API pagination inconsistency in Developer Portal

[tgtshanika]

Description

When showing APIs in Developer Portal, we are only showing the latest version when there are multiple API versions. But the APIs are not properly aligned into pages. The reason is that the filtering for latest version and pagination is done from the code level after retrieving APIs with versions from the DB (registry).

Solutions

APIs needs to be filtered properly (with the latest version) from the persistence level (Registry) itself.

There are a few ways we can check:

• Check whether we can achieve this from solr level itself by a proper aggregation query
• If not possible, add a property with a number representing the version of the API when the API is published. Then search and get the API with maximum number for each name.
• If not possible, we can use a property (eg: latest:true) based search. The property needs to be properly updated when a new API's lifecycle change happened (this is the hardest approach and also need a migration). eg:
  • API1:1.0.0 created
  • API1:1.0.0 published => API1:1.0.0 latest:true
  • API1:2.0.0 created => API1:1.0.0 latest:true
  • API1:2.0.0 published => API1:1.0.0 latest:false, API1:2.0.0 latest:true
  • API1:2.0.0 deleted => API1:1.0.0 latest:true

[isharac]

This can be achieved with a solr query
group=true&group.field=name&group.ngroups=true&group.sort=version desc

However, with the default sorting, if we have API version as 1.0.0. 2.0.0 10.0.0 the latest version is selected as 2.0.0 instead of 10.0.0 because version is considered as a string

[isharac]

To fix the above issue it has introduced a new field in solr which sets a timestamp to each API version created. Based on that latest API version is fetched to display in the devportal when displayMultipleVersions config is not enabled.