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Informations about the package flattable
Laravel Flattable
It lets you manage de-normalized tables with simple configurations.
Just add array based config in your models and it will automatically sync your denormalized tables.
Introduction
Do you currenlty have de-normalized tables in your laravel application, or planning to have one, this package can help you keep your denormalized tables synced with source tables.
With flattable, you can combine multiple tables into one big table and improve performance by:
Minimizing the need for joins and subqueries, precomputing aggregate values, that is, computing them at data modification time, rather than at select time
You just have to create a flat table, add configuration in related models, and everything will start working automatically.
Installation
Install the package via Composer:
Laravel version Compatibility
Laravel | Package |
---|---|
8.x|php8 | 3.x |
8.x|php7 | 2.x |
<8.x | 1.x |
Usage
- Add
Flattable
trait into your model - Implement
flattableConfig
method and add your configurations
Learn with examples
It is easier to explain it with the help of examples. For more detailed examples, please review the tests
Example DB structure
- We have books, publishers, countries tables
- A book belongs to a publisher
- A publisher belongs to a country
We want data of the book, book's publisher and country of the book's publisher in book's flattable (books_flattable)
As book is main table here, we will add flattable configuration in the book's model, and the type
should be primary
, more on type here.
To explain the problem, we will break our configurations into 3 parts. For detailed configuration for the book, please see first config entry of book's model in tests.
1. Book in book's flattable
also updates/deletes when related book is updated or deleted
in getFlattableConfig()
method of the Book
model
2. Publisher in the book's flattable.
it also updates flattable with new publisher when book's publisher is changed
Extend flattable config used above, and add config for publisher under changes
key.
3. Country of the publisher in book's flattable
you can go as many nested level as you want using changes
attribute, ie changes
attribute within changes
attribute.
With added configuration so far, any change in the book will automatically update the book's flattable. Even if the publisher of the book is changed, the flattable will automatically be updated with new publisher data.
What if publisher itself is updated, ie first_name of the publisher is updated, or the country of publisher is updated. For this we have to implement flattable for the Publisher
and Country
models and add flattable config in both models, and the config type
should be secondary
.
See below
Update book's flattable on publisher update
In flattableConfig()
of the Publisher
model
Update book's flattable on country update
Assigns null values to flattable when country is deleted
In flattableConfig()
of the Country
model
Books in Publisher's flat table
So far we have considered one-to-one relations, book belongs to one publisher, publisher belongs to one country.
What if there is one to many relationship between two tables.
For example, a publisher can have many books, and whenever any book is added, we want to add this book in the publisher's flattble.
Add one more flattable config in Book
model, the config type
for this relation should be many
.
Flattable config explanation
Flattable config has following attributes
1. columns
2. wheres
3. flattable
4. changes
5. type
6. flattable_column_name
7. delete_from_old_keys
8. deletes_primary
1. columns
An array which holds the mapping of flattable columns and source table columns.
Each key in the columns array is the name of the flattable column, and the value is the name of source table column.
2. wheres
An associate array of conditions to map related entry in the flattable.
The key in the sub-array is column name of the flattable and value is column name of the source table.
3. flattable
Name of the flattable.
4. changes
Include related tables data into the flattable. It should be an associate array.
The key of each array in the changes attribute should be the column name of the source table, whose change loads the related data in the flattable.
5. type
It describes the relation type b/w flattable and source table
we have three types
1. primary
create, update, and delete do the same operation for the flattable.
For example, books relation with books_flattable
2. secondary
Same as primary, but deleting model will not delete the related entry in the flattable. Instead it will assign null values to the related columns in the flattable.
For example, publishers relationship with books_flattable.
If publisher of the book is deleted, then the publisher's attributes
in the books_flattable
will be set to null
.
If you want entry in flattable to be delete for
secondary
type, set deletes_primary
flag to true
.
3. many
For one to many relationship. With this type, we can store more than one entries in the flattable.
For example, books relationship with publishers_flattable, one publisher can have more than one books.
6. flattable_column_name
Required when type is many
. It holds the column name of the flattable, where json data will be stored.
7. delete_from_old_keys
Required when type is many
. It holds the names of columns, any change in these columns will reload the related json data of related flattable column.
8. deletes_primary
primary type
automaically deletes entry from the flattable, when entry from the main table is deleted, and
secondary type store null values against related entries in flattable.
If you want that deleting an entry for secondary type also deletes related
flattable entry, set deletes_primary
flag to true.
Configurations
Disable flattable a single model
Disable flattable for all models
Publish flattable config
set disabled
to true
in config/flattabe.php
Disable flattable for console
You can optionally disable flattable when script is running through console,
To disable it set console.run
to false
in config/flattable.php
.
Using callbacks
If none of available options works for your use case, you can pass a callback for columns
and wheres
configs.
For columns
callback, you will receive model as parameter, and you should return data as array to be stored in flattable
For wheres
callback, you will receive QueryBuilder
and Model
as parameters, and you can add as many conditionals as you want.
Fill flattable
You can use flattable:fill
command to fill your flattable.
This command will use primary config of Book
model
and fill the related flattable
All versions of flattable with dependencies
illuminate/support Version >8.0
illuminate/database Version >8.0
illuminate/config Version >8.0