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Building Database Applications in Elixir with Ecto

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Introduction to This Course

Why Ecto?Course Plan

Part I: Ecto Fundamentals

Overview of Part I

Get Started with Repo

Ecto and Elixir Characteristics of Ecto Ecto Modules Set Up the Sample Application Running the Examples Data Model of the Sample Application The Repository Pattern The Repo Module Put Our Repo to Work Get Values Back Execute Queries Customize Your Repo Wrapping Up: Get Started with Repo Exercise: Customize Your Repo Module Solution: Customize Your Repo Module Quiz: Get Started with Repo

Query Your Database

Introduction to the Query Module Query Basics Refine Our Results with the Where Expression Protect Against SQL Injection Dynamic Values and Their Types Query Bindings Insert Raw SQL Combine Results with union and union_all Options Order and Group Work With Joins Why Use the Composing Queries Named Bindings Compose Queries with Functions Combine Queries with or_where Other Ways to Use Queries Wrapping Up: Query Your Database Exercise: Create Queries in Ecto Solution: Create Queries in Ecto Quiz: Query Your Database

Connect Tables to Elixir Structs with Schemas

Introduction to Schemas Create Schemas How to Write Queries with Schemas Insert with Schemas Delete with Schemas Add Associations to Schemas Many-to-Many Associations Work with Associations in Queries Optimize Associations With Embedded Schemas Delete Records With Associations Use Schemas to Seed a Database Wrapping Up: Connect Tables to Elixir Structs with Schemas Exercise: Create Schemas in Ecto Solution: Create Schemas in Ecto Quiz: Connect Tables to Elixir Structs with Schema

Make Changes with Changesets

Introduction to Changesets Cast and Filter Validate Your Data Work with Constraints Capture Errors Use Changesets Without Schemas Work with Associations Associations Using Internal Data Associations Using External Data Update Records with Associations Best Practices for Associations Wrapping Up: Make Changes with Changesets Exercise: Create Changesets in Ecto Solution: Create Changesets in Ecto Quiz: Make Changes with Changesets

Make Multiple Changes with Transactions and the Multi Module

Introduction to Transactions and the Multi Module Run Transactions with Functions Force a Rollback Within a Transaction Execute Non-Database Operations Within a Transaction Drawbacks of Using Functions Run Transactions and Capturing Errors with Ecto.Multi Optimize Multi with Changesets Execute Non-Database Operations with Multi Wrapping Up: Make Multiple Changes with Transactions Exercise: Work with Transactions and the Multi Module Solution: Work with Transactions and the Multi Module Quiz: Make Multiple Changes

Make Changes to the Database

What are Migrations?Your First Migration Run Migrations Add Indexes Change Data and Table Structure Simultaneously Specify Up and Down Operations Change Default Behaviors Change Timestamps Run Migrations Outside of a Transaction Wrapping Up: Make Changes to Your Database Exercise: Create Migrations Solution: Create Migrations Quiz: Make Changes to your Database

Part II: Ecto Applied

Overview of Part II

Add Ecto to an Elixir Application Without Phoenix

Ecto in Elixir Applications: An Introduction Create a New Project Create Your Repo Module Add Ecto to the Supervision Tree Use Multiple Ecto Repos Start Your App Wrapping Up: Add Ecto to an Elixir Application Without Phoenix Quiz: Add Ecto to an App without Phoenix

Work with Changesets and Phoenix Forms

Ecto and Phoenix Forms: An Introduction Generate a Form for a Single Schema Display Changeset Errors Create a Form with an Association Create a Form with Multiple Associations Wrapping Up: Work Changesets and Phoenix Forms Quiz: Work with Changesets and Phoenix Forms

Test with Sandboxes

Introduction to Sandboxes Set Up an Async Test Change the Ownership Mode Safely Share Connections with Allowances Wrapping Up: Test with Sandboxes Quiz: Test with Sandboxes

Create and Use Custom Types

Introduction to Custom Types in Ecto Building on Top of Ecto’s Types Adding Custom Types Without the Built-In Types Wrapping Up: Creating and Using Custom Types Quiz: Creating and Using Custom Types

Inserting and Updating with Upserts

Introduction to Upserts

Perform Upserts Without Schemas

Perform Upserts with Schemas

Wrapping Up: Insert and Update with Upserts

Exercise: Use Ecto's Upsert Feature

Solution: Use Ecto's Upsert Feature

Quiz: Insert and Update with Upserts

Optimizeing Your Application Design

Introduction to Optimized Application Design Separate the Pure Code from the Impure Code Work with Context Work with Umbrella Applications Wrapping Up: Optimize Your Application Design Quiz: Optimize Your Application Design

Work with Embedded Schemas

Introduction to Embedded Schemas Create Embedded Schemas Make Changes Choose Between Embedded Schemas and Associations Wrapping Up: Work with Embedded Schemas Quiz: Work with Embedded Schemas

Creating Polymorphic Associations

Introduction to Polymorphic Associations Polymorphism in Other Frameworks Approach #1: Multiple Foreign Keys Approach #2: Use an Abstract Schema Approach #3: Use many_to_many Wrapping Up: Create Polymorphic Associations Quiz: Creating Polymorphic Associations

Optimize IEx for Ecto

Introduction to Optimizing IEx for Ecto Add Imports and Aliases Add Helper Functions Wrapping Up: Optimize IEx for Ecto Quiz: Optimize IEx for Ecto

Use Schemas Without Tables

Introduction to Schemas Without Tables Schemas and Tables Create Table-less Schemas Save the Table-less Structs Wrapping Up: Use Schemas Without Tables Quiz: Use Schemas Without Tables

Tune for Performance

Introduction to Performance Tuning Optimization Execute Bulk Operations Fetch Large Datasets With Streams Wrapping Up: Tune for Performance Quiz: Tune for Performance

Conclusion

Closing Thoughts

Wrapping Up: Insert and Update with Upserts

Review what we have learned about inserting and updating with upserts.

We'll cover the following

Key takeaways

Upserts are a great option when we have a data loading process, like inserting the contents of a CSV file that we want to be safely repeatable. However, our data source must have at least one column with a unique index. Our genres table is ideal, as we have a unique index on the name column. If our unique column is the primary key, though, upserts may not be the right option—it would be unusual for the key to appear in a CSV file.

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