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Fix for pagination ‘last’ link to give the real last page #353

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Merged
mblayman merged 3 commits into django-json-api:develop from yanivp:bugfix/fix_pagination_last_link
May 28, 2017
Merged

Fix for pagination ‘last’ link to give the real last page #353

mblayman merged 3 commits into django-json-api:develop from yanivp:bugfix/fix_pagination_last_link
May 28, 2017

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@yanivp yanivp commented May 24, 2017

We're working on a project using django-json-api and came across unintuitive behavior for the pagination. The current pagination implementation for the 'last' link is basically a 'total count' - 'limit'. Consider the following example:

Objects = [0-21]
Limit = 10
(first page - offset 0)
0,1,2,3,4,5,6,7,8,9

(clicking 'next' - offset 10)
10,11,12,13,14,15,16,17,18,19

(clicking 'next' - offset 20)
20,21

(clicking 'last' - offset 12)
12,13,14,15,16,17,18,19,20,21

This behavior would make the user completely disoriented in the paging. It makes more sense that 'last' will offset to 20 just the same as clicking 'next'->'next'->'next' and simply return two objects instead of 10.

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Hi, @yanivp. Thanks for your contribution! It looks like you're a first time contributor so I'm excited that you took the time to help.

The PR, in its current state, can't be merged because the test suite is reporting failure (you can use the error at https://travis-ci.org/django-json-api/django-rest-framework-json-api/builds/235614695?utm_source=github_status&utm_medium=notification). Either the fix is not quite correct and the tests are saving us from making a mistake, or the test is not correct. Could you please look into what the issue is?

Also, please add your name to the AUTHORS file to give you some credit for your contribution. The listing is alphabetical by first name.

Let me know if you have any questions. Thanks again!

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yanivp commented May 28, 2017

Hey @mblayman
You're right I forgot to run the tests, fixed and also added myself to AUTHORS

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codecov-io commented May 28, 2017
edited
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Codecov Report

Merging #353 into develop will decrease coverage by 0.02%.
The diff coverage is 100%.

Impacted file tree graph

@@ Coverage Diff @@
## develop #353 +/- ##
===========================================
- Coverage 77.09% 77.06% -0.03% 
===========================================
 Files 50 50 
 Lines 6026 6027 +1 
===========================================
- Hits 4646 4645 -1 
- Misses 1380 1382 +2
Impacted Files Coverage Δ
rest_framework_json_api/pagination.py 54.81% <100%> (ø) ⬆️
example/tests/unit/test_pagination.py 100% <100%> (ø) ⬆️
example/models.py 66.95% <0%> (-0.13%) ⬇️

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👍 Good stuff. Thank you!

@mblayman mblayman merged commit ab4e1bd into django-json-api:develop May 28, 2017
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