scala - How to return only if a condition is true? -

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I still have scala and functional programming hanging.

I am trying to implement an authentication method, but I want to return only if the password matches hash and I am not sure how to do it.

Please forgive the code below, I still have my head functional. Hopefully, I have clarified what I want to do. I only want to return one result, if and only if passwords match the password provided, I want to do nothing to do this met. 

  Def authentication (name: string, password: string): option [member] = {db. Connection with {inserted c = & gt; SQL ("Select from member, where less (username) = {member name}"). ('Username' -> name.low lowercase ()) .as (member.member single opt) if (BCRT.CCPA (password, member .member.password)) {member. I am using singleframe and I am playing PlayFramework and Anorm. But, I think this is more of a normal Scala question.   
 
 
 as  (member member .singleOpt)  a  Option [member]  returns. You can  filter  a  option  like any archive, which will allow you to filter a user with bad credentials. 
 
  Def proof (name: string, password: string): option [member] = {DB.withConnection {implicit c = & gt; SQL ("Select from member, where short (username) = {username}"). ('Username - & gt; name. Lower lower case) .as (member .member single opatt). Internal function of filter (member = & gt; BCrypt Checkpw (password, member.password))}}  
 
  filter  will be called only if  The member is found . If  BCrypt.checkpw (password, member password)  is incorrect, then  some (member)  will be  none , therefore  certified Do <

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