Upgrade Rails to 6.0.2.2 and fix deprecations

api/Gemfile

@@ -32,7 +32,7 @@ source 'https://rubygems.org'
 
 ruby '2.6.3'
 
-gem 'rails', '>= 5.2.4.2'
+gem 'rails', '>= 6.0.2.2'
 
 gem 'activeadmin', '>= 2.2.0'
 gem 'addressable'

api/Gemfile.lock

@@ -128,9 +128,8 @@ GEM
  railties (>= 5.0, < 6.1)
  responders (>= 2, < 4)
  jaro_winkler (1.5.2)
- jbuilder (2.8.0)
- activesupport (>= 4.2.0)
- multi_json (>= 1.2)
+ jbuilder (2.10.0)
+ activesupport (>= 5.0.0)
  jquery-rails (4.3.5)
  rails-dom-testing (>= 1, < 3)
  railties (>= 4.2.0)
@@ -167,7 +166,6 @@ GEM
  mini_mime (1.0.2)
  mini_portile2 (2.4.0)
  minitest (5.14.0)
- multi_json (1.13.1)
  mysql2 (0.5.2)
  netrc (0.11.0)
  nio4r (2.5.2)
@@ -200,7 +198,7 @@ GEM
  nio4r (~> 2.0)
  rack (2.2.2)
  rack-cors (1.1.1)
- rack (>= 1.6.0)
+ rack (>= 2.0.0)
  rack-ssl (1.4.1)
  rack
  rack-test (1.1.0)
@@ -352,7 +350,7 @@ DEPENDENCIES
  puma (>= 3.12.4)
  rack-cors (>= 1.0.5)
  rack-ssl
- rails (>= 5.2.4.2)
+ rails (>= 6.0.2.2)
  redis (~> 3.3.3)
  rest-client
  rspec-rails (>= 3.8.2)

api/spec/rails_helper.rb

@@ -37,7 +37,6 @@
 require 'request_spec_helper'
 require 'rspec/rails'
 require 'shoulda/matchers'
-require 'action_cable/testing/rspec'
 
 # Add additional requires below this line. Rails is not loaded until this point!
 

api/spec/requests/archives_request_spec.rb

@@ -89,7 +89,7 @@
  get retro_archive_path(wrong_retro, archive), as: :json
 
  expect(response).to be_forbidden
- expect(response.content_type).to eq('application/json')
+ expect(response.media_type).to eq('application/json')
 
  expect(JSON.parse(response.body)).to eq({})
  end

api/spec/requests/item_request_spec.rb

@@ -355,7 +355,7 @@
  do_request
 
  expect(response).to have_http_status(:not_found)
- expect(response.content_type).to eq('application/json')
+ expect(response.media_type).to eq('application/json')
 
  expect(JSON.parse(response.body)).to eq({})
  end

api/spec/requests/retros_request_spec.rb

@@ -232,7 +232,7 @@
  get "/api/retros/#{retro.id}", headers: headers, as: :json
 
  expect(response).to have_http_status(:not_found)
- expect(response.content_type).to eq('application/json')
+ expect(response.media_type).to eq('application/json')
 
  expect(JSON.parse(response.body)).to eq({})
  end