simple_form memo1

SimpleForm::ActionViewExtensions::FormHelper

with_simple_form_field_error_proc

        default_field_error_proc = ::ActionView::Base.field_error_proc
        begin
          ::ActionView::Base.field_error_proc = SimpleForm.field_error_proc
          yield
        ensure
          ::ActionView::Base.field_error_proc = default_field_error_proc
        end

When the yield method is commented out, it will not be rendered.

simple_form_for

...
...
        with_simple_form_field_error_proc do
          form_for(record, options, &block)
        end

When the form_for method is commented out, not be rendered.

simple_form_for is the form_for wrapper of ActionView::Helpers:: FormHelper.

definition of form_for

---

    # Example:
    #
    #   simple_form_for @user do |f|
    #     f.input :name, hint: 'My hint'
    #   end

The class of f, that is block variable ( not block argument, Proc argument) , is SimpleForm::FormBuilder.
@user class in Example is the same as f.object.

SimpleForm::FormBuilder

pry ls

ActiveSupport::ToJsonWithActiveSupportEncoder#methods: to_json
ActionView::ModelNaming#methods: convert_to_model  model_name_from_record_or_class
SimpleForm::ActionViewExtensions::Builder#methods: simple_fields_for
ActionView::Helpers::FormBuilder#methods: 
  check_box             emitted_hidden_id?         month_field     phone_field      time_select     
  collection_select     field_helpers              multipart       radio_button     time_zone_select
  color_field           field_helpers=             multipart=      range_field      to_model        
  country_select        field_helpers?             multipart?      search_field     to_partial_path 
  date_field            fields                     number_field    select           url_field       
  date_select           fields_for                 object=         submit           week_field      
  datetime_field        file_field                 object_name=    telephone_field
  datetime_local_field  grouped_collection_select  options         text_area      
  datetime_select       hidden_field               options=        text_field     
  email_field           index                      password_field  time_field     
SimpleForm::FormBuilder#methods: 
  association    collection_check_boxes    full_error   label               mappings=    template
  attribute      collection_radio_buttons  hint         lookup_action       mappings?    wrapper 
  button         error                     input        lookup_model_names  object     
  button_button  error_notification        input_field  mappings            object_name
self.methods: __pry__
instance variables: 
  @default_options  @index      @nested_child_index  @object_name  @template
  @defaults         @multipart  @object              @options      @wrapper 
locals: _  __  _dir_  _ex_  _file_  _in_  _out_  _pry_

hint

f.hint('My hint') -> "<p class=\"help-block\">My hint</p>"