/
Mutation.ts
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/
Mutation.ts
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import { uniq } from 'lodash';
import { passOrThrow, isArray, isFunction, mapOverProperties } from '../util';
import { Entity } from '../entity/Entity';
export const MUTATION_TYPE_CREATE = 'create';
export const MUTATION_TYPE_UPDATE = 'update';
export const MUTATION_TYPE_DELETE = 'delete';
export const mutationTypes = [
MUTATION_TYPE_CREATE,
MUTATION_TYPE_UPDATE,
MUTATION_TYPE_DELETE,
];
export const defaultEntityMutations = [
{
name: 'create',
type: MUTATION_TYPE_CREATE,
description: (typeName: string) => `Create a new **\`${typeName}\`**`,
hasAttributes: true,
},
{
name: 'update',
type: MUTATION_TYPE_UPDATE,
description: (typeName: string) =>
`Update a single **\`${typeName}\`** using its node ID and a data patch`,
hasAttributes: true,
},
{
name: 'delete',
description: (typeName: string) =>
`Delete a single **\`${typeName}\`** using its node ID`,
type: MUTATION_TYPE_DELETE,
},
];
export type MutationSetup = {
name?: string;
type?: string;
description?: string;
attributes?: string[];
// preProcessor?: Function;
// postProcessor?: Function;
preProcessor?: (
entity?: Entity,
id?: string | number,
source?: any,
input?: any,
typeName?: string,
entityMutation?: Mutation,
context?: any,
info?: any,
) => Promise<any> | any;
postProcessor?: (
error?: any,
result?: any,
entity?: Entity,
id?: string | number,
source?: any,
input?: any,
typeName?: string,
entityMutation?: Mutation,
context?: any,
info?: any,
) => Promise<void> | void;
fromState?: string | string[];
toState?: string | string[];
};
export class Mutation {
name: string;
type: string;
description: string;
attributes: string[];
fromState: string | string[];
toState: string | string[];
preProcessor: Function;
postProcessor: Function;
isTypeCreate?: boolean;
isTypeDelete?: boolean;
needsInstance?: boolean;
ignoreRequired?: boolean;
isTypeUpdate?: boolean;
constructor(setup: MutationSetup = {} as MutationSetup) {
const {
name,
type,
description,
attributes,
preProcessor,
postProcessor,
fromState,
toState,
} = setup;
passOrThrow(name, () => 'Missing mutation name');
passOrThrow(type, () => `Missing type for mutation '${name}'`);
passOrThrow(
mutationTypes.indexOf(type) >= 0,
() =>
`Unknown mutation type '${type}' used, try one of these: '${mutationTypes.join(
', ',
)}'`,
);
passOrThrow(
description,
() => `Missing description for mutation '${name}'`,
);
this.name = name;
this.type = type;
this.description = description;
if (
this.type === MUTATION_TYPE_CREATE ||
this.type === MUTATION_TYPE_UPDATE
) {
this.attributes = attributes;
}
if (this.type === MUTATION_TYPE_CREATE) {
this.isTypeCreate = true;
}
if (this.type === MUTATION_TYPE_UPDATE) {
this.needsInstance = true;
this.ignoreRequired = true;
this.isTypeUpdate = true;
}
if (this.type === MUTATION_TYPE_DELETE) {
this.needsInstance = true;
this.isTypeDelete = true;
}
if (preProcessor) {
passOrThrow(
isFunction(preProcessor),
() => `preProcessor of mutation '${name}' needs to be a valid function`,
);
this.preProcessor = preProcessor;
}
if (postProcessor) {
passOrThrow(
isFunction(postProcessor),
() =>
`postProcessor of mutation '${name}' needs to be a valid function`,
);
this.postProcessor = postProcessor;
}
if (fromState) {
passOrThrow(
this.type !== MUTATION_TYPE_CREATE,
() =>
`Mutation '${this.name}' cannot define fromState as it is a 'create' type mutation`,
);
passOrThrow(
typeof fromState === 'string' || isArray(fromState),
() =>
`fromState in mutation '${name}' needs to be the name of a state or a list of state names as a precondition to the mutation`,
);
if (this.type !== MUTATION_TYPE_DELETE) {
passOrThrow(
toState,
() =>
`Mutation '${this.name}' has a fromState defined but misses a toState definition`,
);
}
this.fromState = fromState;
}
if (toState) {
passOrThrow(
