Rails-Delegate.md

Pattern: Missing use of delegate

Issue: -

Description

This rule looks for delegations that could have been created automatically with the delegate method.

Safe navigation &. is ignored because Rails' allow_nil option checks not just for nil but also delegates if nil responds to the delegated method.

The EnforceForPrefixed option (defaulted to true) means that using the target object as a prefix of the method name without using the delegate method will be a violation. When set to false, this case is legal.

Examples

# bad
def bar
  foo.bar
end

# good
delegate :bar, to: :foo

# good
def bar
  foo&.bar
end

# good
private
def bar
  foo.bar
end

# EnforceForPrefixed: true
# bad
def foo_bar
  foo.bar
end

# good
delegate :bar, to: :foo, prefix: true

# EnforceForPrefixed: false
# good
def foo_bar
  foo.bar
end

# good
delegate :bar, to: :foo, prefix: true

Default configuration

Attribute	Value
EnforceForPrefixed	true

Further Reading

• RuboCop - Rails/Delegate