Class: GraphQL::Api::Schema

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/api/schema.rb

Instance Method Summary collapse

Constructor Details

#initialize(commands: [], queries: [], models: []) ⇒ Schema

Returns a new instance of Schema.



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# File 'lib/graphql/api/schema.rb', line 20

def initialize(commands: [], queries: [], models: [])
  @types = {}
  @mutations = {}

  @load_commands = commands
  @load_queries = queries
  @load_models = models

  build_model_types
  build_mutations
  build_object_types
end

Instance Method Details

#all_commands ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 41

def all_commands
  @all_commands ||= all_constants('commands') + @load_commands
end

#all_models ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 33

def all_models
  @all_models ||= all_constants('models') + @load_models
end

#all_queries ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 37

def all_queries
  @all_queries ||= all_constants('queries') + @load_queries
end

#build_model_types ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 231

def build_model_types
  all_models.each { |model_class| @types[model_class] = create_type(model_class) }
end

#build_mutations ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 239

def build_mutations
  all_models.each do |model_class|
    @mutations[model_class] = [
        ["create#{model_class.name}", create_mutation(model_class)],
        ["update#{model_class.name}", update_mutation(model_class)],
        ["delete#{model_class.name}", delete_mutation(model_class)],
    ].map { |x| x if x[1] }.compact
  end

  all_commands.each do |command|
    if command.respond_to?(:actions) && command.actions.any?
      @mutations[command] = []
      command.actions.each do |action|
        @mutations[command] << ["#{action}#{command.name}", create_command_type(command, action)]
      end
    else
      @mutations[command] = [
          [command.name.camelize(:lower), create_command_type(command, :perform)]
      ]
    end
  end
end

#build_object_types ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 235

def build_object_types
  all_queries.each { |query| @types[query] = nil }
end

#create_command_type(object_type, action) ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 83

def create_command_type(object_type, action)
  object_types = @types
  prefix = action == :perform ? '' : action.capitalize

  GraphQL::Relay::Mutation.define do
    name "#{prefix}#{object_type.name}"
    description "Command #{object_type.name} #{action}"

    object_type.inputs.each do |input, type|
      input_field input, graphql_type_of(type)
    end

    object_type.returns.each do |return_name, return_type|
      return_field return_name, graphql_type_for_object(return_type, object_types)
    end

    resolve Resolvers::CommandMutation.new(object_type, action)
  end
end

#create_mutation(model_class) ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 103

def create_mutation(model_class)
  return nil unless model_class < ActiveRecord::Base

  object_types = @types

  GraphQL::Relay::Mutation.define do
    name "Create#{model_class.name}"
    description "Create #{model_class.name}"

    model_class.columns.each do |column|
      input_field column.name, graphql_type(column)
    end

    return_field model_class.name.underscore.to_sym, object_types[model_class]
    resolve Resolvers::ModelCreateMutation.new(model_class)
  end
end

#create_type(model_class) ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 45

def create_type(model_class)
  object_types = @types

  GraphQL::ObjectType.define do
    name model_class.name
    description "Get #{model_class.name}"

    if model_class.respond_to?(:columns)
      model_class.columns.each do |column|
        field column.name do
          type graphql_type(column)
          resolve Resolvers::Field.new(model_class, column.name)
        end
      end
    end

    if model_class.respond_to?(:fields)
      model_class.fields.each do |field_name, field_type|
        field field_name, graphql_type_of(field_type)
      end
    end

    if model_class.respond_to?(:reflections)
      model_class.reflections.each do |name, association|
        field name do
          if association.collection?
            type types[object_types[association.class_name.constantize]]
          else
            type object_types[association.class_name.constantize]
          end
          resolve Resolvers::Field.new(model_class, name)
        end
      end
    end

  end
end

#delete_mutation(model_class) ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 140

def delete_mutation(model_class)
  return nil unless model_class < ActiveRecord::Base

  object_types = @types

  GraphQL::Relay::Mutation.define do
    name "Delete#{model_class.name}"
    description "Delete #{model_class.name}"

    input_field :id, !types.ID

    return_field model_class.name.underscore.to_sym, object_types[model_class]
    resolve Resolvers::ModelDeleteMutation.new(model_class)
  end
end

#mutation(&block) ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 212

def mutation(&block)
  mutations = @mutations

  GraphQL::ObjectType.define do
    name 'Mutation'
    instance_eval(&block) if block

    mutations.each do |model_class, muts|
      muts.each do |mutation|
        field mutation[0], field: mutation[1].field
      end
    end
  end
end

#query(&block) ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 156

def query(&block)
  object_types = @types

  GraphQL::ObjectType.define do
    name 'Query'
    description 'The query root for this schema'

    instance_eval(&block) if block

    object_types.each do |object_class, graph_type|
      if object_class < ActiveRecord::Base

        field(object_class.name.camelize(:lower)) do
          type graph_type
          argument :id, types.ID

          if object_class.respond_to?(:arguments)
            object_class.arguments.each do |arg|
              argument arg, graphql_type(object_class.columns.find { |c| c.name.to_sym == arg.to_sym })
            end
          end

          resolve Resolvers::ModelFindQuery.new(object_class)
        end

        field(object_class.name.camelize(:lower).pluralize) do
          type types[graph_type]
          argument :limit, types.Int

          if object_class.respond_to?(:arguments)
            object_class.arguments.each do |arg|
              argument arg, graphql_type(object_class.columns.find { |c| c.name.to_sym == arg.to_sym })
            end
          end

          resolve Resolvers::ModelListQuery.new(object_class)
        end

      elsif object_class.respond_to?(:arguments) && object_class.respond_to?(:return_type)

        field(object_class.name.camelize(:lower)) do
          type(graphql_type_for_object(object_class.return_type, object_types))

          object_class.arguments.each do |argument_name, argument_type|
            argument argument_name, graphql_type_of(argument_type)
          end

          resolve Resolvers::QueryObjectQuery.new(object_class)
        end

      end
    end

  end
end

#schema ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 227

def schema
  @schema ||= GraphQL::Schema.define(query: query, mutation: mutation)
end

#update_mutation(model_class) ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 121

def update_mutation(model_class)
  return nil unless model_class < ActiveRecord::Base

  object_types = @types

  GraphQL::Relay::Mutation.define do
    name "Update#{model_class.name}"
    description "Update #{model_class.name}"

    input_field :id, !types.ID
    model_class.columns.each do |column|
      input_field column.name, graphql_type(column)
    end

    return_field model_class.name.underscore.to_sym, object_types[model_class]
    resolve Resolvers::ModelUpdateMutation.new(model_class)
  end
end