fix rubycop issue:

- don't introduce global variable
 - don't prefix getter with get_
 - single quotes instead of doubles for hash usage

app/controllers/crawlers/courses_crawler_controller.rb

@@ -4,7 +4,7 @@ class Crawlers::CoursesCrawlerController < Crawlers::TissCrawlerController
     params[:api] = '/api/search/course/v1.0/quickSearch'
     params[:search_parameter] = 'searchterm'
     puts params[:search_context]
-    @host = TissCrawler.get_host
+    @host = TissCrawler.host
 
     # TissCrawler performs general search over the available courses
     @courses = TissCrawler.search(params)
@@ -46,7 +46,7 @@ class Crawlers::CoursesCrawlerController < Crawlers::TissCrawlerController
     end
 
     # Host is needed for image rendering
-    @host = TissCrawler.get_host
+    @host = TissCrawler.host
   end
 
   def add_to_fav

app/controllers/crawlers/people_crawler_controller.rb

@@ -4,7 +4,7 @@ class Crawlers::PeopleCrawlerController < Crawlers::TissCrawlerController
     params[:api] = '/api/person/v22/psuche'
     params[:search_parameter] = 'q'
     puts params[:search_context]
-    @host = TissCrawler.get_host
+    @host = TissCrawler.host
 
     # TissCrawler performs general search over the available people
     @people = TissCrawler.search(params)
@@ -18,7 +18,7 @@ class Crawlers::PeopleCrawlerController < Crawlers::TissCrawlerController
     # TissCrawler fetches the person's detail information
     @person = TissCrawler.get_details(params)
     # Host is needed for image rendering
-    @host = TissCrawler.get_host
+    @host = TissCrawler.host
   end
 
   def add_to_fav

app/controllers/crawlers/projects_crawler_controller.rb

@@ -3,7 +3,7 @@ class Crawlers::ProjectsCrawlerController < Crawlers::TissCrawlerController
     params[:api] = '/api/search/projectFullSearch/v1.0/projects'
     params[:search_parameter] = 'searchterm'
     puts params[:search_context]
-    @host = TissCrawler.get_host
+    @host = TissCrawler.host
 
     # TissCrawler performs general search over the available projects
     @projects = TissCrawler.search(params)
@@ -18,7 +18,7 @@ class Crawlers::ProjectsCrawlerController < Crawlers::TissCrawlerController
     # TissCrawler fetches the project's detail information
     @project = TissCrawler.get_project_details(params)
     # Host is needed for image rendering
-    @host = TissCrawler.get_host
+    @host = TissCrawler.host
   end
 
   def add_to_fav

app/controllers/crawlers/theses_crawler_controller.rb

@@ -3,7 +3,7 @@ class Crawlers::ThesesCrawlerController < Crawlers::TissCrawlerController
     params[:api] = '/api/search/thesis/v1.0/quickSearch'
     params[:search_parameter] = 'searchterm'
     puts params[:search_context]
-    @host = TissCrawler.get_host
+    @host = TissCrawler.host
 
     # TissCrawler performs general search over the available theses
     @theses = TissCrawler.search(params)
@@ -18,7 +18,7 @@ class Crawlers::ThesesCrawlerController < Crawlers::TissCrawlerController
     # TissCrawler fetches the thesis' detail information
     @thesis = TissCrawler.get_thesis_details(params)
     # Host is needed for image rendering
-    @host = TissCrawler.get_host
+    @host = TissCrawler.host
   end
 
   def add_to_fav

lib/tiss/tiss_crawler.rb

@@ -1,24 +1,25 @@
 class TissCrawler
-
   require 'httparty'
 
-  $host = 'https://tiss.tuwien.ac.at'
+  def self.host
+    'https://tiss.tuwien.ac.at'
+  end
 
   def self.search(params)
     api = params[:api]
     search_parameter = params[:search_parameter]
     search_term = params[:search_term].parameterize(separator: '+')
-    url = $host + api + '?' + search_parameter + '=' + search_term
+    url = host + api + '?' + search_parameter + '=' + search_term
     puts(url)
 
     response = HTTParty.get(url)
-    JSON.parse(response.body)["results"]
+    JSON.parse(response.body)['results']
   end
 
   def self.get_details(params)
     api = params[:api]
     id = params[:tiss_id]
-    url = $host + api + id
+    url = host + api + id
     puts(url)
 
     response = HTTParty.get(url)
@@ -29,7 +30,7 @@ class TissCrawler
     api = params[:api]
     number = params[:number]
     semester = params[:semester]
-    url = $host + api + number + '-' + semester
+    url = host + api + number + '-' + semester
     puts(url)
 
     response = HTTParty.get(url)
@@ -39,7 +40,7 @@ class TissCrawler
   def self.get_thesis_details(params)
     api = params[:api]
     id = params[:id]
-    url = $host + api + id
+    url = host + api + id
     puts(url)
 
     response = HTTParty.get(url)
@@ -49,26 +50,24 @@ class TissCrawler
   def self.get_project_details(params)
     api = params[:api]
     id = params[:id]
-    url = $host + api + id
+    url = host + api + id
     puts(url)
 
     response = HTTParty.get(url)
     response.parsed_response['tuVienna']['project']
   end
 
-  def self.get_host
-    $host
-  end
-
   def self.get_oid_name(item)
     # Fetches a person's name based on the org id
     # Example: https://tiss.tuwien.ac.at/api/person/v22/oid/250197
     api = '/api/person/v22/oid/'
-    url = $host + api + item
+    url = host + api + item
     puts(url)
 
     response = HTTParty.get(url)
-    response.parsed_response['first_name'] + ' ' + response.parsed_response['last_name']
+    parsed_response = response.parsed_response
-  end
 
-end
+    parsed_response['error'] ||
+      parsed_response['first_name'] + ' ' + response.parsed_response['last_name']
+  end
+end