Plots2: Wrong wiki count in Dropdown by type

[keshavsethi]

In https://publiclab.org/contributors/newsletter dropdown by type Wiki pages is showing 3 but on clicking it shows only 1
Image is shown below

[keshavsethi]

If we click on by Views button then it shows all 3 but again if try to sort all 3 of them by title it again shows 1 newsletter

[gabrielbaldao]

Can I try fix this?

[keshavsethi]

yes, you can try this but before doing this get it reviewed by @SidharthBansal @nstjean @jywarren

[SidharthBansal]

Sure. Please provide a fix

[NitinBhasneria]

@gabrielbaldao are you doing this or can I proceed?

[SidharthBansal]

Go ahead

[jywarren]

Note we should make this match the code and tests here: https://github.com/publiclab/plots2/pull/7476

and the idea for a "single source of truth" here: https://github.com/publiclab/plots2/issues/6855#issuecomment-578331475

Thank you!

[jywarren]

And noting a more detailed investigation here -- I think we need to be sure all counts are from a unified body of code maintained in the models, and unit tested!

https://github.com/publiclab/plots2/issues/7965#issuecomment-644980326

[jywarren]

So we should confirm that all counts are coming from the respective Tag.count style methods. Key areas are here:

https://github.com/ckchu8/plots2/blob/0fbcc07bd61fd238d88779e49a3fbd2e300ef041/app/controllers/tag_controller.rb#L542-L561

And on tag cards, for example on https://publiclab.org/tags

[jywarren]

Just noting that the original issue at top may be a special case. I see in the DB that we're fetching these three pages:

• https://publiclab.org/n/3928 https://publiclab.org/wiki/newsletter (Public Lab Community Newsletter)
• https://publiclab.org/n/4965 https://publiclab.org/newsletter (Newsletter)
• https://publiclab.org/wiki/subscribe

Only the middle one is the correct one. The first may be some kind of strange clone... not sure. From the early days of the site? And the last, doesn't look like a page anymore?

Here are the full records:

irb(main):005:0> Node.for_tagname_and_type('newsletter', 'page', wildcard: false).last => #<Node nid: 4965, vid: 18544, type: "page", language: "", title: "Newsletter", uid: 1, status: 1, created: 1353450804, changed: 1484959036, comment: 0, promote: 0, moderate: 0, sticky: 0, tnid: 0, translate: 0, cached_likes: 1, comments_count: 0, drupal_node_revisions_count: 5, path: "/wiki/newsletter", main_image_id: nil, slug: "newsletter", views: 1471, latitude: nil, longitude: nil, precision: nil>

irb(main):006:0> Node.for_tagname_and_type('newsletter', 'page', wildcard: false).first => #<Node nid: 308, vid: 20121, type: "page", language: "", title: "Subscribe", uid: 1, status: 1, created: 1306885186, changed: 1484959009, comment: 0, promote: 0, moderate: 0, sticky: 0, tnid: 0, translate: 0, cached_likes: 0, comments_count: 0, drupal_node_revisions_count: 13, path: "/subscribe", main_image_id: nil, slug: "subscribe", views: 25, latitude: nil, longitude: nil, precision: nil>

irb(main):007:0> Node.for_tagname_and_type('newsletter', 'page', wildcard: false)[1] => #<Node nid: 4965, vid: 18544, type: "page", language: "", title: "Newsletter", uid: 1, status: 1, created: 1353450804, changed: 1484959036, comment: 0, promote: 0, moderate: 0, sticky: 0, tnid: 0, translate: 0, cached_likes: 1, comments_count: 0, drupal_node_revisions_count: 5, path: "/wiki/newsletter", main_image_id: nil, slug: "newsletter", views: 1471, latitude: nil, longitude: nil, precision: nil>

Very mysterious!

[jywarren]

Jeanette from PL noted this page also has an elevated number of wiki pages listed on the tab count:

83 is a much bigger error than what @keshavsethi had found, as only 6 wiki pages are shown. We can go into the database directly to just skim what those wiki pages actually are, in the query returning 86, and compare the queries too.

[jywarren]

OK! The disparity, for the method tag, is these different queries:

irb(main):002:0> Node.for_tagname_and_type('method', 'page', wildcard: false).count
=> 83
irb(main):001:0> Tag.find_nodes_by_type('method','page').count
=> 5

I'll look at the code behind them to confirm what's going on.

