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schema.js
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schema.js
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import { reduce, isArray, isFunction, mapValues } from 'lodash';
import { toCollectionName } from 'mongoose/lib/utils';
import {
GraphQLList,
GraphQLNonNull,
GraphQLID,
GraphQLObjectType,
GraphQLSchema,
GraphQLBoolean,
GraphQLFloat
} from 'graphql';
import {
mutationWithClientMutationId,
connectionArgs,
connectionDefinitions,
globalIdField
} from 'graphql-relay';
import model from './../model';
import type, {
GraphQLViewer,
nodeInterface,
getTypeFields,
getArguments,
setTypeFields
} from './../type';
import query, {
idToCursor,
getIdFetcher,
connectionFromModel
} from './../query';
import { addHooks } from '../utils';
import viewerInstance from '../model/viewer';
import createInputObject from '../type/custom/to-input-object';
const idField = {
name: 'id',
type: new GraphQLNonNull(GraphQLID)
};
function getSingularQueryField(graffitiModel, type, hooks = {}) {
const { name } = type;
const { singular } = hooks;
const singularName = name.toLowerCase();
return {
[singularName]: {
type,
args: {
id: idField
},
resolve: addHooks(query.getOneResolver(graffitiModel), singular)
}
};
}
function getPluralQueryField(graffitiModel, type, hooks = {}) {
const { name } = type;
const { plural } = hooks;
const pluralName = toCollectionName(name);
return {
[pluralName]: {
type: new GraphQLList(type),
args: getArguments(type, {
id: {
type: new GraphQLList(GraphQLID),
description: `The ID of a ${name}`
},
ids: {
type: new GraphQLList(GraphQLID),
description: `The ID of a ${name}`
}
}),
resolve: addHooks(query.getListResolver(graffitiModel), plural)
}
};
}
function getQueryField(graffitiModel, type, hooks) {
return {
...getSingularQueryField(graffitiModel, type, hooks),
...getPluralQueryField(graffitiModel, type, hooks)
};
}
function getConnectionField(graffitiModel, type, hooks = {}) {
const { name } = type;
const { plural } = hooks;
const pluralName = toCollectionName(name.toLowerCase());
const { connectionType } = connectionDefinitions({
name,
nodeType: type,
connectionFields: {
count: {
name: 'count',
type: GraphQLFloat
}
}
});
return {
[pluralName]: {
args: getArguments(type, connectionArgs),
type: connectionType,
resolve: addHooks((rootValue, args, info) => connectionFromModel(graffitiModel, args, info), plural)
}
};
}
function getMutationField(graffitiModel, type, viewer, hooks = {}, allowMongoIDMutation) {
const { name } = type;
const { mutation } = hooks;
const fields = getTypeFields(type);
const inputFields = reduce(fields, (inputFields, field) => {
if (field.type instanceof GraphQLObjectType) {
if (field.type.name.endsWith('Connection')) {
inputFields[field.name] = {
name: field.name,
type: new GraphQLList(GraphQLID)
};
} else if (field.type.mongooseEmbedded) {
inputFields[field.name] = {
name: field.name,
type: createInputObject(field.type)
};
} else {
inputFields[field.name] = {
name: field.name,
type: GraphQLID
};
}
}
if (field.type instanceof GraphQLList && field.type.ofType instanceof GraphQLObjectType) {
inputFields[field.name] = {
name: field.name,
type: new GraphQLList(createInputObject(field.type.ofType))
};
} else if (!(field.type instanceof GraphQLObjectType)
&& field.name !== 'id' && field.name !== '__v'
&& (allowMongoIDMutation || field.name !== '_id')) {
inputFields[field.name] = {
name: field.name,
type: field.type
};
}
return inputFields;
}, {});
const updateInputFields = reduce(fields, (inputFields, field) => {
if (field.type instanceof GraphQLObjectType && field.type.name.endsWith('Connection')) {
inputFields[`${field.name}_add`] = {
name: field.name,
