R6 class representing a data source

R6 class representing a data source

R6 class representing a data source

Details

Source is an object storing information about data source such as source type, primary keys and relations between stored data.

Public fields

dtconn

Data connection object the Source if based on.

description

Source object description list.

attributes

Extra source parameters passed when source is defined.

options

Extra configuration options.

binding_keys

Source data relations expressed as binding-keys.

primary_keys

Source data primary keys expressed as primary_keys.

source_code

An expression which allows to recreate basic source structure.

Methods

Public methods

• Source$new()

• Source$get()

• Source$get_steps()

• Source$add_step()

• Source$rm_step()

• Source$add_filter()

• Source$rm_filter()

• Source$update_filter()

• Source$clone()

---

Method new()

Create a new `Source` object.

Usage

Source$new(
  dtconn,
  ...,
  primary_keys = NULL,
  binding_keys = NULL,
  source_code = NULL,
  description = NULL,
  options = list(display_binding = TRUE)
)

Arguments

dtconn

An object defining source data connection.

...

Extra Source parameters. Stored within `attributes` field.

primary_keys

Definition of data `primary_keys`, if appropriate. See primary_keys.

binding_keys

Definition of relations between data, if appropriate. See binding-keys.

source_code

A quote object that allows to recreate basic source structure. Used as a part of reproducible code output, see code.

description

A named list storing the source objects description. Can be accessed with description Cohort method.

options

List of options affecting methods output. Currently supported only `display_binding` specifying whether reproducible code should include bindings definition.

Returns

A new `Source` object of class `Source` (and `dtconn` object class appended).

---

Method get()

Get selected `Source` object `attribute`.

Usage

Source$get(param)

Arguments

param

Name of the attribute.

---

Method get_steps()

Returns filtering steps definition, if defined for `Source`.

Usage

Source$get_steps()

---

Method add_step()

Add filtering step definition.

Usage

Source$add_step(step)

Arguments

step

Step definition created with step.

---

Method rm_step()

Remove filtering step definition.

Usage

Source$rm_step(step_id)

Arguments

step_id

Id of the step to be removed.

---

Method add_filter()

Add filter definition to selected step.

Usage

Source$add_filter(filter, step_id)

Arguments

filter

Filter definition created with filter.

step_id

Id of the step to include the filter to. If skipped the last step is used.

---

Method rm_filter()

Remove filter definition from selected step.

Usage

Source$rm_filter(step_id, filter_id)

Arguments

step_id

Id of the step where filter is defined.

filter_id

Id of the filter to be removed.

---

Method update_filter()

Update filter definition.

Usage

Source$update_filter(step_id, filter_id, ...)

Arguments

step_id

Id of the step where filter is defined.

filter_id

Id of the filter to be updated.

...

Parameters with its new values.

---

Method clone()

The objects of this class are cloneable with this method.

Usage

Source$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.