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https://github.com/owen2345/graphql_preload_queries
This gem permits your graphql application to define association preloads to improve app performance by removing N+1 query issues.
https://github.com/owen2345/graphql_preload_queries
graphql rails
Last synced: about 2 months ago
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This gem permits your graphql application to define association preloads to improve app performance by removing N+1 query issues.
- Host: GitHub
- URL: https://github.com/owen2345/graphql_preload_queries
- Owner: owen2345
- License: mit
- Created: 2020-11-23T14:00:19.000Z (almost 4 years ago)
- Default Branch: master
- Last Pushed: 2021-05-31T08:44:28.000Z (over 3 years ago)
- Last Synced: 2024-07-14T15:06:01.938Z (2 months ago)
- Topics: graphql, rails
- Language: Ruby
- Homepage:
- Size: 97.7 KB
- Stars: 3
- Watchers: 4
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: MIT-LICENSE
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README
# GraphqlPreloadQueries
This gem permits your graphql application to define association preloads to improve app performance by removing N+1 query issues.
## Usage
* Object Type
```ruby
class UserType < Types::BaseObject
field :id, Int, null: true
field :name, String, null: true
field :parents, [Types::UserType], null: false, preload: true
field :friends, [Types::UserType], null: false, preload: :user_friends
end
```
`preload:` accepts:
- `true`: Will use field key as the association name
`field :parents, ..., preload: true` will preload `parents` association
- `Symbol`: Custom association name
`field :friends, ..., preload: :user_friends` will preload `user_friends` association
- `String`: Tied associations
`field :excluded_friends, ..., preload: 'excluded_friends.user'` will preload `excluded_friends -> user` association
- `Hash`: Deep preload definitions
`field :best_friends, ..., preload: { preload: :user_friends, parents: :parents }'`
* Will preload `user_friends` and `user_friends.parents` only if query includes inner definition, like `user(id: 10) { bestFriends { id parents { ... } } }`
* Will not preload `user_friends.parents` if query does not include inner definition, like `user(id: 10) { bestFriends { id } }`
* Preloads in query results
- BEFORE
```ruby
# queries/users.rb
def users(ids:)
users = User.where(id: ids)
end
```
Does not apply preloads to the root query.
- AFTER
```ruby
def users(ids:)
users = User.where(id: ids)
users = include_gql_preloads(users)
end
```
Root query applies all defined preloads
- `include_gql_preloads(collection, query_key: nil, type_klass: nil)`: Will include all preloads configured in `type_klass` (UserType) based on the gql query.
- `collection` (ActiveRecordCollection) Query results
- `query_key` (String | Sym, default: method name) Field result key
- `type_klass:` (GQL TypeClass, default: calculates using query_key)
* Preloads in mutation results
```ruby
# mutations/users/disable.rb
#...
field :users, [Types::UserType], null: true
def resolve(ids:)
affected_users = User.where(id: ids)
affected_users = include_gql_preloads(affected_users, query_key: :users)
{ users: affected_users }
end
```
- `include_gql_preloads(collection, query_key: , type_klass: nil)`: Will include all preloads configured in `type_klass` (UserType) based on the gql query.
- `collection` (ActiveRecordCollection) Query results
- `query_key` (String | Sym) Field result key
- `type_klass:` (GQL TypeClass, default: calculates using query_key)
## Installation
Add this line to your application's Gemfile:
```ruby
gem 'graphql_preload_queries'
```
And then execute:
```bash
$ bundle install
```
Or install it yourself as:
```bash
$ gem install graphql_preload_queries
```
For debugging mode:
```
# config/initializers/gql_preload.rb
GraphqlPreloadQueries::DEBUG = true
```
## Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/owen2345/graphql_preload_queries. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.
## License
The gem is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT).