<%= form_tag(sheets_path, :method => "get", id: "search-form") do %>
        <%= date_field :search, params[:search], placeholder: "Procurar sheets" %>
        <%= submit_tag "Procurar", :name => nil,class: "button" %>
      <% end %>

def index
    @sheets = Sheet.where(user_id: current_user)
        if params[:search]
            @sheets = Sheet.search(params[:search], current_user.id)
        else
            @sheets = Sheet.where(user_id: current_user)
        end
 end

def self.search(search, userid)
  date_start = search
  date_end = '2017-07-27T00:00:00'#hardcoded, for now, implement date_start +24h later
  self.where("user_id =" + userid.to_s ).where("inicio > ?", date_start).where("inicio < ?", date_end)
end

Processing by SheetsController#index as HTML
  Parameters: {"utf8"=>"✓", "search"=>{""2017-07-03""=>"2017-07-05"}}
  User Load (1.0ms)  EXEC sp_executesql N'SELECT  [users].* FROM [users] WHERE [users].[id] = @0  ORDER BY [users].[id] ASC OFFSET 0 ROWS FETCH NEXT @1 ROWS ONLY', N'@0 int, @1 int', @0 = 7, @1 = 1  [["id", nil], ["LIMIT", nil]]
Completed 500 Internal Server Error in 6ms (ActiveRecord: 1.0ms)



TypeError (can't quote Array):

app/models/sheet.rb:7:in `search'

<%= date_field :search, params[:search], placeholder: "Procurar sheets" %>

<%= date_field_tag(:search, Date.today)%>