How To Fix A Bug – Building SaaS #56

Building SaaS (86 Part Series)

1 Building SaaS with Python and Django #1
2 Reporting scraped data – Building SaaS #2
… 82 more parts…
3 Multiple Stripe plans – Building SaaS #3
4 Using a background scheduler – Building SaaS #4
5 Updating data models – Building SaaS #5
6 Third party integration modeling – Building SaaS #6
7 Displaying third party data – Building SaaS #7
8 Connecting third party services – Building SaaS #8
9 Finishing third party integration – Building SaaS #9
10 Admin dashboards – Building SaaS #10
11 Semi-automated tasks – Building SaaS #11
12 Automation aides – Building SaaS #12
13 Deploying with Ansible – Building SaaS #13
14 Ansible Cranked to 11 – Building SaaS #14
15 Feature Flags with Django Waffle – Building SaaS #15
16 Feature Flags in Action – Building SaaS #16
17 Canceling Stripe Subscriptions – Building SaaS #17
18 Completing Account Deactivation – Building SaaS #18
19 Pip-tools and App Packaging – Building SaaS #19
20 Making a Shiv App – Building SaaS #20
21 Shiv zipapps and CI – Building SaaS #21
22 Upload to S3 with CircleCI orbs – Building SaaS #22
23 It’s Alive! A Django Shiv app – Building SaaS #23
24 In the Guts of a Shiv App – Building SaaS #24
25 It’s Permissions, Dummy! – Building SaaS #25
26 Connecting Shiv Apps with Ansible – Building SaaS #26
27 Plug the Shiv App Into Nginx – Building SaaS #27
28 Webpack and collectstatic in CI – Building SaaS #28
29 Add Static Assets to Deployment – Building SaaS #29
30 Ripping Out Node.js – Building SaaS #30
31 Celery In A Shiv App – Building SaaS #31
32 wal-e Postgres Backups – Building SaaS #32
33 Get Out, Git! – Building SaaS #33
34 Bring in the WhiteNoise, Bring in Da Funk – Building SaaS #34
35 Deploying WhiteNoise – Building SaaS #35
36 Configurama – Building SaaS #36
37 Lessons From A Failed SaaS – Building SaaS #37
38 New Project, Who Dis? – Building SaaS #38
39 django-environ and django-debug-toolbar – Building SaaS #39
40 Make A Custom User Model – Building SaaS #40
41 User Accounts With django-allauth – Building SaaS #41
42 Add Styles To Templates – Building SaaS #42
43 Use Tailwind On A Template – Building SaaS #43
44 Fast Forms With UpdateView – Building SaaS #44
45 Templates and Logic – Building SaaS #45
46 A Week At A Time – Building SaaS #46
47 How To Style Sign Up – Building SaaS #47
48 Onboarding – Building SaaS #48
49 Starting the Onboarding Flow – Building SaaS #49
50 Onboarding Continuity – Building SaaS #50
51 Onboarding Forms – Building SaaS #51
52 Consistent Onboarding – Building SaaS #52
53 More Onboarding Goodness – Building SaaS #53
54 User Testing Feedback – Building SaaS #54
55 Remodeling Data Relationships – Building SaaS #55
56 How To Fix A Bug – Building SaaS #56
57 Switch A Django Project To Use Pytest – Building SaaS #57
58 Bread and Butter Django – Building SaaS #58
59 Designing A View – Building SaaS #59
60 A View From Start To Finish – Building SaaS #60
61 Hackathon App – Building SaaS #61
62 Hackathon App Part 2 – Building SaaS #62
63 The Home Stretch – Building SaaS #63
64 Enrolling Students – Building SaaS #64
65 Docs, Bugs, and Reports – Building SaaS #66
66 Handle Default Values – Building SaaS #65
67 Give Me A Break… Day – Building SaaS #67
68 Rendering Calendars – Building SaaS #68
69 Polishing and Usability – Building SaaS #69
70 Predicting The Future – Building SaaS #70
71 Custom Form Validation – Building SaaS #71
72 Displaying Breaks – Building SaaS #72
73 Dynamically Regrouping QuerySets In Templates – Building SaaS #73
74 Check Web App Security With Bandit – Building SaaS #74
75 Make A Landing Page – Building SaaS #75
76 Capped Social Network – Building SaaS #76
77 Sending Invites – Building SaaS #77
78 Create A Form Template – Building SaaS #78
79 WhiteNoise Shenanigans – Building SaaS #79
80 Reordering Models – Building SaaS #80
81 Finishing Onboarding – Building SaaS #81
82 Customer Feedback – Building SaaS #82
83 Empty States – Building SaaS #83
84 Refactoring Enrollment – Building SaaS #84
85 Customer Docs – Building SaaS #85
86 Testing Email Designs – Building SaaS #86

In this episode, we picked an issue from GitHub and worked on it. I explained the flow of using test driven development to show how the bug existed in an automated test. We wrote the test, then fixed the code. After that, we did some test refactoring to clean things up.

We looked at what the issue was and how it is related to the handling of the Course model in a weekly view in the app.

I showed how the data model for the Course handles school days. Then I wrote the unit test that would show the failure for the issue.