type: new GraphQLList(GraphQLID)
};
}
return inputFields;
}, {});
const changedName = `changed${name}`;
const edgeName = `${changedName}Edge`;
const nodeName = `${changedName}Node`;
const addName = `add${name}`;
const updateName = `update${name}`;
const deleteName = `delete${name}`;
return {
[addName]: mutationWithClientMutationId({
name: addName,
inputFields,
outputFields: {
viewer,
[edgeName]: {
type: connectionDefinitions({
name: changedName,
nodeType: new GraphQLObjectType({
name: nodeName,
fields
})
}).edgeType,
resolve: (node) => ({
node,
cursor: idToCursor(node.id)
})
}
},
mutateAndGetPayload: addHooks(query.getAddOneMutateHandler(graffitiModel), mutation)
}),
[updateName]: mutationWithClientMutationId({
name: updateName,
inputFields: {
...inputFields,
...updateInputFields,
id: idField
},
outputFields: {
[changedName]: {
type,
resolve: (node) => node
}
},
mutateAndGetPayload: addHooks(query.getUpdateOneMutateHandler(graffitiModel), mutation)
}),
[deleteName]: mutationWithClientMutationId({
name: deleteName,
inputFields: {
id: idField
},
outputFields: {
viewer,
ok: {
type: GraphQLBoolean
},
id: idField
},
mutateAndGetPayload: addHooks(query.getDeleteOneMutateHandler(graffitiModel), mutation)
})
};
}
/**
* Returns query and mutation root fields
* @param {Array} graffitiModels
* @param {{Object, Boolean}} {hooks, mutation, allowMongoIDMutation}
* @return {Object}
*/
function getFields(graffitiModels, {
hooks = {}, mutation = true, allowMongoIDMutation = false,
customQueries = {}, customMutations = {}
} = {}) {
const types = type.getTypes(graffitiModels);
const { viewer, singular } = hooks;
const viewerFields = reduce(types, (fields, type, key) => {
type.name = type.name || key;
const graffitiModel = graffitiModels[type.name];
return {
...fields,
...getConnectionField(graffitiModel, type, hooks),
...getSingularQueryField(graffitiModel, type, hooks)
};
}, {
id: globalIdField('Viewer')
});
setTypeFields(GraphQLViewer, viewerFields);
const viewerField = {
name: 'Viewer',
type: GraphQLViewer,
resolve: addHooks(() => viewerInstance, viewer)
};
const { queries, mutations } = reduce(types, ({ queries, mutations }, type, key) => {
type.name = type.name || key;
const graffitiModel = graffitiModels[type.name];
return {
queries: {
...queries,
...getQueryField(graffitiModel, type, hooks)
},
mutations: {
...mutations,
...getMutationField(graffitiModel, type, viewerField, hooks, allowMongoIDMutation)
}
};
}, {
queries: isFunction(customQueries)
? customQueries(mapValues(types, (type) => createInputObject(type)), types)
: customQueries,
mutations: isFunction(customMutations)
? customMutations(mapValues(types, (type) => createInputObject(type)), types)
: customMutations
});
const RootQuery = new GraphQLObjectType({
name: 'RootQuery',
fields: {
...queries,
viewer: viewerField,
node: {
name: 'node',
description: 'Fetches an object given its ID',
type: nodeInterface,
args: {
id: {
type: new GraphQLNonNull(GraphQLID),
description: 'The ID of an object'
}
},
resolve: addHooks(getIdFetcher(graffitiModels), singular)
}
}
});
const RootMutation = new GraphQLObjectType({
name: 'RootMutation',
fields: mutations
});
const fields = {
query: RootQuery
};
if (mutation) {
fields.mutation = RootMutation;
}
return fields;
}
/**
* Returns a GraphQL schema including query and mutation fields
* @param {Array} mongooseModels
* @param {Object} options
* @return {GraphQLSchema}
*/
function getSchema(mongooseModels, options) {
if (!isArray(mongooseModels)) {
mongooseModels = [mongooseModels];
}
const graffitiModels = model.getModels(mongooseModels);
const fields = getFields(graffitiModels, options);
return new GraphQLSchema(fields);
}
export {
getQueryField,
getMutationField,
getFields,
getSchema
};