Ruby on Rails

could you just check why the ruby script not work

it work when only use the field name : <%= land_area_unit -%>

because the the field display not right, when its sqm, it show M2 I want
it show m², that's why I want to write a if statement to showing the
right unit format:

<%= if land_area_unit == M2 %>m&sup2 <% else %> <%= if land_area_unit
== HA %>Ha <% else %><%= if land_area_unit == AC %>Ac<% else %>f&sup2

Thanks!

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