Delete duplicate records from a 2 dimensional array in rails

Rails
1

Hello,

I am trying to insert elements into an array like this…

@mem = []@tran =
Transport.find_all_by_month_and_vehicle(date,vehicle)tran.each do |t|
@mem << [Student.find_by_id(t.mem_id), t.transport_date, vehicle.no]
if t.mem_type==“Student”
@mem << [Employee.find_by_id(t.mem_id), t.transport_date, vehicle.no]
if t.mem_type=="Employee"end

And in the view page I am looping and displaying it as

@mem.each do |m|

<%= link_to m[0].first_name} %> <%= m[0].age %> m[1] m[2] <%end%>

But I am getting duplicate entries in the table… So I neeed to remove
duplicates and display only unique values… I tries doing
@mem << [Student.find_by_id(t.mem_id), t.transport_date,
vehicle.no].uniq! if t.mem_type==“Student”… But it is not working…
Please help

2

@tran = Transport.where( date: date, vehicle: vehicle)
@mem = @tran.members

Iterate in view

@mem.each do |mem|
mem.name
mem.vehicle

Should work if you have the relations set up. You should go read one or
two tutorials about relations and how to set them up.

3

uniq can take a block as well if you wanted to unique similar arrays on
a specific element:

@mem.uniq { |mem| mem[1] }

Or even on multiple criteria:

@mem.uniq { |mem| [ mem[1], mem[2] ] }

4

Joel P. wrote in post #1121051:

uniq can take a block as well if you wanted to unique similar arrays on
a specific element:

@mem.uniq { |mem| mem[1] }

Or even on multiple criteria:

@mem.uniq { |mem| [ mem[1], mem[2] ] }

This was very helpful

Thank you

5

if you really need to do some processing that gets you an array with
duplicate entries and then clean the array at the end of it all. try
doing
something like

@mem = @mem.uniq

you can probably do @mem.uniq! but i’ve had some cases where that
didn’t
get me the results i wanted.