this.type !== MUTATION_TYPE_DELETE,
() =>
`Mutation '${this.name}' cannot define toState as it is a 'delete' type mutation`,
);
passOrThrow(
typeof toState === 'string' || isArray(toState),
() =>
`toState in mutation '${this.name}' needs to be the name of a state or a list of state names the mutation can transition to`,
);
if (this.type !== MUTATION_TYPE_CREATE) {
passOrThrow(
fromState,
() =>
`Mutation '${this.name}' has a toState defined but misses a fromState definition`,
);
}
this.toState = toState;
}
}
toString() {
return this.name;
}
}
export const isMutation = (obj: any) => {
return obj instanceof Mutation;
};
export const processEntityMutations = (
entity: Entity,
mutations: Mutation[],
) => {
passOrThrow(
isArray(mutations),
() =>
`Entity '${entity.name}' mutations definition needs to be an array of mutations`,
);
mutations.map((mutation, idx) => {
passOrThrow(
isMutation(mutation),
() =>
`Invalid mutation definition for entity '${entity.name}' at position '${idx}'`,
);
});
const entityAttributes = entity.getAttributes();
const entityStates = entity.getStates();
const requiredAttributeNames = [];
mapOverProperties(entityAttributes, (attribute, attributeName) => {
if (!attribute.isSystemAttribute) {
if (attribute.required && !attribute.defaultValue) {
requiredAttributeNames.push(attributeName);
}
}
});
const mutationNames = [];
mutations.map(mutation => {
passOrThrow(
!mutationNames.includes(mutation.name),
() =>
`Duplicate mutation name '${mutation.name}' found in '${entity.name}'`,
);
mutationNames.push(mutation.name);
if (mutation.attributes) {
passOrThrow(
(isArray(mutation.attributes, true) &&
mutation.type === MUTATION_TYPE_CREATE) ||
isArray(mutation.attributes, false),
() =>
`Mutation '${entity.name}.${mutation.name}' needs to have a list of attributes`,
);
mutation.attributes.map(attribute => {
passOrThrow(
typeof attribute === 'string',
() =>
`Mutation '${entity.name}.${mutation.name}' needs to have a list of attribute names`,
);
});
passOrThrow(
mutation.attributes.length === uniq(mutation.attributes).length,
() =>
`Mutation '${entity.name}.${mutation.name}' needs to have a list of unique attribute names`,
);
mutation.attributes.map(attributeName => {
passOrThrow(
entityAttributes[attributeName],
() =>
`Cannot use attribute '${entity.name}.${attributeName}' in mutation '${entity.name}.${mutation.name}' as it does not exist`,
);
});
if (mutation.type === MUTATION_TYPE_CREATE) {
const missingAttributeNames = requiredAttributeNames.filter(
requiredAttributeName => {
return !mutation.attributes.includes(requiredAttributeName);
},
);
passOrThrow(
missingAttributeNames.length === 0,
() =>
`Missing required attributes in mutation '${entity.name}.${
mutation.name
}' need to have a defaultValue() function: [ ${missingAttributeNames.join(
', ',
)} ]`,
);
}
} else if (
mutation.type === MUTATION_TYPE_CREATE ||
mutation.type === MUTATION_TYPE_UPDATE
) {
const nonSystemAttributeNames = [];
mapOverProperties(entityAttributes, (attribute, attributeName) => {
if (!attribute.isSystemAttribute) {
nonSystemAttributeNames.push(attributeName);
}
});
mutation.attributes = nonSystemAttributeNames;
}
const checkMutationStates = stateStringOrArray => {
const stateNames = isArray(stateStringOrArray)
? stateStringOrArray
: [stateStringOrArray];
stateNames.map(stateName => {
passOrThrow(
entityStates[stateName],
() =>
`Unknown state '${stateName}' used in mutation '${entity.name}.${mutation.name}'`,
);
});
};
if (mutation.fromState) {
passOrThrow(
entity.hasStates(),
() =>
`Mutation '${entity.name}.${mutation.name}' cannot define fromState as the entity is stateless`,
);
checkMutationStates(mutation.fromState);
}
if (mutation.toState) {
passOrThrow(
entity.hasStates(),
() =>
`Mutation '${entity.name}.${mutation.name}' cannot define toState as the entity is stateless`,
);
checkMutationStates(mutation.toState);
}
});
return mutations;
};