Here is the tab count: https://github.com/publiclab/plots2/blob/92834ead6c53d6d9431bb99024d4044b282518be/app/controllers/tag_controller.rb#L542-L561

It references Node.for_tagname_and_type:

https://github.com/publiclab/plots2/blob/122e8a73b440bb752f080375aad3f24a02b7c8f9/app/models/node.rb#L621-L630

By contrast, Tag.find_nodes_by_type is here:

https://github.com/publiclab/plots2/blob/122e8a73b440bb752f080375aad3f24a02b7c8f9/app/models/tag.rb#L94-L116

Noting that the first 6 items on both https://publiclab.org/wiki/tag/method and https://publiclab.org/methods are the same, but /wiki/tag/method cuts off after 6. A clue? 🕵️

[jywarren]

Both segments of code are significantly complicated by parent tag references.

[jywarren]

OK, so the difference is in the limit term:

irb(main):010:0> Tag.find_nodes_by_type('method','page', false).count
=> 83
irb(main):011:0> Tag.find_nodes_by_type('method','page').count
=> 5

Let's track where the limit is being set on https://publiclab.org/wiki/tag/method

But, a follow-up could be to consolidate this code and/or remove the parent functionality.

[jywarren]

So, the query for the listing of wiki pages in the table below on /wiki/tag/method is: https://github.com/publiclab/plots2/blob/92834ead6c53d6d9431bb99024d4044b282518be/app/controllers/tag_controller.rb#L117

I /believe/ none of these have parent tag issues, having checked in the db. So we're left with a strange mystery of pagination, which I can't quite figure out.

Each of these pages show a different collection, with some overlapping items:

• https://publiclab.org/wiki/tag/method
• https://publiclab.org/wiki/tag/method?page=2
• https://publiclab.org/wiki/tag/method?page=3
• https://publiclab.org/wiki/tag/method?page=4

We can probably get all 83 pages this way. So it could be pagination being missing -- we could activate by adding @pagination = true in the controller, to activate this line:

https://github.com/publiclab/plots2/blob/92834ead6c53d6d9431bb99024d4044b282518be/app/views/wiki/_wikis.html.erb#L30

But there's something else -- why is Odor Logging and Stormwater Monitoring the top entry for both the first couple pages? And why does Facilitate your meetings show up again on pages 3 and 4? Something is going on with our query.

[jywarren]

Let's fix pagination, and then return here to see what we can do about the repeated display of some items, as well as figure out why page 1 shows only 6, but later pages show a full 24 (i think?)???

[jywarren]

VERY strange -- https://github.com/publiclab/plots2/pull/8243#issuecomment-668782325 --- pagination mysteries persist...

[jywarren]

OK, noting from this comment that the /tag/____ page is cached every 5 mins.

[jywarren]

Indeed:

> Node.for_tagname_and_type('method','page',question:false).paginate(page: 1,per_page: 24).order('node_revisions.timestamp DESC').length
=> 4

[jywarren]

It seems to be the mix of .order('node_revisions.timestamp DESC') and .paginate() that is causing this. If I remove one, it starts to return 24 items:

irb(main):089:0> Node.for_tagname_and_type('method','page',question:false).paginate(page: 1,per_page: 24).order('node_revisions.timestamp DESC').length
=> 4
irb(main):090:0> Node.for_tagname_and_type('method','page',question:false).paginate(page: 1,per_page: 24).length
=> 24
irb(main):091:0> Node.for_tagname_and_type('method','page',question:false).order('node_revisions.timestamp DESC').paginate(page: 1,per_page: 24).length
=> 4

[jywarren]

https://github.com/publiclab/plots2/blob/f38bd542c380185f504a82b2806a49995ef0f736/app/models/node.rb#L626-L629

[jywarren]

I believe this may be an issue with our pagination library, will_paginate --

• https://github.com/mislav/will_paginate/issues/573
• https://github.com/mislav/will_paginate/issues/604
• esp "Missing record on pagination when records are sorted" https://github.com/mislav/will_paginate/issues/553

[jywarren]

Maybe we look at

• https://github.com/kaminari/kaminari or
• https://www.imaginarycloud.com/blog/paginating-ruby-on-rails-apps-with-pagy/ (https://github.com/ddnexus/pagy)

[jywarren]

OK, we've installed pagy gem for pagination in #8326 - let's see how this does in staging now.

[jywarren]

Confirming that https://unstable.publiclab.org/wiki/tag/method now shows https://unstable.publiclab.org/wiki/tag/method?page=2, https://unstable.publiclab.org/wiki/tag/method?page=3, https://unstable.publiclab.org/wiki/tag/method?page=4 with all entries.

That resolves this original issue

(we should count the results to be sure)

however, I now notice that, strangely, the first page lists only 4, while later pages show the full max per-page limit:

[jywarren]

OK, we are doing better... 32 are listed. But the total should be 83!

13 are listed per page, so if the first page were missing, say, 9 to make a full 13, we'd still only be at 41 total. Let me try to get a list of the full 83 to check discrepancies...

