Railsのフォーム基本的な作成方法まとめ（form_forとかform_tag） ref: http://qiita.com/ykyk1218/items/2541a313aac0f0e5d81a

file0.erb

<% form_for(@article) do |f| %>
  <div><%= f.text_field :title, class: "hogehoge" %></div>
  <%= f.submit %>
<% end %>

file0.txt

<% form_for(@article) do |f| %>
  <div><%= f.text_field :title, class: "hogehoge" %></div>
  <%= f.submit %>
<% end %>

file1.erb

<% form_for([:admin, @article]) do |f| %>
<% end %>

file1.txt

<% form_for([:admin, @article]) do |f| %>
<% end %>

file2.erb

<% form_tag(:controller => article, :action => create) %>
  <div><%= text_field :title, class: "hogehoge" %></div>
  <%= submit_tag "作成" %>
<% end %>

file2.txt

<% form_tag(:controller => article, :action => create) %>
  <div><%= text_field :title, class: "hogehoge" %></div>
  <%= submit_tag "作成" %>
<% end %>

file3.erb

<%= f.text_field :title, class: "hogehoge" %>

file3.txt

<%= f.text_field :title, class: "hogehoge" %>

file4.erb

<%= f.text_area :content, class: "hogehoge", size: "100x50" %>

file4.txt

<%= f.text_area :content, class: "hogehoge", size: "100x50" %>

file5.erb

<%= f.collection_select :category, Category.all, :id, :category_name, include_blank: true %>

file5.txt

<%= f.collection_select :category, Category.all, :id, :category_name, include_blank: true %>

file6.erb

<%= f.collection_check_boxes(:article, :tag_ids, Tag.all, :id, :tag_name) do |b| %> 
  <%= b.label {b.check_box + b.text} %>
<% end %>

file6.txt

<%= f.collection_check_boxes(:article, :tag_ids, Tag.all, :id, :tag_name) do |b| %> 
  <%= b.label {b.check_box + b.text} %>
<% end %>

file7.txt

params.require(:article).permit({:tag_ids=>[]}

file8.erb

<%= f.collection_radio_buttons(:article, :type_ids, Type.all, :id, :type_name) do |b| %>
  <%= b.label {b.radio_button + b.text} %>
<% end %>

file8.txt

<%= f.collection_radio_buttons(:article, :type_ids, Type.all, :id, :type_name) do |b| %>
  <%= b.label {b.radio_button + b.text} %>
<% end %>