form.html

<form accept-charset="UTF-8" action="/companies/12" class="l-inline" data-remote="true" method="post" novalidate="novalidate">
    
    <div class="fields">
        <div class="row">
            <!-- Here goes the input -->
        </div>
    </div>
</form>

form.html.slim

= formidable_for(@company, html: {:class => 'l-inline'}, remote: true) do |f|
  
  = f.simple_fields_for :posts, wrapper_html: 'row' do |iv|

    div class="row"
      = iv.input :title

simple_form.rb

# 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 => :field,
    :hint_class => "s-hint", :error_class => "s-error" 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
    b.wrapper :my_wrapper, :tag => :div, :class => 'editor' do |component|
      component.use :input
    end
    # b.use :label_input
    b.use :hint,  :wrap_with => { :tag => :span, :class => "field-message field-hint" }
    b.use :error, :wrap_with => { :tag => :span, :class => "field-message field-error" }
  end

  config.wrappers :single_checkbox, :class=> "field l-single", :hint_class => "s-hint", :error_class => "s-error" do |b|
    b.use :html5
    b.optional :readonly

    b.wrapper :my_wrapper, :tag => :div, :class => 'editor' do |component|
      component.use :input
    end
    b.use :label
    b.use :hint,  :wrap_with => { :tag => :span, :class => "field-message field-hint" }
    b.use :error, :wrap_with => { :tag => :span, :class => "field-message field-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 = 'button'

  # Method used to tidy up errors.
  # 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. Default "#{required} #{label}"
  config.label_text = lambda { |label, required| "#{label}" }

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

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

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

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

  # Tell browsers whether to use default HTML5 validations (novalidate option).
  # Default is enabled.
  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 }

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

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

  # Default size for text inputs.
  # config.default_input_size = 50

  # 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?
end