This plugin implements nested mutations based on both forward and reverse foreign key relationships in PostGraphile v4. Nested mutations can be of infinite depth.

postgraphile --append-plugins postgraphile-plugin-nested-mutations

See here for more information about loading plugins with PostGraphile.

const express = require('express'); const { postgraphile } = require('postgraphile'); const PostGraphileNestedMutations = require('postgraphile-plugin-nested-mutations'); const app = express(); app.use( postgraphile(pgConfig, schema, { appendPlugins: [ PostGraphileNestedMutations, ], }) ); app.listen(5000);

When using PostGraphile as a library, the following plugin options can be passed via graphileBuildOptions:

postgraphile(pgConfig, schema, { graphileBuildOptions: { nestedMutationsSimpleFieldNames: true, } });

postgraphile(pgConfig, schema, { graphileBuildOptions: { nestedMutationsDeleteOthers: false, } });

postgraphile(pgConfig, schema, { graphileBuildOptions: { nestedMutationsOldUniqueFields: false, } });

This plugin creates an additional field on each GraphQL Input type for every forward and reverse foreign key relationship on a table, with the same name as the foreign table.

Each nested mutation field will have the following fields. They will accept an array if the relationship is a one-to-many relationship, or a single input if they are one-to-one.

Connect using a nodeId from the nested table.

Connect using any readable primary key or unique constraint on the nested table.

Create a new record in the nested table.

Delete using a nodeId from the nested table.

Delete using any readable primary key or unique constraint on the nested table.

Update a record using a nodeId from the nested table.

Update a record using any readable primary key or unique constraint on the nested table.

create table parent ( id serial primary key, name text not null ); create table child ( id serial primary key, parent_id integer, name text not null, constraint child_parent_fkey foreign key (parent_id) references p.parent (id) );

A nested mutation against this schema, using Parent as the base mutation would look like this:

mutation { createParent(input: { parent: { name: "Parent 1" childrenUsingId: { connectById: [{ id: 1 }] create: [{ name: "Child 1" }, { name: "Child 2" }] } } }) { parent { id name childrenByParentId { nodes { id name } } } } }

Or using Child as the base mutation:

mutation { createChild(input: { child: { name: "Child 1" parentToParentId: { create: { name: "Parent of Child 1" } } }, }) { child { id name parentByParentId { id name } } } }

Smart comments are supported for renaming the nested mutation fields.

comment on constraint child_parent_fkey on child is E'@fieldName parent\n@foreignFieldName children';