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type-function">F</span><span class="nav-item-name"><a href="ModuleParser.html#%25E2%258C%25BE%25E2%25A0%2580parseSync">⌾⠀parseSync</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="ModuleParser.html#~%25E2%258C%25BE%25E2%25A0%2580walk">⌾⠀walk</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="ModuleParser.html#~%25E2%258C%25BE%25E2%25A0%2580walkSync">⌾⠀walkSync</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="ModuleParser.html#~%25E2%258E%2586%25E2%25A0%2580constructor">⎆⠀constructor</a></span></li><li class="nav-heading"><span class="nav-item-type type-class">C</span><span class="nav-item-name"><a href="ModuleParser.exports.ModuleParser.html">exports.ModuleParser</a></span></li><li class="nav-heading"><span class="nav-item-type type-class">C</span><span class="nav-item-name"><a href="SchemaUtils.html">SchemaUtils</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SchemaUtils.html#.%25E2%258C%25BE%25E2%25A0%2580createMergedRoot">⌾⠀createMergedRoot</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SchemaUtils.html#.%25E2%258C%25BE%25E2%25A0%2580injectComments">⌾⠀injectComments</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SchemaUtils.html#.%25E2%258C%25BE%25E2%25A0%2580injectEnums">⌾⠀injectEnums</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SchemaUtils.html#.%25E2%258C%25BE%25E2%25A0%2580injectInterfaceResolvers">⌾⠀injectInterfaceResolvers</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SchemaUtils.html#.%25E2%258C%25BE%25E2%25A0%2580injectScalars">⌾⠀injectScalars</a></span></li><li class="nav-heading"><span class="nav-item-type type-class">C</span><span class="nav-item-name"><a href="SyntaxTree.html">SyntaxTree</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580EmptyDocument">⌾⠀EmptyDocument</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580EmptyMutation">⌾⠀EmptyMutation</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580EmptyQuery">⌾⠀EmptyQuery</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580findDefinition">⌾⠀findDefinition</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580findField">⌾⠀findField</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580findInASTArrayByNameValue">⌾⠀findInASTArrayByNameValue</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580from">⌾⠀from</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580fromAST">⌾⠀fromAST</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580fromSchema">⌾⠀fromSchema</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258E%2586%25E2%25A0%2580constructor">⎆⠀constructor</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#%25E2%258C%25BE%25E2%25A0%2580appendDefinitions">⌾⠀appendDefinitions</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#%25E2%258C%25BE%25E2%25A0%2580consumeDefinition">⌾⠀consumeDefinition</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#%25E2%258C%25BE%25E2%25A0%2580find">⌾⠀find</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a 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  <h1 class="page-title">SchemaUtils.js</h1>
  
34
  
36
37
38
  
  <section>
      <article>
          <pre class="prettyprint source linenums"><code>// @flow
43
44import path from 'path'
45import { SyntaxTree } from './SyntaxTree'
46import { GQLBase, META_KEY } from './GQLBase'
47import { GQLEnum } from './GQLEnum'
48import { GQLInterface } from './GQLInterface'
49import { GQLScalar } from './GQLScalar'
50import { typeOf } from 'ne-types'
51import { LatticeLogs as ll } from './utils'
52import { merge } from 'lodash'
53import EventEmitter from 'events'
54import {
parse,
print,
buildSchema,
GraphQLInterfaceType,
GraphQLEnumType,
GraphQLScalarType,
GraphQLSchema
62} from 'graphql'
63
64/**
* The SchemaUtils is used by tools such as GQLExpressMiddleware in order to
* apply GraphQL Lattice specifics to the build schema.
*
* @class SchemaUtils
*/
70export class SchemaUtils extends EventEmitter {
/**
 * Calls all the Lattice post-schema creation routines on a given Schema
 * using data from a supplied array of classes.
