How to store user activity that supports undo?
I can track user activity on posts, so that users can see for example "2 updates!". The essence of the strategy I’m using leverages 2 tables:
post_activity:
post_id | user_id | time_created
post_users:
post_id | user_id | time_created | time_last_seen
With these 2 tables, I can query all records from post_activity where the post_user.time_last_seen is less than the post_activity.time_created for a count of all new items.
The problem is that post_activity is essentially an anonymous log, with no associated rows or notion of the type of action that caused it. What I can’t solve is for example this scenario:
- User A creates new post (1 new activity stored)
- User B comments on new post (1 new activity stored)
- User C sees "2 new!" but...
- User A or B deletes their contribution.
As far as the system is concerned, there are 2 unseen items but the user may see nothing!
Can anyone provide a simple demonstration of how I might have a stronger relationship between activity and user actions here? Particularly one that supports unseen deleted activity?
postgresql database-design
asked Mar 24 '16 at 0:05
jlmakesjlmakes
1062
bumped to the homepage by Community♦ 11 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I can track user activity on posts, so that users can see for example "2 updates!". The essence of the strategy I’m using leverages 2 tables:
post_activity:
post_id | user_id | time_created
post_users:
post_id | user_id | time_created | time_last_seen
With these 2 tables, I can query all records from post_activity where the post_user.time_last_seen is less than the post_activity.time_created for a count of all new items.
The problem is that post_activity is essentially an anonymous log, with no associated rows or notion of the type of action that caused it. What I can’t solve is for example this scenario:
- User A creates new post (1 new activity stored)
- User B comments on new post (1 new activity stored)
- User C sees "2 new!" but...
- User A or B deletes their contribution.
As far as the system is concerned, there are 2 unseen items but the user may see nothing!
Can anyone provide a simple demonstration of how I might have a stronger relationship between activity and user actions here? Particularly one that supports unseen deleted activity?
postgresql database-design
asked Mar 24 '16 at 0:05
jlmakesjlmakes
1062
bumped to the homepage by Community♦ 11 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
copy on write to post_activity_history table
– Neil McGuigan
Mar 24 '16 at 20:13
add a comment |
I can track user activity on posts, so that users can see for example "2 updates!". The essence of the strategy I’m using leverages 2 tables:
post_activity:
post_id | user_id | time_created
post_users:
post_id | user_id | time_created | time_last_seen
With these 2 tables, I can query all records from post_activity where the post_user.time_last_seen is less than the post_activity.time_created for a count of all new items.
The problem is that post_activity is essentially an anonymous log, with no associated rows or notion of the type of action that caused it. What I can’t solve is for example this scenario:
- User A creates new post (1 new activity stored)
- User B comments on new post (1 new activity stored)
- User C sees "2 new!" but...
- User A or B deletes their contribution.
As far as the system is concerned, there are 2 unseen items but the user may see nothing!
Can anyone provide a simple demonstration of how I might have a stronger relationship between activity and user actions here? Particularly one that supports unseen deleted activity?
postgresql database-design
asked Mar 24 '16 at 0:05
jlmakesjlmakes
1062
I can track user activity on posts, so that users can see for example "2 updates!". The essence of the strategy I’m using leverages 2 tables:
post_activity:
post_id | user_id | time_created
post_users:
post_id | user_id | time_created | time_last_seen
With these 2 tables, I can query all records from post_activity where the post_user.time_last_seen is less than the post_activity.time_created for a count of all new items.
The problem is that post_activity is essentially an anonymous log, with no associated rows or notion of the type of action that caused it. What I can’t solve is for example this scenario:
- User A creates new post (1 new activity stored)
- User B comments on new post (1 new activity stored)
- User C sees "2 new!" but...
- User A or B deletes their contribution.
As far as the system is concerned, there are 2 unseen items but the user may see nothing!
