Rails: Accessing Enum Value in View Layer

Question

I am having trouble accessing an enum value from the view layer in Rails.

I have an ActiveRecord model named Rule which has an enum operation defined:

class Rule < ActiveRecord::Base
  enum operation: [:says, :contains]
end

I have passed a rule to my view and I am trying to access the operation field. The object returns nil, despite having a value.

= rule.inspect             #=> #<Rule id: 2, operation: 1>
= rule.operation           #=> Nil
= rule.operation.class     #=> NilClass

When I attempt to access the operations field from my console, it works just fine.

rule.inspect             #=> #<Rule id: 2, operation: 1>
rule.operation           #=> "contains"

I verified that operation is not a ruby/rails keyword. Is there some trick to getting enums to show up in the view layer?

Thanks in advance!

I tried renaming the column to 'op' and that did not fix the problem. — warder57
– warder57, Commented Jul 7, 2016 at 18:12

warder57 · Accepted Answer · 2016-07-07 20:32:47Z

1

This issue was caused when I clobbered the hash which defined the enum. I did this in order to provide options for a select tag.

@operations = RowRule.operations
# alter @operations here

I solved this by cloning the hash:

@rule_operations = RowRule.operations.clone
# alter @operations here

answered Jul 7, 2016 at 20:32

warder57

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