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postgraphile-table-extension-plugin

v1.0.0

Published

PostGraphile plugin that exten a table's fields with another relation (table/view)

Downloads

51

Readme

postgraphile-table-extension-plugin

Maintainability Test Coverage CircleCI

Motivation

Sometimes we create want to add some table/view's (call table A) to another table (table B), so that when we query for table B, we could also get the fields in table A without go into the association

Example

type User {
  id
  portfolioByPortfolioId {
    id
    name
  }
}

With this extension, it is possible to do the following

query {
  allUsers{
    id
    name
  }
}

instead of

query{
  allUsers{
    id
    portfolioByPortfolioId {
      id
      name
    }
  } 
}

Description

Currently, to extend a table A to B (adding fields from A to B), it must satisfy the following

  1. table A and table B must be associated with a foreign key. a. if A has a foreign key like b_id. Then this would be a forwardExtension. b. if B has a foregin key like a_id. then adding fields from A to B would be a backwardExtension.
  2. the foreignKey between A and B should be an unique foreign key.
  3. The fields that gets copied cannot overlap.

How to Use

npm install postgraphile-table-extension-plugin

Then add it to postgraphile

import {tableExtensionPlugin} from 'postgraphile-table-extension-plugin';

createPostGraphileSchema(client, ['p'], {
appendPlugins:[tableExtensionPlugin]
});

Then use @smartComment on the foreignKey to indication extension For example, if you want to add table A's fields to table B, then

comment on table_a.b_id is E'@forwardExtension';

or if the foreign key is on table B, then

comment on table_b.a_id is E'@backwardExtension';