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feat(transforms): add HoistField transform
New HoistField transform allows moving a field on a remote type into a higher level object within the wrapping schema. The appendFields and filterFields methods from the WrapFIelds transform have been moved to the utils directory and exported; filterFields has been renamed to removeFields to better describe what it does.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| /* tslint:disable:no-unused-expression */ | ||
|
|
||
| import { | ||
| GraphQLSchema, | ||
| GraphQLObjectType, | ||
| getNullableType, | ||
| } from 'graphql'; | ||
| import { Request } from '../Interfaces'; | ||
| import { Transform } from './transforms'; | ||
| import { healSchema, wrapFieldNode, renameFieldNode } from '../utils'; | ||
| import { createMergedResolver } from '../stitching'; | ||
| import { default as MapFields } from './MapFields'; | ||
| import { appendFields, removeFields } from '../utils/fields'; | ||
|
|
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| export default class HoistField implements Transform { | ||
| private typeName: string; | ||
| private path: Array<string>; | ||
| private newFieldName: string; | ||
| private pathToField: Array<string>; | ||
| private oldFieldName: string; | ||
| private delimeter: string; | ||
| private transformer: Transform; | ||
|
|
||
| constructor( | ||
| typeName: string, | ||
| path: Array<string>, | ||
| newFieldName: string, | ||
| delimeter: string = '__gqltf__', | ||
| ) { | ||
| this.typeName = typeName; | ||
| this.path = path; | ||
| this.newFieldName = newFieldName; | ||
| this.delimeter = delimeter; | ||
|
|
||
| this.pathToField = this.path.slice(); | ||
| this.oldFieldName = this.pathToField.pop(); | ||
| this.transformer = new MapFields({ | ||
| [typeName]: { | ||
| [newFieldName]: fieldNode => wrapFieldNode( | ||
| renameFieldNode(fieldNode, this.oldFieldName), | ||
| this.pathToField, | ||
| this.delimeter | ||
| ), | ||
| }, | ||
| }); | ||
| } | ||
|
|
||
| public transformSchema(schema: GraphQLSchema): GraphQLSchema { | ||
| const typeMap = schema.getTypeMap(); | ||
|
|
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| const innerType: GraphQLObjectType<any, any> = this.pathToField.reduce( | ||
| (acc, pathSegment) => | ||
| getNullableType(acc.getFields()[pathSegment].type) as GraphQLObjectType<any, any>, | ||
| typeMap[this.typeName] as GraphQLObjectType<any, any> | ||
| ); | ||
|
|
||
| const targetField = removeFields( | ||
| typeMap, | ||
| innerType.name, | ||
| fieldName => fieldName === this.oldFieldName, | ||
| )[this.oldFieldName]; | ||
|
|
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| const targetType = (targetField.type as GraphQLObjectType<any, any>); | ||
|
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| appendFields(typeMap, this.typeName, { | ||
| [this.newFieldName]: { | ||
| type: targetType, | ||
| resolve: createMergedResolver({ fromPath: this.pathToField, delimeter: this.delimeter }), | ||
| }, | ||
| }); | ||
|
|
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| healSchema(schema); | ||
|
|
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| return this.transformer.transformSchema(schema); | ||
| } | ||
|
|
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| public transformRequest(originalRequest: Request): Request { | ||
| return this.transformer.transformRequest(originalRequest); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| import { | ||
| GraphQLFieldConfigMap, | ||
| GraphQLObjectTypeConfig, | ||
| GraphQLObjectType, | ||
| GraphQLFieldConfig, | ||
| } from 'graphql'; | ||
| import { TypeMap } from 'graphql/type/schema'; | ||
|
|
||
| export function appendFields( | ||
| typeMap: TypeMap, | ||
| typeName: string, | ||
| fields: GraphQLFieldConfigMap<any, any>, | ||
| ): void { | ||
| let type = typeMap[typeName]; | ||
| if (type) { | ||
| const typeConfig = type.toConfig() as GraphQLObjectTypeConfig<any, any>; | ||
| const originalFields = typeConfig.fields; | ||
| const newFields = {}; | ||
| Object.keys(originalFields).forEach(fieldName => { | ||
| newFields[fieldName] = originalFields[fieldName]; | ||
| }); | ||
| Object.keys(fields).forEach(fieldName => { | ||
| newFields[fieldName] = fields[fieldName]; | ||
| }); | ||
| type = new GraphQLObjectType({ | ||
| ...typeConfig, | ||
| fields: newFields, | ||
| }); | ||
| } else { | ||
| type = new GraphQLObjectType({ | ||
| name: typeName, | ||
| fields, | ||
| }); | ||
| } | ||
| typeMap[typeName] = type; | ||
| } | ||
|
|
||
| export function removeFields( | ||
| typeMap: TypeMap, | ||
| typeName: string, | ||
| testFn: (fieldName: string, field: GraphQLFieldConfig<any, any>) => boolean, | ||
| ): GraphQLFieldConfigMap<any, any> { | ||
| let type = typeMap[typeName]; | ||
| const typeConfig = type.toConfig() as GraphQLObjectTypeConfig<any, any>; | ||
| const originalFields = typeConfig.fields; | ||
| const newFields = {}; | ||
| const removedFields = {}; | ||
| Object.keys(originalFields).forEach(fieldName => { | ||
| if (testFn(fieldName, originalFields[fieldName])) { | ||
| removedFields[fieldName] = originalFields[fieldName]; | ||
| } else { | ||
| newFields[fieldName] = originalFields[fieldName]; | ||
| } | ||
| }); | ||
| type = new GraphQLObjectType({ | ||
| ...typeConfig, | ||
| fields: newFields, | ||
| }); | ||
| typeMap[typeName] = type; | ||
|
|
||
| return removedFields; | ||
| } |
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