These different data sets all tie into one another in various different ways with the scheduling and shift module sharing a context. We build a user module, a shift module, a companies module and a scheduling module. In this tutorial, we build a small scheduler app that mainly serves to show the various different ways that we can use Phoenix Contexts and Ecto to our advantage. Because Elixir is a dynamic programming language, it does not make use of a strong type system and as such, libraries like Ecto are powerful allies to keeping our functions and programs pure and functional. Data provided by the user can be type converted and properly validated before it is inserted into your database/datastore. These Ecto Schemas also give us access to Ecto Changeset which allow us to filter, cast, define and validate our datasets in a functional pipeline style. For instance, if you are using a database that does not support the autoincrementing of primary keys you can configure and use various modules to have elixir handle these tasks. Ecto is its main library for working with databases, providing us. These schemas also expose functionality that might not be found in the database or data layer that you are working on. Elixir is a modern, dynamic, functional programming language used to build highly distributed and fault-tolerant applications. These Schemas let us map our data into any source using an Elixir struct (in this case we are using PostgreSQL). Contexts are modules that expose and group related functionality which allows the user to build their application in a data driven way.Īt the center of these new encapsulation patterns are Ecto Schemas. Create and migrate your database with mix tup Install Node.js depe. One of the biggest changes is its bound context data model. Ex shop - Elixir Similar Projects List - Digital goods shop & blog created. Alchemists in various ages and cultures sought the means of formulating the elixir. Phoenix 1.3 brings many really cool features with it. The elixir of life, also known as elixir of immortality and sometimes equated with the name philosophers stone, is a potion that supposedly grants the drinker eternal life and/or eternal youth. When no prefix is set, Postgres queries are assumed to be executed in the public schema, while MySQL queries are assumed to be executed in the database set in the config for the repo.įor example, if we want to insert a new element in our database with Repo.Phoenix is mainly just a web interface on top of your basic elixir application but it still gives us some great abstractions and it ties very well into Ecto (the database back end library). According to the documentation, for Postgres users, prefix will specify the schema where the table is located, while for MySQL users will specify the database where the table is located. Most of the methods provided by Ecto which directly interacts with the database have a series of options, in which the most important one for multi-tenancy is prefix. Furthermore, it handles rollbacks, provides results on either success or error, flattens-out nested code and. See the getting started guide and the online documentation for more information. Ecto is also commonly used to map data from any source into Elixir structs, whether they are backed by a database or not. Ecto.Multi is a set of utilities aimed at composing and executing atomic operations, usually (but not always, as you’ll see soon) performed against the database. Ecto is commonly used to interact with databases, such as PostgreSQL and MySQL via ( source code ). Some time ago I had to tackle the migration of an application with a regular database to a multi-tenancy one, and I would like to share my experience here.ĭespite the existence of libraries like apartmentex, triplex or tenantex, I wanted to make the migration as dependency free as possible, so I made my own management for the multi-tenancy. Learn how to compose and execute batches of queries using Ecto.Multi.
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