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 12

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 33

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 25

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 29

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 259

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 267

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|
    @mutations[command] = [
        [command.name.camelize(:lower), create_command_type(command)]
    ]
  end
end

#build_object_types ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 263

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

#create_command_type(object_type) ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 75

def create_command_type(object_type)
  object_types = @types

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

    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 -> (inputs, ctx) {
      object_type.new(inputs, ctx).perform
    }
  end
end

#create_mutation(model_class) ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 96

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 -> (inputs, ctx) {
      item = model_class.create!(inputs.to_h)
      {model_class.name.underscore.to_sym => item}
    }
  end
end

#create_type(model_class) ⇒ Object 



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

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 -> (obj, args, ctx) { graphql_fetch(obj, ctx, 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 -> (obj, args, ctx) { graphql_fetch(obj, ctx, name) }
        end
      end
    end

  end
end

#delete_mutation(model_class) ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 142

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

  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}_id".to_sym, types.ID

    resolve -> (inputs, ctx) {
      item = model_class.find(inputs[:id]).destroy!
      {"#{model_class.name.underscore}_id".to_sym => item.id}
    }
  end
end

#mutation(&block) ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 240

def mutation(&block)
  mutations = @mutations

  @mutation ||= 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 160

def query(&block)
  object_types = @types

  @query ||= 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 -> (obj, args, ctx) {
            if object_class.respond_to?(:graph_find)
              object_class.graph_find(args, ctx)
            else
              object_class.find_by!(args.to_h)
            end
          }
        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 -> (obj, args, ctx) {
            if object_class.respond_to?(:graph_where)
              object_class.graph_where(args, ctx)
            else
              eager_load = []
              ctx.irep_node.children.each do |child|
                eager_load << child[0] if object_class.reflections.find { |name, _| name == child[0] }
              end

              query_args = args.to_h
              query_args.delete('limit')

              q = object_class.where(query_args)
              q.eager_load(*eager_load) if eager_load.any?
              q.limit(args[:limit] || 30)
            end
          }
        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 -> (obj, args, ctx) {
            object_class.new(args, ctx).execute
          }
        end

      end
    end

  end
end

#schema ⇒ Object 



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# File 'lib/graphql/api/schema.rb', line 255

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 118

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 -> (inputs, ctx) {
      item = model_class.find(inputs[:id])
      item.update!(inputs.to_h)
      {model_class.name.underscore.to_sym => item}
    }
  end
end