非常好用的模糊查询gem：ransack

https://github.com/activerecord-hackery/ransack

添加Gemfile

gem 'ransack'

view中代码

<%= form_tag products_path, method: :get, class: "navbar-form navbar-left" do %>
<div class="form-group">
<%= search_field_tag("q[name_cont]", params["q"] && params["q"]["name_cont"],
class:"form-control input-sm search-form", placeholder: "输入商品名称")%>
</div>
<% end %>


controller里

def index
@q = Product.ransack(params[:q])
@products = @q.result(distinct: true)
end

其中 name_cont会对name字段进行模糊查询