Postgres: Relationships Between Tables/Views/Native Queries
Introduction
To make nested object queries, the tables/views/Native Queries in your database need to be connected via relationships.
Let's say we have the following tables in our database: authors, passport_infos, articles and tags.
Table relationships
The tables/views in any relational database are typically related to each other via one of the following types of table relationships:
| Type | Example | Meaning |
|---|---|---|
one-to-one | owner and passport_infos |
|
one-to-many | authors and articles |
|
many-to-many | articles and tags |
|
GraphQL schema relationships
Each table relationship, as you can see from the above section, will have two component relationships (one in either direction) in the GraphQL schema. These relationships can be one of the following types:
| Type | Example | Meaning |
|---|---|---|
object relationship (one-to-one) | an article can have one author | an article object will have a single nested author object called author |
array relationship (one-to-many) | an author can have many articles | an author object will have an array of nested article objects called articles |
The relationship name is used to refer to the nested objects in queries. For example, "articles" of an author and
"author" of an article.
Managing GraphQL relationships
See the following to manage the object/array relationships between tables/views for the GraphQL schema:
Table relationships modeling guides
The following guides will help you model the different types of table relationships in the database:
