你需要的是input_html: {required: true}

# adds .required class to the input's enclosing <li> element - form can still be submitted
input :team, required: true   

# adds required attribute to the <input> element - form cannot be submitted
input :team, input_html: {required: true}

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这确实是一个Formtastic问题，而不是Active Admin。我不认为你可以合并allow_blank: false，include_blank: 'text'和required: true。尝试include_blank: false和hint: 'Please enter a team'。

ActiveAdmin.register Model, as: "Model" do
    Formtastic::FormBuilder.perform_browser_validations = true
    # all code
end

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Add this line to your related active_admin file

Formtastic::FormBuilder.perform_browser_validations = true

ActiveAdmin.register Model, as: "Model" do   
  Formtastic::FormBuilder.perform_browser_validations = true  
    # all code  
end

Add input_html: {required: true}  to field which you want to make it required
input :first_name, input_html: {required: true}

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