GraphQL Crash Course #4 - Schema & Types

TL;DR

Type definitions in GraphQL define the different types of data and their relationships, which combine to form a schema that describes the shape of the data available on the graph.

Transcript

all right then my friends so now we're gonna make some type definitions and then later on as well some resolver functions which we can then pass into the Apollo server so it can do its magic with them so let's start with the type defs what are type defs well type defs are definitions of the different types of data we want to expose on our graph for... Read More

Key Insights

• 🅰️ Type definitions in GraphQL define the fields and properties of each data type.
• 💁 The combination of type definitions and their relationships forms a schema that represents the overall structure of the GraphQL graph.
• 🧑‍🏭 The GraphQL schema typically aligns with the application's database structure but can differ as GraphQL acts as a layer between the database and client-side queries.
• 😥 The query type specifies the entry points to the graph, determining where users can start their queries.
• 📈 Type definitions and schemas are crucial in determining the data available and the structure of the GraphQL graph.
• 🍵 The Apollo server requires both type definitions and resolver functions to handle queries and return data.
• 🅰️ Type definitions can be enhanced with custom types built on top of the scalar types provided by GraphQL.

Questions & Answers

Q: What are type definitions in GraphQL?

Type definitions in GraphQL specify the different fields and properties for each data type, defining the structure and shape of the data available on the graph.

Q: How are type definitions used to build a schema?

Type definitions define the types of data that can be exposed on the GraphQL graph. When combined with the relationships between these types and the defined entry points, they form a schema that represents the overall structure of the graph.

Q: Can the GraphQL schema differ from the application database's data structure?

While the GraphQL schema typically aligns closely with the application database's structure, it doesn't have to match exactly. GraphQL acts as a layer between the database and client-side queries, allowing some flexibility in how the data is represented.

Q: What is the purpose of the query type in GraphQL?

The query type specifies the entry points to the GraphQL graph, allowing users to retrieve data starting from these defined query entry points. It acts as a gatekeeper, determining where users can jump into the graph initially.

Key Insights:

• Type definitions in GraphQL define the fields and properties of each data type.
• The combination of type definitions and their relationships forms a schema that represents the overall structure of the GraphQL graph.
• The GraphQL schema typically aligns with the application's database structure but can differ as GraphQL acts as a layer between the database and client-side queries.
• The query type specifies the entry points to the graph, determining where users can start their queries.
• Type definitions and schemas are crucial in determining the data available and the structure of the GraphQL graph.
• The Apollo server requires both type definitions and resolver functions to handle queries and return data.
• Type definitions can be enhanced with custom types built on top of the scalar types provided by GraphQL.
• Syntax highlighting packages can improve the readability and ease of writing type definitions.

Summary & Key Takeaways

• Type definitions in GraphQL specify the different fields and properties for each data type, like an author's name, avatar URL, and bio, or a game's title, price, and platform.

• The combination of all the type definitions and their relationships forms a schema that represents the shape of the graph and the available data.

• The GraphQL schema typically aligns closely with the data stored in the application's database, although it can differ since GraphQL acts as a layer between the database and client-side queries.