how to authenticate user and password using ruby on rails -

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How to authenticate user names and passwords using ruby ​​on Rail

If my authentication is correct then I need to visit some other page sample code of login.html.erb : 

   
 Hello, : Valid = & gt; Correct | f |% & gt; & Lt; TR & gt; & Lt; Td> & Lt; B & gt; Student registration no & lt; Sup> * & Lt; / Sup> & Lt; / B & gt; & Lt; / Td> & Lt; Td> & Lt;% = text_field: user ,: name, placeholder = & gt; "Reg.No"% & gt; & Lt;% = @ user.errors.on (: name)% & gt; & Lt; / TD & gt; & Lt; / TR & gt; & Lt; TR & gt; & Lt; TD & gt; & Lt; P & gt; Password & lt; / P & gt; & Lt; / TD & gt; & Lt; Td> & Lt;% = text_field: User ,: Password: Placeholder = & gt; "Password"%> & Lt;% = @ user.errors.on (: password)% & gt; & Lt; / TD & gt; & Lt; / TR & gt; & Lt; TR & gt; & Lt; Td> & Lt; B & gt; & Lt;% = submit_tag "Submit"%> & Lt; / B & gt; & Lt; / Td> & Lt; Td> & Lt; B & gt; & Lt; Input type = "reset" name = "cancel" /> gt; & Lt; / B & gt; & Lt; / Td> & Lt; / TR & gt; & Lt;% end% & gt;    
 
 
 Please refer to this video  
 Authentication from scratch == & gt;  
 or  
 Use  devise  gem for authentication

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