Prefer the optional syntax
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**SimpleForm** also allows you to use optional elements. For instance, let's suppose you want to use
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hints or placeholders, but you don't want them to be generated automatically. You can set their
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default values to `false` or use the `optional` method:
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default values to `false` or use the `optional` method. Is preferible to use the `optional` syntax:
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```ruby
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config.wrappers :placeholder => false do |b|
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end
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```
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By setting it to `false`, a placeholder will only be generated when `:placeholder => true` is
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explicitly used. The same for hint.
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By setting it as `optional`, a hint will only be generated when `:hint => true` is explicitly used.
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The same for placehold.
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## Usage
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