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# File 'lib/generators/graphql/relay.rb', line 5
def install_relay
template("node_type.erb", "#{options[:directory]}/types/node_type.rb")
in_root do
fields = " # Add `node(id: ID!) and `nodes(ids: [ID!]!)`\n include GraphQL::Types::Relay::HasNodeField\n include GraphQL::Types::Relay::HasNodesField\n\n"
inject_into_file "#{options[:directory]}/types/query_type.rb", fields, after: /class .*QueryType\s*<\s*[^\s]+?\n/m, force: false
end
template("base_connection.erb", "#{options[:directory]}/types/base_connection.rb")
template("base_edge.erb", "#{options[:directory]}/types/base_edge.rb")
connectionable_type_files = {
"#{options[:directory]}/types/base_object.rb" => /class .*BaseObject\s*<\s*[^\s]+?\n/m,
"#{options[:directory]}/types/base_union.rb" => /class .*BaseUnion\s*<\s*[^\s]+?\n/m,
"#{options[:directory]}/types/base_interface.rb" => /include GraphQL::Schema::Interface\n/m,
}
in_root do
connectionable_type_files.each do |type_class_file, sentinel|
inject_into_file type_class_file, " connection_type_class(Types::BaseConnection)\n", after: sentinel, force: false
inject_into_file type_class_file, " edge_type_class(Types::BaseEdge)\n", after: sentinel, force: false
end
end
schema_code = <<-RUBY
# Relay-style Object Identification:
# Return a string UUID for `object`
def self.id_from_object(object, type_definition, query_ctx)
# For example, use Rails' GlobalID library (https://github.com/rails/globalid):
object_id = object.to_global_id.to_s
# Remove this redundant prefix to make IDs shorter:
object_id = object_id.sub("gid://\#{GlobalID.app}/", "")
encoded_id = Base64.urlsafe_encode64(object_id)
# Remove the "=" padding
encoded_id = encoded_id.sub(/=+/, "")
# Add a type hint
type_hint = type_definition.graphql_name.first
"\#{type_hint}_\#{encoded_id}"
end
# Given a string UUID, find the object
def self.object_from_id(encoded_id_with_hint, query_ctx)
# For example, use Rails' GlobalID library (https://github.com/rails/globalid):
# Split off the type hint
_type_hint, encoded_id = encoded_id_with_hint.split("_", 2)
# Decode the ID
id = Base64.urlsafe_decode64(encoded_id)
# Rebuild it for Rails then find the object:
full_global_id = "gid://\#{GlobalID.app}/\#{id}"
GlobalID::Locator.locate(full_global_id)
end
RUBY
inject_into_file schema_file_path, schema_code, before: /^end\n/m, force: false
end
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