Adding a new field to Rails model

Question

I already created a scafold using

rails generate scaffold myOdb2 columna:integer, columnB:string

now I want to add columnc:string

Answer 1

no one mentioned updating strong parameters :

So , let us say I have an existing scaffold called myapp and I want to add more fields to that scaffold . Three things to be done .

The field to be added are :

=>

1) rails g migration add_term_count_and_current_record_count_and_previous_record_count_to_myapp term_count:integer , current_record_count:integer , previous_record_count:integer

=>

2) Update views, example updating _form.html.rb

I needed to add :

    <%= f.label :current_record_count %>

    <%= f.number_field :current_record_count%>
  

 

    <%= f.label :current_record_count %>

    <%= f.number_field :previouse_record_count%>
  

  

    <%= f.label :term_count  %>

    <%= f.number_field :terminations_count %>
  

=>

3) Update Controller : 

New versions of rails has what is called strong parameter to prevent hackers from passing arbitrary column field values. Long story short , update the method with the new fields names , otherwise you will not see the new fields.. they wont get passed to anywhere...untrusted values ;o)

 # Never trust parameters from the scary internet, only allow the white list through.

def vendor_file_params
    params.require(:vendor_file).permit(:name, :run_date,  :term_count ,
    :current_record_count , :previous_record_count ,:comments)   
end
end