0.01
The project is in a healthy, maintained state
A parser which converts dry-validation or dry-struct into valid swagger documentation
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 Dependencies
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Dry::Swagger

Generate a valid and up to date swagger documentation out of your dry-structs and dry-validations

The gem is still work in progress and is not yet fully tested.

Installation

Add this line to your application's Gemfile:

gem 'dry-swagger'

And then execute:

bundle install

After installing, execute the following command:

rake dry-swagger:install

This will generate configuration files in your project under project/config. See Configuration section for more details.

Usage

With Dry::Validation::Contract

Lets say we have the following Dry::Validation::Contract definition:

class TestContract < Dry::Validation::Contract
    params do
        required(:some_field).value(:str?, min_size?: 5, max_size?: 10)
        required(:some_array_of_objects).array(:hash) do
            required(:some_nested_attribute).value(:str?)
        end
        required(:some_array_of_integers).array(:int?)
        required(:dto).value(:hash) do
            optional(:some_nested_attribute).maybe(:str?)
        end
    end
end

parser = Dry::Swagger::ContractParser.new

parser.call(TestContract) will set the keys of the parser object to:

{
    :some_field => {
        :required => true,
        :type => "string",
        :description => "Minimum size: 5, Maximum size: 10"
    },
     :some_array_of_objects => { 
        :required => true,
        :array => true,
        :type => "array",
        :keys => {
            :some_nested_attribute => {
                :required=>true, :type=>"string"
            }
        }
     },
     :some_array_of_integers => {
        :required=>true, 
        :array=>true, 
        :type=>"integer"
     },
     :dto => {
        :required => true,
        :type => "hash",
        :keys => {
            :some_nested_attribute => {
                :required => false, 
                :"x-nullable"=>true, 
                :type=>"string"
            }
        }
     }
}

As we can see, the ContractParser goes through all the params defined in the schema and generates a hash. The hash is saved in the keys attribute of the parser, so that we can call to_swagger later.

The required key in our result will be set to true if the field is defined as required(:field_name), and false if defined as optional(:field_name).

The "x-nullable" key depends on whether we have defined the field as value, maybe or filled.

For nested objects like array of objects or hash, we add a keys field with a definition for each field inside the nested hash.

If the field is an array of primitive type, the type field will equal to the primitive type, and a array flag will be set on the field.

Calling parser.to_swagger will give the following result:

{
  "type": "object",
  "properties": {
    "some_field": {
      "type": "string",
      "description": "Minimum size: 5, Maximum size: 10",
      "x-nullable": false
    },
    "some_array_of_objects": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "some_nested_attribute": {
            "type": "string",
            "x-nullable": false
          }
        },
        "required": [
          "some_nested_attribute"
        ],
        "x-nullable": false
      },
      "x-nullable": false
    },
    "some_array_of_integers": {
      "type": "array",
      "items": {
        "type": "integer",
        "x-nullable": false
      },
      "x-nullable": false
    },
    "dto": {
      "type": "object",
      "properties": {
        "some_nested_attribute": {
          "type": "string",
          "x-nullable": true
        }
      },
      "required": [

      ],
      "x-nullable": false
    }
  },
  "required": [
    "some_field",
    "some_array_of_objects",
    "some_array_of_integers",
    "dto"
  ]
}

With Dry::Struct

The Dry::Swagger::StructParser works the same as the contract parser.

The required key depends on whether we define the field as attribute or attribute?

The "x-nullable" key depends on whether we define the type as Type or Type.optional.

For more complex types, for example DTO1 | DTO2 or Types::Array.of(DTO1 | DTO2), the parser converts the field value to an array of both schemas.

Example:

class DTO1 < Dry::Struct
    attribute :dto1_field, Types::String
end

class DTO2 < Dry::Struct
    attribute :dto2_field, Types::String
end

class DTO < Dry::Struct
    attribute :dynamic_dto, DTO1 | DTO2
end
parser = Dry::Swagger::StructParser.new

parser.call(DTO)
=> {
     "dynamic_dto": [ # ARRAY
       {
         "type": "hash",
         "required": true,
         "x-nullable": false,
         "keys": {
           "dto1_field": {
             "type": "string",
             "required": true,
             "x-nullable": false
           }
         }
       },
       {
         "type": "hash",
         "required": true,
         "x-nullable": false,
         "keys": {
           "dto2_field": {
             "type": "string",
             "required": true,
             "x-nullable": false
           }
         }
       }
     ]
   }

Calling parser.to_swagger will give the following result:

{
  "type": "object",
  "properties": {
    "dynamic_dto": {
      "type": "object",
      "properties": {
        "definition_1": {
          "type": "object",
          "properties": {
            "dto1_field": {
              "type": "string",
              "x-nullable": false
            }
          },
          "required": [
            "dto1_field"
          ],
          "x-nullable": false
        },
        "definition_2": {
          "type": "object",
          "properties": {
            "dto2_field": {
              "type": "string",
              "x-nullable": false
            }
          },
          "required": [
            "dto2_field"
          ],
          "x-nullable": false
        }
      },
      "example": "Dynamic Field. See Model Definitions",
      "oneOf": [
        {
          "type": "object",
          "properties": {
            "dto1_field": {
              "type": "string",
              "x-nullable": false
            }
          },
          "required": [
            "dto1_field"
          ],
          "x-nullable": false
        },
        {
          "type": "object",
          "properties": {
            "dto2_field": {
              "type": "string",
              "x-nullable": false
            }
          },
          "required": [
            "dto2_field"
          ],
          "x-nullable": false
        }
      ]
    }
  },
  "required": [
    "dynamic_dto"
  ]
}

Overriding fields

You can also modify the fields by passing a block after the .call() method.

Dry::Swagger::StructParser.new.call(DTO) do |it|
  # types = string/integer/hash/array
  
  # Remove a field
  its.keys = it.keys.except(:field_name) 
  
  # Add new field on root level
  it.keys[:new_field_name] = { type: type, required: true/false, :it.config.nullable_type=>true/false } 
  
  # Add a new field in nested hash/array
  it.keys[:nested_field][:keys][:new_field_name] = { 
    type: type, required: true/false, :it.config.nullable_type=>true/false
  }
  
  # Remove a field in nested hash/array
  it.keys = it.keys[:nested_field][:keys].except(:field_name)
  
  # Add an array or hash
  it.keys[:nested_field] = { 
    type: "array/hash", required: true/false, :it.config.nullable_type=> true/false, keys: {
      # List all nested fields
      new_field: { type: :type, required: true/false, :it.config.nullable_type=>true/false }
    }
  }
  
  # Add an Array of primitive types, type field needs to be the element type(string, integer, float), 
  and add an array: true flag
  
  it.keys[:array_field_name] = { 
    type: type, array: true, required: true/false, :it.config.nullable_type=> true/false 
  }
  
end.to_swagger()

Custom Configuration For Your Project

You can override default configurations by changing the values in the config/initializers/dry-swagger.rb file generated from the rake command in the Installation section.

To modify the descriptions for the Contracts, modify the values in config/locale/dry-swagger.yml.

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/Jane-Terziev/dry-swagger. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the Dry::Swagger project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.