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<div class="content" data-ice="content"><h1 data-ice="title">src/schema/enhanceSchemaWithQueryArguments.js</h1>
<pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">// @flow
import cloneDeep from 'lodash.clonedeep';
import {
getBaseType,
buildTypeDefinition,
buildField,
buildValue,
buildArgument,
isScalarField
} from '../util/graphql';
import {
DOCUMENT,
OBJECT_TYPE_DEFINITION,
INPUT_OBJECT_TYPE_DEFINITION,
ENUM_TYPE_DEFINITION,
TYPE_EXTENSION_DEFINITION,
LIST_TYPE,
FIELD_DEFINITION,
NAME
} from 'graphql/language/kinds';
import {
INT,
FLOAT,
STRING,
ENUM,
BOOLEAN,
BSON_TYPE,
REGEX,
QUERY
} from '../constants';
import { lcFirst } from '../util/capitalization';
/**
* prepares the schema for the additional query arguments types
* @public
* @param {object} inputSchema - the input's schema with all fields
* @return {object} enhancedSchema - the enhanced output Schema
*/
export function enhanceSchemaWithQueryArguments(inputSchema: any): any {
const enhancedSchema = cloneDeep(inputSchema);
const queryArguments = {};
if (enhancedSchema.kind === DOCUMENT) {
enhancedSchema.definitions
.filter(def => def.kind === OBJECT_TYPE_DEFINITION)
.forEach(({ fields, name }) => {
const TypeName = name.value;
// get all field definition types
const fieldTypes = getFieldTypes(fields);
// prepare "filter" query argument fields for scalar types
const filterInputFields = getFilterInputFields(fieldTypes, TypeName);
// prepare an enum to contain all sortable fields for the orderBy
const sortEnumValues = getEnumValues(fieldTypes);
// prepare "orderBy" query argument fields
const orderByInputFields = getOrderByInputFields(TypeName);
if (filterInputFields.length > 0) {
const queryFieldName = `${lcFirst(TypeName)}s`;
const FilterInputTypeName = `${TypeName}Filter`;
const SortEnumTypeName = `${TypeName}Sort`;
const OrderByInputTypeName = `${TypeName}OrderBy`;
addFilterInputType(
FilterInputTypeName,
filterInputFields,
enhancedSchema
);
addSortEnumType(SortEnumTypeName, sortEnumValues, enhancedSchema);
addOrderByInputType(
OrderByInputTypeName,
orderByInputFields,
enhancedSchema
);
queryArguments[queryFieldName] = {
filterName: FilterInputTypeName,
orderByName: `[${OrderByInputTypeName}!]`
};
}
});
// add the newly created types to the Query itself,
// to make them accessable by users
addQueryArguments(enhancedSchema, queryArguments);
// add query arguments to other paginated fields
addPaginatedFieldsArguments(enhancedSchema);
}
return enhancedSchema;
}
/**
* prepares the orderBy input type
* @private
* @param {string} TypeName - the name of the type
* @return {object} fieldAST - the AST of an input type field
*/
function getOrderByInputFields(TypeName) {
// prepare "orderBy" query argument fields
return [
buildField('sort', [], `${TypeName}Sort!`),
buildField('direction', [], 'Direction = ASC')
];
}
/**
* prepare enum values out of field types
* @private
* @param {array} fieldTypes - AST array of field definitions
* @return {object} fieldAST - the AST of enum values
*/
function getEnumValues(fieldTypes) {
// prepare an enum to contain all sortable fields for the orderBy
return fieldTypes
.filter(field => field.scalar)
.map(field => buildValue(field.name, [], STRING));
}
/**
* prepare enum values out of field types
* @private
* @param {array} fieldTypes - AST array of field definitions
* @param {string} TypeName - the name of the type
* @return {object} fieldAST - the AST of enum values
*/
function getFilterInputFields(fieldTypes, TypeName) {
// prepare "filter" query argument fields for scalar types
return fieldTypes
.filter(field => field.scalar)
.map(field => prepareArgument(field, TypeName))
.reduce((array, field) => array.concat(field), [
{ [`AND`]: `[${TypeName}Filter!]` },
{ [`NOR`]: `[${TypeName}Filter!]` },
{ [`OR`]: `[${TypeName}Filter!]` }
