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    1.  form_for
    <%= form_for(@article) do |f| %>
      <%= f.label :title %>
      <%= f.text_field :title %>
    <%end%>

    In this example i supplied an object of article to the form_for method.

    It will generate the following:

    <form action="/articles" class="new_article" id="new_article" method="post">
        <label for="article_title">Title</label>
        <input id="article_title" name="article[title]" type="text" />
    • text_field
    <%= f.text_field :title %>

    For text_field there must be an existing column in the database like in this case you must have a column name 'title' in the database.

    It is always used with the combination of form_for.

    •  radio_button
    <%= f.radio_button :contact_method, 'email' %> 
    <%= f.label :contact_method, 'Email', :value => 'email' %>
    

    They are generally used for small selection list.

    They are generally created as an independent object that are united together by a naming convention.

    •  check_box
    <%= check_box("notes", note.id, {checked: true}) %>

    By default it's value is set to true which means it will be checked by default.

    2. form_tag

    Syntax:

    <% form_tag(articles_path, :method=>'post', :multipart => true) do %>

    You simply defines the path to the form_tag.

    Then you define it what HTTP request to make like in this case you are making a 'post' request.

    •  text_field_tag
    <%= text_field_tag :email %>

    text_field_tag is used if we do not want to involve the database.

     

     

     

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