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Laravel Import

• Installation
• Usage
  • Defining Importable Models
  • Defining Source Map
  • Supported Methods / Built in logic
  • Looping
  • Context Functions
• Extendability
• Configuration

This package allows you to do data import into Laravel application. This package uses json format source-maps where you define mapping between source data and expected database structure.

Running a command

Package uses artisan commands to run the import commands for their respective source conversion drivers.

These commands will load source-map file from storage path and will attempt at processing passed data to given data.

Installation

This package is compatible with Laravel 5.5 or higher. You can install the package via composer using the following command:

Whilst Laravel 5.4 or below is not officially supported the functionality should work if the service provider is registered. This can be done by just adding the service provider in config/app.php file:

Usage

Import functionality is called by artisan commands for the respective driver.

Defining Importable Models

To allow data import on a model you will need to add Mtc\Import\Traits\Importable trait to your Eloquent models.

This will provide the additional methods to the models for importing.

To see what fields are allowed to be imported the package will look for $importable attribute on Model. This attribute should define the columns that can be populated. If the $importable field is not defined on the model it will fall back to using $fillable as basis for importable columns. If model does not use $fillable attribute it will use the last resort of connecting to database and allowing all columns.

It is also possible to define the fallback values on the model columns to ensure the correct data type is set for the attributes using $importable_defaults attribute on model

As for importing related models the package will expect $importable_relationships attribute to be present. If this attribute will not be set it will not allow importing the relationships even if they are part of the source map. Importable relationships should follow the below example.

Defining Source Map

Source file must be defined before doing import and should follow the outlined example:

The source map is split into 3 top level objects:

• model - defines the data model that will be base for populating data
• query - only required on database models. Defines data structure to allow loading data from multiple tables without the necessity of creating models for the data on the import side
• data_map - mapping between the fields on current application and their respective fields on the import data structure

Supported methods / built-in logic

Since data rarely transfers from one structure to a different one in one-to-one fashion there are some methods that are built in to help with the data migration.

Looping

Large requirement for importing data usually is processing normalized data with children entries. Rather than creating a separate import map and processing for these child entries this package allows processing looped data (e.g. item with multiple images).

By default package uses * symbol to identify looped item, however this can be changed in the import config. When using looped structure the relation will go through all possible entries and create child entries for them. NB This functionality supports only data-fetching from same structure, it will not allow loading data from two different data loops

Context Functions

The import engine uses context functions that are simply identified by using tilde symbol before its name and wrapping attributes in parenthesis resulting in the following format: ~function().
Currently following context functions are supported:

• ~compare(field,compare_value,compare_operator,true_value,false_value) - allows comparing values. Checks field against compare_value using compare_operator. Returns true_value or false_value based on comparison result.
• ~int() - casts value to integer
• ~float() - casts value to float
• ~now(format) - returns Carbon::now(format) timestamp. format is optional and will use default to string timestamp if omitted.
• ~concat(argument1,argument2) - will concatenate list of arguments together. Supports unrestricted amount of arguments
• ~external(class_name,method_name,arguments) - allows passing data to external script to resolve custom mapping. This when calling method it will pass the $data attribute (which holds current data structure) alongside the list of arguments.

Extendability

Main options for extending the functionality is during the mapping process. This can be done by mapping field against the ~external() method that allows calling methods for parsing data values.

Configuration

This package offers 2 config files (database.php and import.php).

database.php extends the main database config by adding a new connection for import source. This source is used for database import flow.

import.php offers configuration options for the package like changing the import file paths in storage directory, defining db chunk sizes or changing the loop operator symbol.

Contributing

Please see CONTRIBUTING for details.

Security

If you discover any security-related issues, please email [email protected] instead of using the issue tracker.

License

The GNU General Purpose License (GPL). Please see License File for more information.