Metrics

Metrics calculations must be executed everyday. Some rake task have been added to perform it.

To execute all metrics at once. Related to previous date from today
```
bundle exec rake decidim:metrics:all
```
To execute an specific metric. Related to previous date from today
```
bundle exec rake decidim:metrics:one["<metric name>"]
```

To execute metrics for a given date (all or an specific one)

bundle exec rake decidim:metrics:all["YYYY-MM-DD"]
bundle exec rake decidim:metrics:one["<metric name>","YYYY-MM-DD"]

It is possible to rebuild one or all metrics since some specific day. This is useful in case current metrics are no generated or corrupt. Depending on the size of the database this can take a long time!. The command will execute the same calculations as the commands above for each day between today and the date specified.

To rebuild metrics since a given date (all or an specific one)

bundle exec rake decidim:metrics:rebuild["YYYY-MM-DD"]
bundle exec rake decidim:metrics:rebuild["<metric name>","YYYY-MM-DD"]

Available metrics

Use the command decidim:metrics:list to list all available metrics using the console:

bundle exec rake decidim:metrics:list

Currently, available metrics are:

users, created Users
proposals, published, not withdrawn and not hidden Proposals
accepted_proposals, accepted Proposals
supports, supports given to Proposals
assemblies, published Assemblies
participatory_processes, published ParticipatoryProcesses
results, Results in Accountability
comments, Comments generated by users, related to public elements and not hidden
meetings, public Meetings

Only available for ParticipatorySpaces (restricted to ParticipatoryProcesses)

participants, unique users who make at least one of the following actions:
- Answer a survey
- Create a debate
- Create a proposal
- Endorse a proposal
- Leave a comment
- Support a proposal
- Vote a participatory budgeting project
followers, unique users who follow any participatory element in a ParticipatorySpace
endorsements, number of Endorsements in Proposals, within a ParticipatorySpace
debates, number of Debates within a ParticipatorySpace
survey_answers, number of answered Surveys by users within a ParticipatorySpace

Configuration

A crontab line must be added to your server to maintain them updated daily. You could use Whenever to manage it directly from the APP. You probably want to schedule a bundle exec rake decidim:metrics:all every night.
An ActiveJob queue, like Sidekiq or DelayedJob

Persistence

The metrics module percomutes calculations and persists them into decidim_metrics database table. So this module only uses one single table to persist metrics from all times and types.

The decidim_metrics table has the following fields:

day: the day for which the metric has been computed.
metric_type: the type of the metric. One of: users, proposals, accepted_proposals, supports, assemblies.
cumulative: quantity accumulated to day `"day`".
quantity: quantity for the current day, `"day`".
decidim_organization_id: the FK to the organization to which this Metric belongs to.
participatory_space_type + participatory_space_id: the FK to the participatory space to which this Metric belongs to, if any.
related_object_type + related_object_id: the FK to the object to which this Metric belongs to, if any.
decidim_category_id: the FK to the category for this Metric, if any.

Relations around decidim_metrics table:

                                                    +------------------------+
+--------------+                                    | ParticipatoryProcesses |
| Organization |                               +----+------------------------+
+------+-------+                               |
       |            +--------------------+     |    +------------+
       |            |                    |     +----+ Assemblies |
       |     +----->+ ParticipatorySpace +<----+    +------------+
       |     |      |                    |     |    +-------------+
       |     |      +--------------------+     +----+ Initiatives |
       |     |                                 |    +-------------+
       |     |                                 |
       |     |                                 |    +---------------+
 +-----+-------+---+                           +----+ Consultations |
 |                 |                                +---------------+
 | decidim_metrics |
 |                 |
 +--------+--------+       +----------------+
          |                | related_object |
          +--------------->+                |
                           | [polymorphic]  |
                           +----------------+