c r="'
         str << Axlsx::col_ref(column_index) << Axlsx::row_ref(row_index)
-        str << '" s="' << cell.style.to_s << '" '
+        str << '" s="' << cell.style_str << '" '
         return str << '/>' if cell.value.nil?
 
         method = cell.type