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73 lines
2.2 KiB
73 lines
2.2 KiB
import { inspect } from '../../jsutils/inspect.mjs'; |
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import { GraphQLError } from '../../error/GraphQLError.mjs'; |
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import { isCompositeType } from '../../type/definition.mjs'; |
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import { doTypesOverlap } from '../../utilities/typeComparators.mjs'; |
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import { typeFromAST } from '../../utilities/typeFromAST.mjs'; |
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/** |
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* Possible fragment spread |
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* |
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* A fragment spread is only valid if the type condition could ever possibly |
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* be true: if there is a non-empty intersection of the possible parent types, |
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* and possible types which pass the type condition. |
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*/ |
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export function PossibleFragmentSpreadsRule(context) { |
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return { |
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InlineFragment(node) { |
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const fragType = context.getType(); |
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const parentType = context.getParentType(); |
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if ( |
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isCompositeType(fragType) && |
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isCompositeType(parentType) && |
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!doTypesOverlap(context.getSchema(), fragType, parentType) |
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) { |
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const parentTypeStr = inspect(parentType); |
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const fragTypeStr = inspect(fragType); |
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context.reportError( |
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new GraphQLError( |
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`Fragment cannot be spread here as objects of type "${parentTypeStr}" can never be of type "${fragTypeStr}".`, |
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{ |
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nodes: node, |
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}, |
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), |
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); |
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} |
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}, |
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FragmentSpread(node) { |
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const fragName = node.name.value; |
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const fragType = getFragmentType(context, fragName); |
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const parentType = context.getParentType(); |
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if ( |
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fragType && |
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parentType && |
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!doTypesOverlap(context.getSchema(), fragType, parentType) |
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) { |
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const parentTypeStr = inspect(parentType); |
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const fragTypeStr = inspect(fragType); |
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context.reportError( |
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new GraphQLError( |
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`Fragment "${fragName}" cannot be spread here as objects of type "${parentTypeStr}" can never be of type "${fragTypeStr}".`, |
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{ |
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nodes: node, |
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}, |
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), |
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); |
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} |
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}, |
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}; |
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} |
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function getFragmentType(context, name) { |
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const frag = context.getFragment(name); |
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if (frag) { |
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const type = typeFromAST(context.getSchema(), frag.typeCondition); |
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if (isCompositeType(type)) { |
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return type; |
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} |
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} |
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}
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