| // @flow strict |
| |
| import inspect from '../../jsutils/inspect'; |
| |
| import { GraphQLError } from '../../error/GraphQLError'; |
| |
| import { type FieldNode } from '../../language/ast'; |
| import { type ASTVisitor } from '../../language/visitor'; |
| |
| import { getNamedType, isLeafType } from '../../type/definition'; |
| |
| import { type ValidationContext } from '../ValidationContext'; |
| |
| /** |
| * Scalar leafs |
| * |
| * A GraphQL document is valid only if all leaf fields (fields without |
| * sub selections) are of scalar or enum types. |
| */ |
| export function ScalarLeafsRule(context: ValidationContext): ASTVisitor { |
| return { |
| Field(node: FieldNode) { |
| const type = context.getType(); |
| const selectionSet = node.selectionSet; |
| if (type) { |
| if (isLeafType(getNamedType(type))) { |
| if (selectionSet) { |
| const fieldName = node.name.value; |
| const typeStr = inspect(type); |
| context.reportError( |
| new GraphQLError( |
| `Field "${fieldName}" must not have a selection since type "${typeStr}" has no subfields.`, |
| selectionSet, |
| ), |
| ); |
| } |
| } else if (!selectionSet) { |
| const fieldName = node.name.value; |
| const typeStr = inspect(type); |
| context.reportError( |
| new GraphQLError( |
| `Field "${fieldName}" of type "${typeStr}" must have a selection of subfields. Did you mean "${fieldName} { ... }"?`, |
| node, |
| ), |
| ); |
| } |
| } |
| }, |
| }; |
| } |