Setting simple_form 3.x to work with bootstrap 3.x

simple_form_3.x_bootstrap_3.x

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# app/helpers/application_helper.rb
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def horizontal_simple_form_for(record, options={}, &block)
  options[:html] ||= {}
  options[:html][:class] = "form-horizontal #{options[:html][:class]}".rstrip
  options[:wrapper] = :bootstrap_horizontal
  simple_form_for(record, options, &block)
end
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# app/inputs/bootstrap_boolean_input.rb
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class BootstrapBooleanInput < SimpleForm::Inputs::BooleanInput
  def input
    build_hidden_field_for_checkbox +
      template.content_tag(:div, class: "checkbox") {
        template.label_tag(nil) {
          build_check_box_without_hidden_field + label_text
        }
      }
  end

  def label_input
    input
  end

  def input_html_classes
    classes = super
    classes.delete('form-control')
    classes
  end
end
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# app/views/devise/sessions/new.html.erb
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<%= simple_form_for(resource, as: resource_name, url: session_path(resource_name)) do |f| %>
  <div class="form-inputs">
    <%= f.input :email, required: false, autofocus: true %>
    <%= f.input :password, required: false %>
    <%= f.input :remember_me, as: :bootstrap_boolean, wrapper: :bootstrap_boolean if devise_mapping.rememberable? %>
  </div>

  <div class="form-actions form-group">
    <%= f.button :submit, "Sign in" %>
  </div>
<% end %>
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# horizontal version
<%= horizontal_simple_form_for(resource, as: resource_name, url: session_path(resource_name)) do |f| %>
  <div class="form-inputs">
    <%= f.input :email, required: false, autofocus: true %>
    <%= f.input :password, required: false %>
    <%= f.input :remember_me, as: :bootstrap_boolean, wrapper: :bootstrap_boolean_horizontal if devise_mapping.rememberable? %>
  </div>

  <div class="form-actions form-group">
    <div class="col-sm-offset-2 col-sm-10">
      <%= f.button :submit, "Sign in" %>
    </div>
  </div>
<% end %>
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# config/initializers/simple_form.rb
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# Use this setup block to configure all options available in SimpleForm.
SimpleForm.setup do |config|
  # Wrappers are used by the form builder to generate a
  # complete input. You can remove any component from the
  # wrapper, change the order or even add your own to the
  # stack. The options given below are used to wrap the
  # whole input.
  config.wrappers :default, class: :input,
    hint_class: :field_with_hint, error_class: :field_with_errors do |b|
    ## Extensions enabled by default
    # Any of these extensions can be disabled for a
    # given input by passing: `f.input EXTENSION_NAME => false`.
    # You can make any of these extensions optional by
    # renaming `b.use` to `b.optional`.

    # Determines whether to use HTML5 (:email, :url, ...)
    # and required attributes
    b.use :html5

    # Calculates placeholders automatically from I18n
    # You can also pass a string as f.input placeholder: "Placeholder"
    b.use :placeholder

    ## Optional extensions
    # They are disabled unless you pass `f.input EXTENSION_NAME => :lookup`
    # to the input. If so, they will retrieve the values from the model
    # if any exists. If you want to enable the lookup for any of those
    # extensions by default, you can change `b.optional` to `b.use`.

    # Calculates maxlength from length validations for string inputs
    b.optional :maxlength

    # Calculates pattern from format validations for string inputs
    b.optional :pattern

    # Calculates min and max from length validations for numeric inputs
    b.optional :min_max

    # Calculates readonly automatically from readonly attributes
    b.optional :readonly

    ## Inputs
    b.use :label_input
    b.use :hint,  wrap_with: { tag: :span, class: :hint }
    b.use :error, wrap_with: { tag: :span, class: :error }
  end

  # The default wrapper to be used by the FormBuilder.
  config.default_wrapper = :default

  # Define the way to render check boxes / radio buttons with labels.
  # Defaults to :nested for bootstrap config.
  #   inline: input + label
  #   nested: label > input
  config.boolean_style = :nested

  # Default class for buttons
  config.button_class = 'btn btn-default'

  # Method used to tidy up errors. Specify any Rails Array method.
  # :first lists the first message for each field.
  # Use :to_sentence to list all errors for each field.
  # config.error_method = :first

  # Default tag used for error notification helper.
  config.error_notification_tag = :div

  # CSS class to add for error notification helper.
  config.error_notification_class = 'alert alert-error'

  # ID to add for error notification helper.
  # config.error_notification_id = nil

  # Series of attempts to detect a default label method for collection.
  # config.collection_label_methods = [ :to_label, :name, :title, :to_s ]

  # Series of attempts to detect a default value method for collection.
  # config.collection_value_methods = [ :id, :to_s ]

  # You can wrap a collection of radio/check boxes in a pre-defined tag, defaulting to none.
  # config.collection_wrapper_tag = nil

  # You can define the class to use on all collection wrappers. Defaulting to none.
  # config.collection_wrapper_class = nil

  # You can wrap each item in a collection of radio/check boxes with a tag,
  # defaulting to :span. Please note that when using :boolean_style = :nested,
  # SimpleForm will force this option to be a label.
  # config.item_wrapper_tag = :span