[jywarren]

Here are all 83:

["bucket-monitor", "issue-brief", "facilitation", "air-sampling", "stormwater", "odor", "noise", "infragram", "raspberry-pi-infragram", "image-sequencer", "mapknitter", "purpleair", "thermal-flashlight", "pole-mapping", "optical-monitoring-of-particulate-matter", "simple-water-sensor-platform", "anonymity", "water-quality-sensor", "micro", "site-survey", "sampling", "pipeline-monitoring", "simple-air-sensor", "public-comment", "babylegs", "testing-our-waters", "passenger-pigeon", "coqui", "minivol", "emery-board", "indoor-air-quality-mapping", "turbidity", "start-enviro-monitor-study", "spectral-workbench", "soil-testing-toolkit", "filters", "nano-data-logger", "diy-indoor-air-quality-remediation-kit", "pole-mapping-kit-instructions", "balloon-mapping", "guides", "spectrometry", "conductivity", "particle-sensing", "microscopes", "webjack", "hydrogen-sulfide-copper-pipe", "data-logging", "filter-based-monitoring-of-particulate-matter", "kite-balloon-hybrid", "host-an-event", "water-sensors", "hydrogen-sulfide-photopaper", "hydrogen-sulfide-sensor", "dustduino", "timelapse", "sensor-enclosures", "riffle", "reagents", "thermal-photography", "photo-sharing", "water-sampling", "soil-sampling", "photo-monitoring", "biobroth-bubbler", "creating-a-media-campaign", "fido-the-raspberry-pi-based-temperature-alarm-that-sends-text-messages", "pdr-1500", "potentiostat", "kaptery-aerial-rigs", "aerial-photography", "mae-d-agua", "multispectral-imaging", "literature-review", "health-effects-lit-review", "tech-review", "refinery-watching", "gardening-toolkit", "air-column-monitor", "portable-energy-scavenging-kit", "environmental-estrogen-testing", "balloon-telemetry-kit", "stereo-camera"]

[jywarren]

OK - theory - just confirmed that the tag pin:test can remove a wiki page from being displayed on /wiki/tag/test (in gitpod). How many are being hidden this way???

[jywarren]

None from the 83. I'm going to try starting a development environment from staging and to try logging out the contents of the pagy() pagination collection. Very mysterious that only 4 appear on the first page.

[jywarren]

wow let's try this! https://ddnexus.github.io/pagy/how-to#custom-count-for-custom-scopes

@pagy, @records = pagy(custom_scope, count: custom_count)

[jywarren]

also noting https://ddnexus.github.io/pagy/extras/arel

[jywarren]

OK, ready to try this in unstable with:

source ../environment-dev.sh && docker-compose exec web passenger start

[jywarren]

custom count didn't work w/ nodes.count -- will try reproducing in unstable on the command line...

[jywarren]

OK, found a deep inconsistency:

irb(main):042:0> @pagy, nodesp = pagy(nodes.order('node_revisions.timestamp DESC')) # same as in controller
irb(main):048:0> nodesp.page(1).size
=> 20
irb(main):049:0> nodesp.page(1).collect(&:title)
=> ["Bucket Monitor", "Write an Issue Brief", "Facilitate your meetings", "Air Sampling"]
irb(main):050:0> nodesp.page(1).size
=> 20

Whoa....

irb(main):072:0> nodesp.page(1).length
=> 4
irb(main):073:0> nodesp.page(1).size
=> 20
irb(main):074:0> nodesp.page(1).count
=> 83
irb(main):075:0> nodesp.page(2).size
=> 20
irb(main):076:0> nodesp.page(3).size
=> 20
irb(main):077:0> nodesp.page(4).size
=> 20
irb(main):078:0> nodesp.page(1).size
=> 20

irb(main):079:0> nodesp.page(1).length
=> 4
irb(main):080:0> nodesp.page(2).length
=> 13
irb(main):081:0> nodesp.page(3).length
=> 6
irb(main):082:0> nodesp.page(4).length
=> 9
irb(main):083:0> nodesp.page(5).length
=> 10
irb(main):084:0> nodesp.page(6).length
=> 13
irb(main):085:0> nodesp.page(7).length
=> 8
irb(main):086:0> nodesp.page(8).length
=> 4

This totally doesn't match the displayed # of posts, which is:

• p1: 4 posts
• p2: 13 posts
• p3: 13 posts
• p4: 6 posts

[jywarren]

OK, it appears that the wild pagination occurs when running:

@pagy, nodesp = pagy(nodes.order('node_revisions.timestamp DESC'))

but not:

@pagy, nodesp = pagy(nodes.order('node.nid DESC'))

so i propose that as a short-term fix. This will sort them by descending nid which is very close to order of creation. Then we can deprioritize this - i'll leave a comment explaining: https://github.com/publiclab/plots2/commit/2a7d10030165b9b351391315600c944cb4198782