How can I get unique values from column in the table? For example, I have this Products table:
ID NAME CATEGORY
1 name1 1st_cat
2 name2 2nd_cat
3 name3 1st_cat
Here I want to get only 2 values - 1st_cat and 2nd_cat:
<%Products.each do |p|%>
<%=p.category%>
<%end%>