])
.map(field => {
const name = Object.keys(field)[0];
const type = field[name];
return buildField(name, [], type);
});
}
/**
* analyse and identify field information for further processing
* @private
* @param {array} fields - AST array of field definitions
* @return {array} fieldAST - list of field descriptions
*/
function getFieldTypes(fields) {
return fields.map(field => ({
name: field.name.value,
type: getBaseType(field.type).name.value,
scalar: isScalarField(field)
}));
}
/**
* registers the "filter" input type into the AST
* @private
* @param {string} FilterInputTypeName - name of the input field
* @param {array} filterInputFields - AST array of field definitions
* @param {object} enhancedSchema - AST of the document
*/
function addFilterInputType(
FilterInputTypeName,
filterInputFields,
enhancedSchema
) {
// add "input <TypeName>Filter" type to the schema
enhancedSchema.definitions.push(
buildTypeDefinition(
FilterInputTypeName,
filterInputFields,
INPUT_OBJECT_TYPE_DEFINITION
)
);
}
/**
* registers the "enum <Type>Sort" enum type into the AST
* @private
* @param {string} SortEnumTypeName - name of the enum field
* @param {array} sortEnumValues - AST array of field definitions
* @param {object} enhancedSchema - AST of the document
*/
function addSortEnumType(SortEnumTypeName, sortEnumValues, enhancedSchema) {
// add "enum <TypeName>Sort" type
enhancedSchema.definitions.push(
buildTypeDefinition(
SortEnumTypeName,
[],
ENUM_TYPE_DEFINITION,
sortEnumValues
)
);
}
/**
* registers the "input <Type>OrderBy" input type into the AST
* @private
* @param {string} OrderByInputTypeName - name of the input field
* @param {array} orderByInputFields - AST array of field definitions
* @param {object} enhancedSchema - AST of the document
*/
function addOrderByInputType(
OrderByInputTypeName,
orderByInputFields,
enhancedSchema
) {
// add "input <TypeName>OrderBy" type
enhancedSchema.definitions.push(
buildTypeDefinition(
OrderByInputTypeName,
orderByInputFields,
INPUT_OBJECT_TYPE_DEFINITION
)
);
}
/**
* adds the query arguments "filter" and "orderBy" to the "extend Query" type
* @private
* @param {object} enhancedSchema - AST document definition, to be enhanced
* @param {array} queryArguments - dictionary of queryArguments to be added
*/
function addQueryArguments(enhancedSchema, queryArguments) {
// add the arguments to the Query:
// e.g.: tweets(filter: TweetFilter, orderBy: [TweetOrderBy!])
enhancedSchema.definitions
.filter(
def =>
def.kind === TYPE_EXTENSION_DEFINITION &&
def.definition.kind === OBJECT_TYPE_DEFINITION &&
def.definition.name.value === QUERY
)
.forEach(({ definition }) => {
const { fields, name } = definition;
if (fields && name) {
// find the right fields
fields
// only in field definition, which are a list, such as 'users'
.filter(
field =>
field.type.kind === LIST_TYPE && field.kind === FIELD_DEFINITION
)
.forEach(field => {
// as arguments is a reserved field, we need to rename to args
const args = field.arguments;
const queryArgument = queryArguments[field.name.value];
// if we have arguments to add for this type e.g. 'users'
if (queryArgument && field.name.kind === NAME && args) {
// add "skip" query argument
args.push(buildArgument('skip', 'Int'));
// add "filter" query argument
args.push(buildArgument('filter', queryArgument.filterName));
// add "orderBy" query argument
args.push(buildArgument('orderBy', queryArgument.orderByName));
}
});
}
});
}
/**
* adds the query arguments "filter" and "orderBy" to the type paginated fields
* @private
* @param {object} enhancedSchema - AST document definition, to be enhanced
* @param {array} queryArguments - dictionary of queryArguments to be added
*/
function addPaginatedFieldsArguments(enhancedSchema) {
// add the arguments to other paginated fields
// e.g.: tweets(filter: TweetFilter, orderBy: [TweetOrderBy!])
