Created
January 31, 2024 18:43
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Validate using one GraphQL schema, but execute using another schema
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| require "bundler/inline" | |
| gemfile do | |
| gem "graphql", "2.2.6" | |
| end | |
| class NewSchema < GraphQL::Schema | |
| class Query < GraphQL::Schema::Object | |
| field :old_field, Integer | |
| def old_field = 1 | |
| field :new_field, Integer | |
| def new_field = 2 | |
| end | |
| query(Query) | |
| end | |
| OldSchema = GraphQL::Schema.from_definition <<-SCHEMA | |
| type Query { | |
| oldField: Int | |
| } | |
| SCHEMA | |
| def run_as_if_old_schema(query_str) | |
| # IRL this would be in your controller, for example | |
| validation_errs = OldSchema.validate(query_str) | |
| if validation_errs.any? | |
| { | |
| errors: validation_errs.map(&:to_h) | |
| } | |
| else | |
| NewSchema.execute(query_str, validate: false) | |
| end | |
| end | |
| pp run_as_if_old_schema("{ oldField }").to_h | |
| # {"data"=>{"oldField"=>1}} | |
| pp run_as_if_old_schema("{ newField }").to_h | |
| # {:errors=> | |
| # [{"message"=>"Field 'newField' doesn't exist on type 'Query'", | |
| # "locations"=>[{"line"=>1, "column"=>3}], | |
| # "path"=>["query", "newField"], | |
| # "extensions"=>{"code"=>"undefinedField", "typeName"=>"Query", "fieldName"=>"newField"}}]} |
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