Report builder API

System Reports

Column

Column overview

Column instances define the data captured/displayed within a report column - typically:

• How the data is retrieved, either a simple SQL table.field fragment or an expression that returns a value
• They type of data that is being retrieved (int, text, datetime, etc)
• How that data should be presented in a report (for instance calling userdate() on datetime types)

Column types

• Text
• Integer (Integer numbers)
• Float (Decimal numbers)
• Timestamp (Dates)
• Boolean (Yes / No values)
• Longtext

Creating columns

To create a new column, just create a new instance of reportbuilder/classes/local/report/column.php class with:

• string $name
• ?lang_string $title
• string $entityname

And use:
add_joins() to add any extra SQL joins the column might need
set_type() to add the column type (All constant types are defined within the same column class)
set_is_sortable() to define if column can be sorted (For example we don't want to sort if the column shows just a picture)
add_callback() to format the output of the column
add_field() to add any db fields format callback might need

Example:

$columns[] = (new column(

           'starttime',
           new lang_string('task_starttime', 'admin'),
           $this->get_entity_name()
       ))
           ->add_joins($this->get_joins())
           ->set_type(column::TYPE_TIMESTAMP)
           ->add_field("{$tablealias}.timestart")
           ->set_is_sortable(true)
           ->add_callback([format::class, 'userdate']);

Filter

Filter overview

Report filters can be defined for a report and allow users to narrow down (filter) the data that is displayed in a report

• They define the data being filtered, either a simple SQL fragment or expression.
• The type of filtering being performed (int, text, datetime, etc).

Filter types are extendable, allowing for the addition of many more as suits each use case. We have provided common ones that cover most use cases.

Note that filters & columns are entirely separate concepts in the report, and each can be used without a matching column/filter (that is to say, we can add a report filter for a user field without needing the column for the same field to be present in the report).

Filter types

• Text (reportbuilder/classes/local/filters/text.php)
• Date (reportbuilder/classes/local/filters/date.php)
• Number (reportbuilder/classes/local/filters/number.php)
• Boolean Select (reportbuilder/classes/local/filters/boolean_select.php)
• Select (reportbuilder/classes/local/filters/select.php)
• Course selector (reportbuilder/classes/local/filters/course_selector.php)

Creating filters

To create a new filter, just create a new instance of reportbuilder/classes/local/report/filter.php class with:

• string $filterclass
• string $name
• lang_string $header
• string $entityname
• string $fieldsql =
• array $fieldparams = []

Example:

$filters[] = (new filter(

           course_selector::class,
           'courseselector',
           new lang_string('courses'),
           $this->get_entity_name(),
           "{$tablealias}.id"
       ))
           ->add_joins($this->get_joins());

Entity

An Entity is a collection of elements where an element is a column or a filter. An entity is re-usable across many system reports and we can add only the entity columns or filters that we need on each report.

Create an entity

To create an entity, the new entity class must extend /reportbuilder/classes/local/entities/base.php class and must include these methods:

get_default _table_aliases() get_default_entity_title() get_default_entity_name() initialise() get_all_columns() get_all_filters()

get_default _table_aliases()

Defines the SQL alias for the database tables the entity uses.

get_default_entity_title()

Defines the default title for this entity.

get_default_entity_name()

Defines the default internal name for this entity that will be used to manage columns and filters.

initialise()

This is where we add the entity columns and filters.

get_all_columns() and get_all_filters()

This is where we define the entity columns and filters.

Examples

Report Builder has two entities as an example to start building reports:

User entity: reportbuilder/classes/local/entities/user.php
Course entity: reportbuilder/classes/local/entities/course.php