 *
 * @param {GraphQLSchema} schema the schema to post-process
 * @param {Array&lt;GQLBase>} Classes the Classes from which to drive post
 * processing data from
 */
static injectAll(schema: GraphQLSchema, Classes: Array&lt;GQLBase>) {
  SchemaUtils.injectInterfaceResolvers(schema, Classes);
  SchemaUtils.injectEnums(schema, Classes);
  SchemaUtils.injectScalars(schema, Classes);
  SchemaUtils.injectComments(schema, Classes);
}
85
/**
 * Until such time as I can get the reference Facebook GraphQL AST parser to
 * read and apply descriptions or until such time as I employ the Apollo
 * AST parser, providing a `static get apiDocs()` getter is the way to get
 * your descriptions into the proper fields, post schema creation.
 *
 * This method walks the types in the registered classes and the supplied
 * schema type. It then injects the written comments such that they can
 * be exposed in graphiql and to applications or code that read the meta
 * fields of a built schema
 *
 * @memberof SchemaUtils
 * @method ⌾⠀injectComments
 * @static
 * @since 2.7.0
 *
 * @param {Object} schema a built GraphQLSchema object created via buildSchema
 * or some other alternative but compatible manner
 * @param {Function[]} Classes these are GQLBase extended classes used to
 * manipulate the schema with.
 */
static injectComments(schema: Object, Classes: Array&lt;GQLBase>) {
  const {
    DOC_CLASS, DOC_FIELDS, DOC_QUERIES, DOC_MUTATORS, DOC_SUBSCRIPTIONS,
    DOC_QUERY, DOC_MUTATION, DOC_SUBSCRIPTION
  } = GQLBase;
112
  for (let Class of Classes) {
    const docs = Class.apiDocs();
    const query = schema._typeMap.Query;
    const mutation = schema._typeMap.Mutation;
    const subscription = schema._typeMap.Subscription;
    let type;
119
    if ((type = schema._typeMap[Class.name])) {
      let fields = type._fields;
      let values = type._values;
123
      if (docs[DOC_CLASS]) { type.description = docs[DOC_CLASS] }
125
      for (let field of Object.keys(docs[DOC_FIELDS] || {})) {
        if (fields &amp;&amp; field in fields) {
          fields[field].description = docs[DOC_FIELDS][field];
        }
        if (values) {
          for (let value of values) {
            if (value.name === field) {
              value.description = docs[DOC_FIELDS][field]
            }
          }
        }
      }
    }
139
    for (let [_type, _CONST, _topCONST] of [
      [query, DOC_QUERIES, DOC_QUERY],
      [mutation, DOC_MUTATORS, DOC_MUTATION],
      [subscription, DOC_SUBSCRIPTIONS, DOC_SUBSCRIPTION]
    ]) {
      if (
        _type
        &amp;&amp; (
          (Object.keys(docs[_CONST] || {}).length)
          || (docs[_topCONST] &amp;&amp; docs[_topCONST].length)
        )
      ) {
        let fields = _type._fields;
153
        if (docs[_topCONST]) {
          _type.description = docs[_topCONST]
        }
157
        for (let field of Object.keys(docs[_CONST])) {
          if (field in fields) {
            fields[field].description = docs[_CONST][field];
          }
        }
      }
    }
  }
}
167
/**
 * Somewhat like `injectComments` and other similar methods, the
 * `injectInterfaceResolvers` method walks the registered classes and
 * finds `GQLInterface` types and applies their `resolveType()`
 * implementations.
 *
 * @memberof SchemaUtils
 * @method ⌾⠀injectInterfaceResolvers
 * @static
 *
 * @param {Object} schema a built GraphQLSchema object created via buildSchema
 * or some other alternative but compatible manner
 * @param {Function[]} Classes these are GQLBase extended classes used to
 * manipulate the schema with.
 */
static injectInterfaceResolvers(schema: Object, Classes: Array&lt;GQLBase>) {
  for (let Class of Classes) {
    if (Class.GQL_TYPE === GraphQLInterfaceType) {
      schema._typeMap[Class.name].resolveType =
      schema._typeMap[Class.name]._typeConfig.resolveType =
        Class.resolveType;
    }
  }
}
192
/**
 * Somewhat like `injectComments` and other similar methods, the
 * `injectInterfaceResolvers` method walks the registered classes and
 * finds `GQLInterface` types and applies their `resolveType()`
 * implementations.
