30 lines
1.2 KiB
Ruby
30 lines
1.2 KiB
Ruby
# frozen_string_literal: true
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module RuboCop
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module Cop
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# Cop that blacklists the use of ".becomes(SomeConstant)".
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#
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# The use of becomes() will result in a new object being created, throwing
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# away any eager loaded assocations. This in turn can cause N+1 query
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# problems, even when a developer eager loaded all necessary associations.
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#
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# See https://gitlab.com/gitlab-org/gitlab/-/issues/23182 for more information.
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class AvoidBecomes < RuboCop::Cop::Base
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MSG = 'Avoid the use of becomes(SomeConstant), as this creates a ' \
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'new object and throws away any eager loaded associations. ' \
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'When creating URLs in views, just use the path helpers directly. ' \
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'For example, instead of `link_to(..., [group.becomes(Namespace), ...])` ' \
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'use `link_to(..., namespace_foo_path(group, ...))`. Most of the time there is no ' \
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'need to pass in namespace to the path helpers after implementaton of ' \
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'https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/12566'
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def_node_matcher :becomes?, <<~PATTERN
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(send {send ivar lvar} :becomes ...)
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PATTERN
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def on_send(node)
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add_offense(node) if becomes?(node)
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end
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end
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end
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end
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