Can anyone provide a simple demonstration of how I might have a stronger relationship between activity and user actions here? Particularly one that supports unseen deleted activity?
postgresql database-design
postgresql database-design
asked Mar 24 '16 at 0:05
jlmakesjlmakes
1062
asked Mar 24 '16 at 0:05
jlmakesjlmakes
1062
asked Mar 24 '16 at 0:05
jlmakesjlmakes
1062
asked Mar 24 '16 at 0:05
jlmakesjlmakes
1062
asked Mar 24 '16 at 0:05
jlmakesjlmakes
1062
1062
bumped to the homepage by Community♦ 11 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 11 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
copy on write to post_activity_history table
– Neil McGuigan
Mar 24 '16 at 20:13
add a comment |
copy on write to post_activity_history table
– Neil McGuigan
Mar 24 '16 at 20:13
copy on write to post_activity_history table
– Neil McGuigan
Mar 24 '16 at 20:13
copy on write to post_activity_history table
– Neil McGuigan
Mar 24 '16 at 20:13
add a comment |
1 Answer
1
active
oldest
votes
Create a TRIGGER on the table in which deletes are recorded and update related tables as required.
Relevant postgresql documentation
- Info about triggers: http://www.postgresql.org/docs/9.5/static/triggers.html
- How to create a trigger: http://www.postgresql.org/docs/9.5/static/sql-createtrigger.html
answered Mar 24 '16 at 15:09
SergeSerge
49738
I think triggers could be a good fit here, but what I’m still unclear on is how to target the right record in the activity table—I can’t just remove the most recent, because other activity may be generated before someone deletes an unseen post.
– jlmakes
Mar 24 '16 at 19:06
add a comment |
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1 Answer
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oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Create a TRIGGER on the table in which deletes are recorded and update related tables as required.
Relevant postgresql documentation
- Info about triggers: http://www.postgresql.org/docs/9.5/static/triggers.html
- How to create a trigger: http://www.postgresql.org/docs/9.5/static/sql-createtrigger.html
answered Mar 24 '16 at 15:09
SergeSerge
49738
I think triggers could be a good fit here, but what I’m still unclear on is how to target the right record in the activity table—I can’t just remove the most recent, because other activity may be generated before someone deletes an unseen post.
– jlmakes
Mar 24 '16 at 19:06
add a comment |
Create a TRIGGER on the table in which deletes are recorded and update related tables as required.
Relevant postgresql documentation
- Info about triggers: http://www.postgresql.org/docs/9.5/static/triggers.html
- How to create a trigger: http://www.postgresql.org/docs/9.5/static/sql-createtrigger.html
answered Mar 24 '16 at 15:09
SergeSerge
49738
I think triggers could be a good fit here, but what I’m still unclear on is how to target the right record in the activity table—I can’t just remove the most recent, because other activity may be generated before someone deletes an unseen post.
– jlmakes
Mar 24 '16 at 19:06
add a comment |
Create a TRIGGER on the table in which deletes are recorded and update related tables as required.
Relevant postgresql documentation
- Info about triggers: http://www.postgresql.org/docs/9.5/static/triggers.html
- How to create a trigger: http://www.postgresql.org/docs/9.5/static/sql-createtrigger.html
answered Mar 24 '16 at 15:09
SergeSerge
49738
Create a TRIGGER on the table in which deletes are recorded and update related tables as required.
Relevant postgresql documentation
- Info about triggers: http://www.postgresql.org/docs/9.5/static/triggers.html
- How to create a trigger: http://www.postgresql.org/docs/9.5/static/sql-createtrigger.html
answered Mar 24 '16 at 15:09
SergeSerge
49738
answered Mar 24 '16 at 15:09
SergeSerge
49738
answered Mar 24 '16 at 15:09
SergeSerge
49738
answered Mar 24 '16 at 15:09
SergeSerge
49738
49738
I think triggers could be a good fit here, but what I’m still unclear on is how to target the right record in the activity table—I can’t just remove the most recent, because other activity may be generated before someone deletes an unseen post.
– jlmakes
Mar 24 '16 at 19:06
add a comment |
I think triggers could be a good fit here, but what I’m still unclear on is how to target the right record in the activity table—I can’t just remove the most recent, because other activity may be generated before someone deletes an unseen post.
– jlmakes
Mar 24 '16 at 19:06
I think triggers could be a good fit here, but what I’m still unclear on is how to target the right record in the activity table—I can’t just remove the most recent, because other activity may be generated before someone deletes an unseen post.
– jlmakes
Mar 24 '16 at 19:06
I think triggers could be a good fit here, but what I’m still unclear on is how to target the right record in the activity table—I can’t just remove the most recent, because other activity may be generated before someone deletes an unseen post.
– jlmakes
Mar 24 '16 at 19:06
add a comment |
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copy on write to post_activity_history table
– Neil McGuigan
Mar 24 '16 at 20:13