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https://github.com/xuorig/graphql-schema_comparator
Get changes between two GraphQL schemas 🤖
https://github.com/xuorig/graphql-schema_comparator
cli graphql graphql-ruby schema-idl
Last synced: 3 days ago
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Get changes between two GraphQL schemas 🤖
- Host: GitHub
- URL: https://github.com/xuorig/graphql-schema_comparator
- Owner: xuorig
- License: mit
- Created: 2017-07-22T21:22:42.000Z (over 7 years ago)
- Default Branch: master
- Last Pushed: 2023-10-27T15:54:29.000Z (about 1 year ago)
- Last Synced: 2024-12-08T03:06:21.870Z (17 days ago)
- Topics: cli, graphql, graphql-ruby, schema-idl
- Language: Ruby
- Homepage:
- Size: 185 KB
- Stars: 266
- Watchers: 7
- Forks: 28
- Open Issues: 9
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE.txt
- Code of conduct: CODE_OF_CONDUCT.md
Awesome Lists containing this project
- awesome-list - graphql-schema_comparator
README
# GraphQL::SchemaComparator
`GraphQL::SchemaComparator` is a GraphQL Schema comparator. What does that mean? `GraphQL::SchemaComparator` takes
two GraphQL schemas and outputs a list of changes between versions. This is useful for many things:
- Breaking Change detection
- Applying custom rules to schema changes
- Building automated tools like linters
## Installation
Add this line to your application's Gemfile:
```ruby
gem 'graphql-schema_comparator'
```
And then execute:
$ bundle
Or install it yourself as:
$ gem install graphql-schema_comparator
## CLI
`GraphQL::SchemaComparator` comes with a handy CLI to help compare two schemas using
the command line.
After a `gem install graphql-schema_comparator`, use the CLI this way:
```
Commands:
schema_comparator compare OLD_SCHEMA NEW_SCHEMA # Compares OLD_SCHEMA with NEW_SCHEMA and returns a list of changes
schema_comparator help [COMMAND] # Describe available commands or one specific command
```
Where OLD_SCHEMA and NEW_SCHEMA can be a string containing a schema IDL or a filename where that IDL is located.
### Example
```
$ ./bin/schema_comparator compare "type Query { a: A } type A { a: String } enum B { A_VALUE }" "type Query { a: A } type A { b: String } enum B { A_VALUE ANOTHER_VALUE }"
⏳ Checking for changes...
🎉 Done! Result:
Detected the following changes between schemas:
🛑 Field `a` was removed from object type `A`
⚠️ Enum value `ANOTHER_VALUE` was added to enum `B`
✅ Field `b` was added to object type `A`
```
## Usage
`GraphQL::SchemaComparator`, provides a simple api for Ruby applications to use.
## Docs
http://www.rubydoc.info/github/xuorig/graphql-schema_comparator/master/GraphQL/SchemaComparator
### GraphQL::SchemaComparator.compare
The compare method takes two arguments, `old_schema` and `new_schema`, the two schemas to compare.
You may provide schema IDL as strings, or provide instances of `GraphQL::Schema`.
The result of `compare` returns a `SchemaComparator::Result` object, from which you can
access information on the changes between the two schemas.
- `result.breaking?` returns true if any breaking changes were found between the two schemas
- `result.identical?` returns true if the two schemas were identical
- `result.breaking_changes` returns the list of breaking changes found between schemas.
- `result.non_breaking_changes` returns the list of non-breaking changes found between schemas.
- `result.dangerous_changes` returns the list of dangerous changes found between schemas.
- `result.changes` returns the full list of change objects.
### Change Objects
`GraphQL::SchemaComparator` returns a list of change objects. These change objects
all inherit from `Changes::AbstractChange`
Possible changes are all found in [changes.rb](lib/graphql/schema_comparator/changes.rb).
### Change Criticality
Each change object has a `#criticality` method which returns a `Changes::Criticality` object.
This objects defines how dangerous a change is to a schema.
The different levels of criticality (non_breaking, dangerous, breaking) are explained here:
https://github.com/xuorig/graphql-schema_comparator/blob/master/lib/graphql/schema_comparator/changes/criticality.rb#L6-L19
The gem is available as open source under the terms of the [MIT License](http://opensource.org/licenses/MIT).