 *
 * @memberof SchemaUtils
 * @method ⌾⠀injectEnums
 * @static
 *
 * @param {Object} schema a built GraphQLSchema object created via buildSchema
 * or some other alternative but compatible manner
 * @param {Function[]} Classes these are GQLBase extended classes used to
 * manipulate the schema with.
 */
static injectEnums(schema: Object, Classes: Array&lt;GQLBase>) {
  for (let Class of Classes) {
    if (Class.GQL_TYPE === GraphQLEnumType) {
      const __enum = schema._typeMap[Class.name];
      const values = Class.values;
213
      for (let value of __enum._values) {
        if (value.name in values) {
          merge(value, values[value.name])
        }
      }
    }
  }
}
222
/**
 * GQLScalar types must define three methods to have a valid implementation.
 * They are serialize, parseValue and parseLiteral. See their docs for more
 * info on how to do so.
 *
 * This code finds each scalar and adds their implementation details to the
 * generated schema type config.
 *
 * @memberof SchemaUtils
 * @method ⌾⠀injectScalars
 * @static
 *
 * @param {Object} schema a built GraphQLSchema object created via buildSchema
 * or some other alternative but compatible manner
 * @param {Function[]} Classes these are GQLBase extended classes used to
 * manipulate the schema with.
 */
static injectScalars(schema: Object, Classes: Array&lt;GQLBase>) {
  for (let Class of Classes) {
    if (Class.GQL_TYPE === GraphQLScalarType) {
      // @ComputedType
      const type = schema._typeMap[Class.name];
245
      // @ComputedType
      const { serialize, parseValue, parseLiteral } = Class;
248
      if (!serialize || !parseValue || !parseLiteral) {
        // @ComputedType
        ll.error(`Scalar type ${Class.name} has invaild impl.`);
        continue;
      }
254
      merge(type._scalarConfig, {
        serialize,
        parseValue,
        parseLiteral
      });
    }
  }
}
263
/**
 * A function that combines the IDL schemas of all the supplied classes and
 * returns that value to the middleware getter.
 *
 * @static
 * @memberof GQLExpressMiddleware
 * @method ⌾⠀generateSchemaSDL
 *
 * @return {string} a dynamically generated GraphQL IDL schema string
 */
static generateSchemaSDL(
  Classes: Array&lt;GQLBase>,
  logOutput: boolean = true
): string {
  let schema = SyntaxTree.EmptyDocument();
  let log = (...args) => {
    if (logOutput) {
      console.log(...args);
    }
  }
284
  for (let Class of Classes) {
    let classSchema = Class.SCHEMA;
287
    if (typeOf(classSchema) === 'Symbol') {
      let handler = Class.handler;
      let filename = path.basename(Class.handler.path)
291
      classSchema = handler.getSchema();
      log(
        `\nRead schema (%s)\n%s\n%s\n`,
        filename,
        '-'.repeat(14 + filename.length),
        classSchema.replace(/^/gm, '  ')
      )
    }
300
    schema.appendDefinitions(classSchema);
  }
303
  log('\nGenerated GraphQL Schema\n----------------\n%s', schema);
305
  return schema.toString();
}
308
/**
 * An asynchronous function used to parse the supplied classes for each
 * ones resolvers and mutators. These are all combined into a single root
 * object passed to express-graphql.
 *
 * @static
 * @memberof SchemaUtils
 * @method ⌾⠀createMergedRoot
 *
 * @param {Array&lt;GQLBase>} Classes the GQLBase extended class objects or
 * functions from which to merge the RESOLVERS and MUTATORS functions.
 * @param {Object} requestData for Express apss, this will be an object
 * containing { req, res, gql } where those are the Express request and
 * response object as well as the GraphQL parameters for the request.
 * @return {Promise&lt;Object>} a Promise resolving to an Object containing all
 * the functions described in both Query and Mutation types.
 */
static async createMergedRoot(
  Classes: Array&lt;GQLBase>,
  requestData: Object,
  separateByType: boolean = false
): Promise&lt;Object> {
  const root = {};
332
  for (let Class of Classes) {
    merge(
      root,
      // $FlowFixMe
      await Class.getMergedRoot(requestData, separateByType)
    );
  }
340
  return root;
}
343}
344
345export default SchemaUtils
346</code></pre>
      </article>
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