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row = CSV::Row.new(%w{A B C A A}, %w{1 2 3 4 5}) row.field("A", 4) # => "5" row.field("A", 5) # => nil row.field("A", 6) # => NoMethodError: undefined method `assoc' for nil:NilClass

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field('A', 6) !! NoMethodError: undefined method `assoc' for nil:NilClass row['A', 6] !! NoMethodError: undefined method `assoc' for nil:NilClass index('A', 6) !! NoMethodError: undefined method `index' for nil:NilClass values_at(['A',6]) !! NoMethodError: undefined method `assoc' for nil:NilClass field('A', -99) !! NoMethodError: undefined method `assoc' for nil:NilClass 

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pair = @row[minimum_index..-1].public_send(finder, header_or_index)

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index = headers[minimum_index..-1].index(header)

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What Good Looks Like Returns nil if the header does not exist.
— lib/csv/row.rb:202 Coming Soon Brand

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— lib/csv/row.rb:184 How To Write A Good Blog

Pre Qualify Credit Cards For Bad Credit and the neighbouring offset already behaves that way: on a 5-field row, field("A", 5) returns nil. Offset 6 returning nil is the only self-consistent reading. Doula Brochure

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assert_equal(nil, @row.field("A", 4)) assert_equal(nil, @row.field("A", 5))

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Reading Journal Books To Read List Guard the slice at both sites. Assertions added to the existing test_field block for offset 6, a far-past offset, and the #[] / #index / #values_at paths. Bank Of America Family Banking

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Best Credit Card For Poor To Fair Credit Reverting only lib/csv/row.rb and keeping the new assertions fails with NoMethodError: undefined method 'assoc' for nil:NilClass, so they exercise this bug rather than #field in general. Credit Card On File Template

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Product Manufacturing Launch Plan Template I found it by checking documented contracts against behaviour, not from a production incident. I also went looking for a natural way to reach it before answering you, and did not find a convincing one — ragged CSV does not do it, because CSV.parse pads short rows to the header count, so offsets stay in range: How To Put A Link In LinkedIn Post

long = ["1", "2", "3", "4", "5"] short = ["1", "2", nil, nil, nil] short.field("A", 4) = nil 

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field("A", 5) => nil field("A", 6) !! NoMethodError: undefined method `assoc' for nil:NilClass row["A", 6] !! NoMethodError: undefined method `assoc' for nil:NilClass index("A", 6) !! NoMethodError: undefined method `index' for nil:NilClass values_at(["A",6]) !! NoMethodError: undefined method `assoc' for nil:NilClass field("A", -99) !! NoMethodError: undefined method `assoc' for nil:NilClass field("Z") => nil 

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1. Offset 5 returns nil and offset 6 raises. If out-of-range offsets are meant to be the caller's error, then 5 should raise too — the current line is drawn by Array#[start..-1] returning [] at exactly length and nil past it, not by any decision in row.rb.
2. undefined method assoc' for nil:NilClasstells the caller nothing about what they did. If the answer is "that's a caller bug", anArgumentErrornaming the offset would say so;nil` is just the option that matches what the docs already promise and costs no new behaviour.

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