Phases of Execution

When GraphQL receives a query string, it goes through these steps:

• Tokenize: GraphQL::Language::Lexer splits the string into a stream of tokens
• Parse: GraphQL::Language::Parser builds an abstract syntax tree (AST) out of the stream of tokens
• Validate: GraphQL::StaticValidation::Validator validates the incoming AST as a valid query for the schema
• Rewrite: GraphQL::InternalRepresentation::Rewrite builds a tree of GraphQL::InternalRepresentation::Nodes which express the query in a simpler way than the AST
• Analyze: If there are any query analyzers, they are run with GraphQL::Analysis.analyze_query
• Execute: The query is traversed, resolve functions are called and the response is built
• Respond: The response is returned as a Hash