core\analytics\analyser\courses Class Reference

Courses analyser working at course level (insights for the course teachers). More...

Inheritance diagram for core\analytics\analyser\courses:

Public Member Functions
	add_log ($string)
	Adds a register to the analysis log.
	check_indicator_requirements (\core_analytics\local\indicator\base $indicator)
	Checks that this analyser satisfies the provided indicator requirements.
	get_all_samples (\core_analytics\analysable $course)
	This will return just one course as we analyse 'by_course'.
	get_all_samples (\core_analytics\analysable $analysable)
	This function returns this analysable list of samples.
	get_analysables ()
	get_analysables_iterator (?string $action=null, array $contexts=[])
	Return the list of courses to analyse.
	get_indicators ()
	Getter for indicators.
	get_labelled_data (array $contexts=[])
	Returns labelled data (training and evaluation).
	get_logs ()
	Returns the analysis logs.
	get_modelid ()
	Model id getter.
	get_options ()
	Options getter.
	get_sample_analysable ($sampleid)
	Returns the analysable of a sample.
	get_samples ($sampleids)
	Returns samples data from sample ids.
	get_samples_origin ()
	Samples origin is course table.
	get_static_data (array $contexts=[])
	Returns indicator calculations as an array.
	get_target ()
	Returns the analysed target.
	get_timesplittings ()
	Getter for time splittings.
	get_unlabelled_data (array $contexts=[])
	Returns unlabelled data (prediction).
	instantiate_indicators ()
	Instantiate the indicators.
	join_sample_user ($sampletablealias)
	SQL JOIN from a sample to users table.
	processes_user_data ()
	Whether the plugin needs user data clearing or not.
	sample_access_context ($sampleid)
	Returns the context of a sample.
	sample_description ($sampleid, $contextid, $sampledata)
	Returns the sample description.

Static Public Member Functions
static	context_restriction_support ()
	Can be limited to course categories or specific courses.
static	one_sample_per_analysable ()
	Just one sample per analysable.
static	potential_context_restrictions (string $query=null)
	Returns the possible contexts used by the analyser.

Protected Member Functions
	check_indicators_requirements ()
	Checks if the analyser satisfies all the model indicators requirements.
	get_iterator_sql (string $tablename, int $contextlevel, ?string $action=null, ?string $tablealias=null, array $contexts=[])
	Get the sql of a default implementation of the iterator.
	order_sql (?string $fieldname=null, string $order='ASC', ?string $tablealias=null)
	Returns the order by clause.
	provided_sample_data ()
	This provides samples' course and context.

Protected Attributes
core_analytics local indicator base[]	$indicators
	The model indicators.
string[]	$log
	Simple log array.
int	$modelid
array	$options
	Execution options.
core_analytics local target base	$target
	The model target.
core_analytics local time_splitting base[]	$timesplittings
	Time splitting methods to use.

Detailed Description

Courses analyser working at course level (insights for the course teachers).

Copyright

2017 David Monllao

License

http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

Member Function Documentation

add_log()

core_analytics\local\analyser\base::add_log ( $string )

inherited

Adds a register to the analysis log.

Parameters

string

$string

Return values

void

check_indicator_requirements()

core_analytics\local\analyser\base::check_indicator_requirements ( \core_analytics\local\indicator\base $indicator )

inherited

Checks that this analyser satisfies the provided indicator requirements.

Parameters

core_analytics\local\indicator\base

$indicator

Return values

true|string[]

True if all good, missing requirements list otherwise

check_indicators_requirements()

core_analytics\local\analyser\base::check_indicators_requirements ( )

protectedinherited

Checks if the analyser satisfies all the model indicators requirements.

Exceptions

core_analytics\requirements_exception

Return values

void

context_restriction_support()

static core_analytics\local\analyser\by_course::context_restriction_support ( )

staticinherited

Can be limited to course categories or specific courses.

Return values

array

Reimplemented from core_analytics\local\analyser\base.

get_all_samples() [1/2]

core\analytics\analyser\courses::get_all_samples

(

\core_analytics\analysable

$course

)

This will return just one course as we analyse 'by_course'.

Parameters

core_analytics\analysable

$course

Return values

array

get_all_samples() [2/2]

core_analytics\local\analyser\base::get_all_samples ( \core_analytics\analysable $analysable )

abstractinherited

This function returns this analysable list of samples.

Parameters

core_analytics\analysable

$analysable

Return values

array

array[0] = int[] (sampleids) and array[1] = array (samplesdata)

get_analysables()

core_analytics\local\analyser\base::get_analysables ( )

inherited

Deprecated

since Moodle 3.7

get_analysables_iterator()

core_analytics\local\analyser\by_course::get_analysables_iterator ( ?string $action = null, array $contexts = [] )

inherited

Return the list of courses to analyse.

Parameters

string | null	$action	'prediction', 'training' or null if no specific action needed.
context[]	$contexts	Only analysables that depend on the provided contexts. All analysables in the system if empty.

Return values

Iterator

Reimplemented from core_analytics\local\analyser\base.

get_indicators()

core_analytics\local\analyser\base::get_indicators ( )

inherited

Getter for indicators.

Return values

core_analytics\local\indicator\base

get_iterator_sql()

core_analytics\local\analyser\base::get_iterator_sql ( string $tablename, int $contextlevel, ?string $action = null, ?string $tablealias = null, array $contexts = [] )

protectedinherited

Get the sql of a default implementation of the iterator.

This method only works for analysers that return analysable elements which ids map to a context instance ids.

Parameters

string	$tablename	The name of the table
int	$contextlevel	The context level of the analysable
string | null	$action
string | null	$tablealias	The table alias
context[]	$contexts	Only analysables that depend on the provided contexts. All analysables if empty.

Return values

array

[0] => sql and [1] => params array

get_labelled_data()

core_analytics\local\analyser\base::get_labelled_data ( array $contexts = [] )

inherited

Returns labelled data (training and evaluation).

Parameters

context[]

$contexts

Restrict the analysis to these contexts. No context restrictions if null.

Return values

stored_file[]

get_logs()

core_analytics\local\analyser\base::get_logs ( )

inherited

Returns the analysis logs.

Return values

string[]

get_modelid()

core_analytics\local\analyser\base::get_modelid ( )

inherited

Model id getter.

Return values

int

get_options()

core_analytics\local\analyser\base::get_options ( )

inherited

Options getter.

Return values

array

get_sample_analysable()

core\analytics\analyser\courses::get_sample_analysable

(

$sampleid

)

Returns the analysable of a sample.

Parameters

int

$sampleid

Return values

core_analytics\analysable

Reimplemented from core_analytics\local\analyser\base.

get_samples()

core\analytics\analyser\courses::get_samples

(

$sampleids

)

Returns samples data from sample ids.

Parameters

int[]

$sampleids

Return values

array

Reimplemented from core_analytics\local\analyser\base.

get_samples_origin()

core\analytics\analyser\courses::get_samples_origin

(

)

Samples origin is course table.

Return values

string

Reimplemented from core_analytics\local\analyser\base.

get_static_data()

core_analytics\local\analyser\base::get_static_data ( array $contexts = [] )

inherited

Returns indicator calculations as an array.

Parameters

context[]

$contexts

Restrict the analysis to these contexts. No context restrictions if null.

Return values

array

get_target()

core_analytics\local\analyser\base::get_target ( )

inherited

Returns the analysed target.

Return values

core_analytics\local\target\base

get_timesplittings()

core_analytics\local\analyser\base::get_timesplittings ( )

inherited

Getter for time splittings.

Return values

core_analytics\local\time_splitting\base

get_unlabelled_data()

core_analytics\local\analyser\base::get_unlabelled_data ( array $contexts = [] )

inherited

Returns unlabelled data (prediction).

Parameters

context[]

$contexts

Restrict the analysis to these contexts. No context restrictions if null.

Return values

stored_file[]

instantiate_indicators()

core_analytics\local\analyser\base::instantiate_indicators ( )

inherited

Instantiate the indicators.

Return values

core_analytics\local\indicator\base[]

join_sample_user()

core_analytics\local\analyser\base::join_sample_user ( $sampletablealias )

inherited

SQL JOIN from a sample to users table.

This function should be defined if static\processes_user_data returns true and it is related to analytics API privacy API implementation. It allows the analytics API to identify data associated to users that needs to be deleted or exported.

This function receives the alias of a table with a 'sampleid' field and it should return a SQL join with static\get_samples_origin and with 'user' table. Note that:

• The function caller expects the returned 'user' table to be aliased as 'u' (defacto standard in moodle).
• You can join with other tables if your samples origin table does not contain a 'userid' field (if that would be a requirement this solution would be automated for you) you can't though use the following aliases: 'ap', 'apa', 'aic' and 'am'.

Some examples:

static\get_samples_origin() === 'user': JOIN {user} u ON {$sampletablealias}.sampleid = u.id

static\get_samples_origin() === 'role_assignments': JOIN {role_assignments} ra ON {$sampletablealias}.sampleid = ra.userid JOIN {user} u ON u.id = ra.userid

static\get_samples_origin() === 'user_enrolments': JOIN {user_enrolments} ue ON {$sampletablealias}.sampleid = ue.userid JOIN {user} u ON u.id = ue.userid

Exceptions

coding_exception

Parameters

string

$sampletablealias

The alias of the table with a sampleid field that will join with this SQL string

Return values

string

Reimplemented in core\analytics\analyser\student_enrolments, and core\analytics\analyser\users.

one_sample_per_analysable()

static core\analytics\analyser\courses::one_sample_per_analysable ( )

static

Just one sample per analysable.

Return values

bool

Reimplemented from core_analytics\local\analyser\base.

order_sql()

core_analytics\local\analyser\base::order_sql ( ?string $fieldname = null, string $order = 'ASC', ?string $tablealias = null )

protectedinherited

Returns the order by clause.

Parameters

string | null	$fieldname	The field name
string	$order	'ASC' or 'DESC'
string | null	$tablealias	The table alias of the field

Return values

string

potential_context_restrictions()

static core_analytics\local\analyser\base::potential_context_restrictions ( string $query = null )

staticinherited

Returns the possible contexts used by the analyser.

This method uses separate logic for each context level because to iterate through the list of contexts calling get_context_name for each of them would be expensive in performance terms.

This generic implementation returns all the contexts in the site for the provided context level. Overwrite it for specific restrictions in your analyser.

Parameters

string | null

$query

Context name filter.

Return values

int[]

processes_user_data()

core_analytics\local\analyser\base::processes_user_data ( )

inherited

Whether the plugin needs user data clearing or not.

This is related to privacy. Override this method if your analyser samples have any relation to the 'user' database entity. We need to clean the site from all user-related data if a user request their data to be deleted from the system. A static\provided_sample_data returning 'user' is an indicator that you should be returning true.

Return values

bool

Reimplemented in core\analytics\analyser\student_enrolments, and core\analytics\analyser\users.

provided_sample_data()

core\analytics\analyser\courses::provided_sample_data ( )

protected

This provides samples' course and context.

Return values

string[]

Reimplemented from core_analytics\local\analyser\base.

sample_access_context()

core\analytics\analyser\courses::sample_access_context

(

$sampleid

)

Returns the context of a sample.

Parameters

int

$sampleid

Return values

context

Reimplemented from core_analytics\local\analyser\base.

sample_description()

core\analytics\analyser\courses::sample_description	(		$sampleid,
			$contextid,
			$sampledata )

Returns the sample description.

Parameters

int	$sampleid
int	$contextid
array	$sampledata

Return values

array

array(string, renderable)

Reimplemented from core_analytics\local\analyser\base.

Member Data Documentation

$timesplittings

core_analytics local time_splitting base [] core_analytics\local\analyser\base::$timesplittings

protectedinherited

Time splitting methods to use.

Multiple time splitting methods during evaluation and 1 single time splitting method once the model is enabled.

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The documentation for this class was generated from the following file:

• lib/classes/analytics/analyser/courses.php