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generate-types.js
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generate-types.js
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'use strict';
var find = require('lodash/collection/find');
var where = require('lodash/collection/where');
var pluck = require('lodash/collection/pluck');
var capitalize = require('lodash/string/capitalize');
var snakeCase = require('lodash/string/snakeCase');
var b = require('ast-types').builders;
var buildVar = require('./ast-builders/variable');
var buildResolver = require('./ast-builders/resolver');
var buildFieldWrapperFunction = require('./ast-builders/field-wrapper-function');
var enumRegex = /^[_a-zA-Z][_a-zA-Z0-9]*$/;
var typeMap = {
id: 'GraphQLID',
string: 'GraphQLString',
integer: 'GraphQLInt',
float: 'GraphQLFloat',
boolean: 'GraphQLBoolean'
};
function exclude(arr, val) {
return arr.filter(function(type) {
return type !== val;
});
}
function generateTypes(data, opts) {
var types = {}, typesUsed;
for (var typeName in data.models) {
typesUsed = [];
types[typeName] = generateType(typeName, data.models[typeName]);
types[typeName].varName = typeName + 'Type';
types[typeName].name = typeName;
types[typeName].imports = exclude(typesUsed, types[typeName].varName);
}
return types;
function addUsedType(type) {
if (typesUsed.indexOf(type) === -1) {
typesUsed.push(type);
}
}
function generateType(name, model) {
var fields = [], refs;
for (var fieldName in model.fields) {
fields.push(generateField(model.fields[fieldName], null, name, model));
refs = where(model.references, { refField: fieldName });
for (var i = 0; i < refs.length; i++) {
fields.push(generateReferenceField(model.fields[fieldName], refs[i]));
}
}
model.listReferences.forEach(function(ref) {
fields.push(generateListReferenceField(ref));
});
var interfaces = opts.relay && b.property(
'init',
b.identifier('interfaces'),
b.arrayExpression([b.identifier('nodeInterface')])
);
var typeDeclaration = b.objectExpression([
b.property('init', b.identifier('name'), b.literal(name)),
generateDescription(model.description),
b.property(
'init',
b.identifier('fields'),
buildFieldWrapperFunction(name, b.objectExpression(fields), opts)
)
].concat(interfaces || []));
return {
ast: buildVar(
name + 'Type',
b.newExpression(
b.identifier('GraphQLObjectType'),
[typeDeclaration]
),
opts.es6
)
};
}
function generateDescription(description) {
return b.property(
'init',
b.identifier('description'),
b.literal(description || opts.defaultDescription)
);
}
function generateField(field, type, parentName, parentModel) {
if (field.isPrimaryKey && opts.relay) {
return b.property('init', b.identifier('id'), b.callExpression(
b.identifier('globalIdField'),
[b.literal(parentName)]
));
}
var props = [
b.property('init', b.identifier('type'), type || getType(field, parentModel)),
generateDescription(field.description)
];
if (field.resolve) {
props.push(b.property('init', b.identifier('resolve'), field.resolve));
}
if (field.args) {
props.push(field.args);
}
return b.property(
'init',
b.identifier(field.name),
b.objectExpression(props)
);
}
function generateReferenceField(refField, refersTo) {
var description = opts.defaultDescription;
if (refersTo.field.indexOf('parent') === 0) {
description += ' (parent ' + refersTo.model.name.toLowerCase() + ')';
} else {
description += ' (reference)';
}
return generateField({
name: refersTo.field,
description: description,
resolve: buildResolver(refersTo.model, refField.originalName)
}, b.callExpression(
b.identifier('getType'),
[b.literal(refersTo.model.name)]
));
}
function generateListReferenceField(reference) {
addUsedType('GraphQLList');
if (opts.relay) {
return generateRelayReferenceField(reference);
}
return generateField({
name: reference.field,
description: reference.description || opts.defaultDescription + ' (reference)',
resolve: buildResolver(reference.model, find(reference.model.fields, { isPrimaryKey: true }).originalName),
args: generateLimitOffsetArgs()
}, b.newExpression(
b.identifier('GraphQLList'),
[b.callExpression(b.identifier('getType'), [b.literal(reference.model.name)])]
));
}
function generateRelayReferenceField(reference) {
return generateField({
name: reference.field,
description: reference.description || opts.defaultDescription + ' (reference)',
resolve: b.callExpression(
b.identifier('getConnectionResolver'),
[b.literal(reference.model.name)]
),
args: b.property('init', b.identifier('args'), b.identifier('connectionArgs'))
}, b.callExpression(
b.identifier('getConnection'),
[b.literal(reference.model.name)]
));
}
function generateLimitOffsetArgs() {
return b.property('init', b.identifier('args'), b.objectExpression([
b.property('init', b.identifier('limit'), b.objectExpression([
b.property('init', b.identifier('name'), b.literal('limit')),
b.property('init', b.identifier('type'), b.identifier('GraphQLInt'))
])),
b.property('init', b.identifier('offset'), b.objectExpression([
b.property('init', b.identifier('name'), b.literal('offset')),
b.property('init', b.identifier('type'), b.identifier('GraphQLInt'))
]))
]));
}
function getType(field, model) {
if (field.type === 'enum') {
addUsedType('GraphQLEnumType');
return getEnum(field, model);
}
var type = typeMap[field.type];
var identifier = b.identifier(type);
addUsedType(type);
if (!field.isNullable) {
addUsedType('GraphQLNonNull');
return b.newExpression(b.identifier('GraphQLNonNull'), [identifier]);
}
return identifier;
}
function getEnum(field, model) {
var values = [], enumKey, enumValue;
var fieldValues = field.values;
var numVals = pluck(fieldValues, 'value').map(Number);
if (numVals.length === 2 && numVals.indexOf(0) > -1 && numVals.indexOf(1) > -1) {
fieldValues = {
TRUE: { value: '1' },
FALSE: { value: '0' }
};
}
for (var name in fieldValues) {
enumValue = fieldValues[name];
enumKey = snakeCase(name).toUpperCase();
if (!enumKey.match(enumRegex)) {
enumKey = 'ENUM_' + enumKey;
}
values.push(b.property(
'init',
b.literal(enumKey),
b.objectExpression([
b.property('init', b.identifier('value'), b.literal(enumValue.value)),
generateDescription(enumValue.description)
])
));
}
var typeDeclaration = b.objectExpression([
b.property('init', b.identifier('name'), b.literal(model.name + capitalize(field.name))),
generateDescription(field.description),
b.property('init', b.identifier('values'), b.objectExpression(values))
]);
return b.newExpression(
b.identifier('GraphQLEnumType'),
[typeDeclaration]
);
}
}
module.exports = generateTypes;