extracted query parsing to a new class

app/query_parser.rb

···
+class QueryParser
+  def parse_terms(query)
+    query = query.strip.gsub('%', "\\%")
+    query.split(/ +/)
+  end
+end

app/server.rb

···
 require 'sinatra/base'
 
 require_relative 'init'
-require_relative 'models/like'
 require_relative 'models/user'
+require_relative 'query_parser'
 
 class Server < Sinatra::Application
   class PKeyCache
···
       return json_error('MissingParameter', 'Missing "collection" parameter')
     end
 
-    query = params[:query].gsub('%', "\\%")
-    words = query.strip.split(/ +/)
+    terms = QueryParser.new.parse_terms(params[:query])
 
     collection = case params[:collection]
     when 'likes'   then user.likes
···
     items = collection
       .joins(:post)
       .includes(:post => :user)
-      .matching_terms(words)
+      .matching_terms(terms)
       .reverse_chronologically
       .after_cursor(params[:cursor])
       .limit(PAGE_LIMIT)