Answer by puneet18 for Display related records, if they exist, in Rails view

Using try method of ruby, exception will not be raised and nil will be returned instead, if the receiving object is a nil object.

Try below code in view:

# view code<% @device_vendors.each do |device_vendor| %><% device = Device.where(abbr: device_vendor.device).first %><% vendor = Vendor.where(abbr: device_vendor.vendor).first %><tr><td><%= device.try(:name) %></td><td><%= vendor.try(:name) %></td><td><%= link_to 'Show', device_vendor %></td><td><%= link_to 'Edit', edit_device_vendor_path(device_vendor) %></td></tr><% end %>

OR correct way is to add association

Device has_many_and_belongs_to VendorVendor has_many_and_belongs_to Device

DeviceVendor is Join table of Device and Vendor