  # You can define a class to use in all item wrappers. Defaulting to none.
  # config.item_wrapper_class = nil

  # How the label text should be generated altogether with the required text.
  # config.label_text = lambda { |label, required| "#{required} #{label}" }
  config.label_text = lambda { |label, required| " #{label} #{required}" }

  # You can define the class to use on all labels. Default is nil.
  # config.label_class = ''

  # You can define the class to use on all forms. Default is simple_form.
  config.form_class = :simple_form

  # You can define which elements should obtain additional classes
  # config.generate_additional_classes_for = [:wrapper, :label, :input]

  # Whether attributes are required by default (or not). Default is true.
  # config.required_by_default = true

  # Tell browsers whether to use the native HTML5 validations (novalidate form option).
  # These validations are enabled in SimpleForm's internal config but disabled by default
  # in this configuration, which is recommended due to some quirks from different browsers.
  # To stop SimpleForm from generating the novalidate option, enabling the HTML5 validations,
  # change this configuration to true.
  config.browser_validations = false

  # Collection of methods to detect if a file type was given.
  # config.file_methods = [ :mounted_as, :file?, :public_filename ]

  # Custom mappings for input types. This should be a hash containing a regexp
  # to match as key, and the input type that will be used when the field name
  # matches the regexp as value.
  # config.input_mappings = { /count/ => :integer }

  # Custom wrappers for input types. This should be a hash containing an input
  # type as key and the wrapper that will be used for all inputs with specified type.
  # config.wrapper_mappings = { string: :prepend }

  # Default priority for time_zone inputs.
  # config.time_zone_priority = nil

  # Default priority for country inputs.
  # config.country_priority = nil

  # When false, do not use translations for labels.
  # config.translate_labels = true

  # Automatically discover new inputs in Rails' autoload path.
  # config.inputs_discovery = true

  # Cache SimpleForm inputs discovery
  # config.cache_discovery = !Rails.env.development?

  # Default class for inputs
  # config.input_class = nil
  config.input_class = 'form-control'
end
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# config/initializers/simple_form_bootstrap.rb
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# Use this setup block to configure all options available in SimpleForm.
SimpleForm.setup do |config|
  config.wrappers :bootstrap, tag: 'div', class: 'control-group form-group', error_class: 'has-error' do |b|
    b.use :html5
    b.use :placeholder
    b.use :label
    b.wrapper tag: 'div', class: 'controls' do |ba|
      ba.use :input
      ba.use :error, wrap_with: { tag: 'span', class: 'help-inline' }
      ba.use :hint,  wrap_with: { tag: 'p', class: 'help-block' }
    end
  end

  config.wrappers :bootstrap_boolean, tag: 'div', class: 'control-group form-group', error_class: 'has-error' do |b|
    b.use :html5
    b.wrapper tag: 'div', class: 'controls' do |ba|
      ba.use :input
      ba.use :error, wrap_with: { tag: 'span', class: 'help-inline' }
      ba.use :hint,  wrap_with: { tag: 'p', class: 'help-block' }
    end
  end

  config.wrappers :bootstrap_group, tag: 'div', class: "control-group form-group", error_class: 'has-error' do |b|
    b.use :html5
    b.use :placeholder
    b.use :label
    b.wrapper tag: 'div', class: 'controls' do |input|
      input.wrapper tag: 'div', class: 'input-group' do |item|
        item.use :input
      end
      input.use :hint,  wrap_with: { tag: 'span', class: 'help-block' }
      input.use :error, wrap_with: { tag: 'span', class: 'help-inline' }
    end
  end

  config.wrappers :bootstrap_horizontal, tag: 'div', class: 'control-group form-group', error_class: 'has-error' do |b|
    b.use :html5
    b.use :placeholder
    b.use :label, wrap_with: { tag: 'div', class: 'control-label col-sm-2' }
    b.wrapper tag: 'div', class: 'controls col-sm-10' do |ba|
      ba.use :input
      ba.use :error, wrap_with: { tag: 'span', class: 'help-inline' }
      ba.use :hint,  wrap_with: { tag: 'p', class: 'help-block' }
    end
  end

  config.wrappers :bootstrap_boolean_horizontal, tag: 'div', class: 'control-group form-group', error_class: 'has-error' do |b|
    b.use :html5
    b.wrapper tag: 'div', class: 'controls col-sm-offset-2 col-sm-10' do |ba|
      ba.use :input
      ba.use :error, wrap_with: { tag: 'span', class: 'help-inline' }
      ba.use :hint,  wrap_with: { tag: 'p', class: 'help-block' }
    end
  end

  config.wrappers :bootstrap_group_horizontal, tag: 'div', class: "control-group form-group", error_class: 'has-error' do |b|
    b.use :html5
    b.use :placeholder
    b.use :label, wrap_with: { tag: 'div', class: 'control-label col-sm-2' }
    b.wrapper tag: 'div', class: 'controls col-sm-10' do |input|
      input.wrapper tag: 'div', class: 'input-group' do |item|
        item.use :input
      end
      input.use :hint,  wrap_with: { tag: 'span', class: 'help-block' }
      input.use :error, wrap_with: { tag: 'span', class: 'help-inline' }
    end
  end

  # Wrappers for forms and inputs using the Twitter Bootstrap toolkit.
  # Check the Bootstrap docs (http://twitter.github.com/bootstrap)
  # to learn about the different styles for forms and inputs,
  # buttons and other elements.
  config.default_wrapper = :bootstrap
end
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