enhancedSchema.definitions
.filter(def => def.kind === OBJECT_TYPE_DEFINITION)
.forEach(definition => {
const { fields, name } = definition;
if (fields && name) {
// find the right fields
fields
// only in field definition, which are a list, such as 'users'
.filter(
field =>
field.type.kind === LIST_TYPE && field.kind === FIELD_DEFINITION
)
.forEach(field => {
// get its target type
const targetType = field.type.type.name.value;
const filterName = `${targetType}Filter`;
const orderByName = `[${targetType}OrderBy!]`;
// as arguments is a reserved field, we need to rename to args
const args = field.arguments;
// add "skip" query argument
args.push(buildArgument('skip', 'Int'));
// add "filter" query argument
args.push(buildArgument('filter', filterName));
// add "orderBy" query argument
args.push(buildArgument('orderBy', orderByName));
});
}
});
}
/**
* define the combinations of input and output types
* depending on the later expected values for the functions
* @private
* @param {object} field - field of the type
* @property {string} name - name of the field
* @property {string} type - type of the field
* @param {string} TypeName - name of the type
* @return {array} argumentFields - map of arguments and their types
*/
function prepareArgument({ name, type }, TypeName) {
switch (type) {
case STRING:
case ENUM:
return [
{ [`${name}`]: type },
{ [`${name}_lt`]: type },
{ [`${name}_lte`]: type },
{ [`${name}_gt`]: type },
{ [`${name}_gte`]: type },
{ [`${name}_eq`]: type },
{ [`${name}_ne`]: type },
{ [`${name}_not`]: `${TypeName}Filter` },
{ [`${name}_all`]: `[${type}!]` },
{ [`${name}_in`]: `[${type}!]` },
{ [`${name}_nin`]: `[${type}!]` },
{ [`${name}_not_in`]: `[${type}!]` },
{ [`${name}_exists`]: BOOLEAN },
{ [`${name}_type`]: BSON_TYPE },
{ [`${name}_regex`]: REGEX },
{ [`${name}_contains`]: STRING },
{ [`${name}_starts_with`]: STRING },
{ [`${name}_ends_with`]: STRING },
{ [`${name}_not_contains`]: STRING },
{ [`${name}_not_starts_with`]: STRING },
{ [`${name}_not_ends_with`]: STRING },
{ [`${name}_contains_ci`]: STRING },
{ [`${name}_starts_with_ci`]: STRING },
{ [`${name}_ends_with_ci`]: STRING },
{ [`${name}_not_contains_ci`]: STRING },
{ [`${name}_not_starts_with_ci`]: STRING },
{ [`${name}_not_ends_with_ci`]: STRING }
];
case INT:
case FLOAT:
return [
{ [`${name}`]: type },
{ [`${name}_lt`]: type },
{ [`${name}_lte`]: type },
{ [`${name}_gt`]: type },
{ [`${name}_gte`]: type },
{ [`${name}_eq`]: type },
{ [`${name}_ne`]: type },
{ [`${name}_all`]: `[${type}!]` },
{ [`${name}_in`]: `[${type}!]` },
{ [`${name}_nin`]: `[${type}!]` },
{ [`${name}_not_in`]: `[${type}!]` },
{ [`${name}_exists`]: BOOLEAN },
{ [`${name}_type`]: BSON_TYPE }
];
case BOOLEAN:
default:
return [
{ [`${name}`]: type },
{ [`${name}_eq`]: type },
{ [`${name}_ne`]: type },
{ [`${name}_all`]: `[${type}!]` },
{ [`${name}_in`]: `[${type}!]` },
{ [`${name}_nin`]: `[${type}!]` },
{ [`${name}_not_in`]: `[${type}!]` },
{ [`${name}_exists`]: BOOLEAN },
{ [`${name}_type`]: BSON_TYPE }
];
}
}
</code></pre>
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