Once we had a valid unit test in place, I switched to writing code for the Django view to make the test pass. Finally, we checked the behavior in the app to confirm that I fixed the issue.

With the issue fixed and the test passing, I refactored the test code to make the tests easier to understand and work with in the future.

This article first appeared on mattlayman.com.

Building SaaS (86 Part Series)

1 Building SaaS with Python and Django #1
2 Reporting scraped data – Building SaaS #2
… 82 more parts…
3 Multiple Stripe plans – Building SaaS #3
4 Using a background scheduler – Building SaaS #4
5 Updating data models – Building SaaS #5
6 Third party integration modeling – Building SaaS #6
7 Displaying third party data – Building SaaS #7
8 Connecting third party services – Building SaaS #8
9 Finishing third party integration – Building SaaS #9
10 Admin dashboards – Building SaaS #10
11 Semi-automated tasks – Building SaaS #11
12 Automation aides – Building SaaS #12
13 Deploying with Ansible – Building SaaS #13
14 Ansible Cranked to 11 – Building SaaS #14
15 Feature Flags with Django Waffle – Building SaaS #15
16 Feature Flags in Action – Building SaaS #16
17 Canceling Stripe Subscriptions – Building SaaS #17
18 Completing Account Deactivation – Building SaaS #18
19 Pip-tools and App Packaging – Building SaaS #19
20 Making a Shiv App – Building SaaS #20
21 Shiv zipapps and CI – Building SaaS #21
22 Upload to S3 with CircleCI orbs – Building SaaS #22
23 It’s Alive! A Django Shiv app – Building SaaS #23
24 In the Guts of a Shiv App – Building SaaS #24
25 It’s Permissions, Dummy! – Building SaaS #25
26 Connecting Shiv Apps with Ansible – Building SaaS #26
27 Plug the Shiv App Into Nginx – Building SaaS #27
28 Webpack and collectstatic in CI – Building SaaS #28
29 Add Static Assets to Deployment – Building SaaS #29
30 Ripping Out Node.js – Building SaaS #30
31 Celery In A Shiv App – Building SaaS #31
32 wal-e Postgres Backups – Building SaaS #32
33 Get Out, Git! – Building SaaS #33
34 Bring in the WhiteNoise, Bring in Da Funk – Building SaaS #34
35 Deploying WhiteNoise – Building SaaS #35
36 Configurama – Building SaaS #36
37 Lessons From A Failed SaaS – Building SaaS #37
38 New Project, Who Dis? – Building SaaS #38
39 django-environ and django-debug-toolbar – Building SaaS #39
40 Make A Custom User Model – Building SaaS #40
41 User Accounts With django-allauth – Building SaaS #41
42 Add Styles To Templates – Building SaaS #42
43 Use Tailwind On A Template – Building SaaS #43
44 Fast Forms With UpdateView – Building SaaS #44
45 Templates and Logic – Building SaaS #45
46 A Week At A Time – Building SaaS #46
47 How To Style Sign Up – Building SaaS #47
48 Onboarding – Building SaaS #48
49 Starting the Onboarding Flow – Building SaaS #49
50 Onboarding Continuity – Building SaaS #50
51 Onboarding Forms – Building SaaS #51
52 Consistent Onboarding – Building SaaS #52
53 More Onboarding Goodness – Building SaaS #53
54 User Testing Feedback – Building SaaS #54
55 Remodeling Data Relationships – Building SaaS #55
56 How To Fix A Bug – Building SaaS #56
57 Switch A Django Project To Use Pytest – Building SaaS #57
58 Bread and Butter Django – Building SaaS #58
59 Designing A View – Building SaaS #59
60 A View From Start To Finish – Building SaaS #60
61 Hackathon App – Building SaaS #61
62 Hackathon App Part 2 – Building SaaS #62
63 The Home Stretch – Building SaaS #63
64 Enrolling Students – Building SaaS #64
65 Docs, Bugs, and Reports – Building SaaS #66
66 Handle Default Values – Building SaaS #65
67 Give Me A Break… Day – Building SaaS #67
68 Rendering Calendars – Building SaaS #68
69 Polishing and Usability – Building SaaS #69
70 Predicting The Future – Building SaaS #70
71 Custom Form Validation – Building SaaS #71
72 Displaying Breaks – Building SaaS #72
73 Dynamically Regrouping QuerySets In Templates – Building SaaS #73
74 Check Web App Security With Bandit – Building SaaS #74
75 Make A Landing Page – Building SaaS #75
76 Capped Social Network – Building SaaS #76
77 Sending Invites – Building SaaS #77
78 Create A Form Template – Building SaaS #78
79 WhiteNoise Shenanigans – Building SaaS #79
80 Reordering Models – Building SaaS #80
81 Finishing Onboarding – Building SaaS #81
82 Customer Feedback – Building SaaS #82
83 Empty States – Building SaaS #83
84 Refactoring Enrollment – Building SaaS #84
85 Customer Docs – Building SaaS #85
86 Testing Email Designs – Building SaaS #86

原文链接：How To Fix A Bug – Building SaaS #56