S3Report

S3Report is a REST method handler for data analysis.

Functionality

S3Report can generate contingency tables (a.k.a. pivot tables) from S3Resources.

Dependencies

S3Report uses ​pyvttbl to generate contingency tables. A modified version of pyvttbl is integrated into the S3 framework.

Pyvttbl requires the following Python modules:

• numpy
• matplotlib

URL Methods

S3Report responds to the report URL method, for all resources (generic method).

The following parameters are accepted:

Parameter	Explanation	required?
rows	the name of the field to be used for the table rows	yes
cols	the name of the field to be used for the table columns	no (if no cols are specified, all instance values appear in 1 column)
fact	the name of the field to be used for the instance values	no (falls back to "name" if present, otherwise to "id")
aggregate	the aggregation function	no (default: list)

rows, cols and fact support the same options as list_fields:

• fields in the table
• virtual fields in the table
• fields/virtual fields in tables linked by foreign keys ($-notation)

S3Report supports a number of aggregation functions. The following functions have been tested so far:

Function	Explanation
list	a comma-separated list of all instance values
count	the number of instance values
sum	the sum of all instance values
avg	the average (mean) of all instance values

Examples

• ​http://localhost:8000/eden/org/organisation/report?rows=country&cols=sector_id&fact=name
• ​http://localhost:8000/eden/pr/person/report?rows=age_group&cols=gender&fact=id&aggregate=count

$-notation for references:

• ​http://localhost:8000/eden/org/office/report?rows=location_id$parent&cols=type&fact=name

reduced parameter list:

• ​http://localhost:8000/eden/org/office/report?rows=type&aggregate=count
• ​http://localhost:8000/eden/org/organisation/report?rows=sector_id

Report Options

Table configurations can contain a report_options item, which is a Storage object. This object is used to configure reports and report options form.

The rows, cols, facts and aggregate items are lists of available values for the user to select from.

The defaults item is a Storage object that contains the default values for the report. It can contain a value for rows, cols, fact, aggregate and totals (as described in URL Methods).

Here is an example of a report_options item:

report_options = Storage(
        rows = report_fields,
        cols = report_fields,
        facts = report_fields,
        defaults = Storage(
                rows = "project_id",
                cols = "name",
                fact = "time_actual",
                aggregate = "sum",
                totals = True
        )

All items in report_options and defaults are optional.

Further Development

The following enhancements are currently under development:

• Support for JSON, CSV and XLS exports
• Support for client-side graphs representation (via JSON)