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module GraphqlHelpers
MutationDefinition = Struct.new(:query, :variables)
# makes an underscored string look like a fieldname
# "merge_request" => "mergeRequest"
def self.fieldnamerize(underscored_field_name)
graphql_field_name = underscored_field_name.to_s.camelize
graphql_field_name[0] = graphql_field_name[0].downcase
graphql_field_name
end
# Run a loader's named resolver
def resolve(resolver_class, obj: nil, args: {}, ctx: {})
resolver_class.new(object: obj, context: ctx).resolve(args)
end
# Runs a block inside a BatchLoader::Executor wrapper
def batch(max_queries: nil, &blk)
wrapper = proc do
begin
BatchLoader::Executor.ensure_current
yield
ensure
BatchLoader::Executor.clear_current
end
end
if max_queries
result = nil
expect { result = wrapper.call }.not_to exceed_query_limit(max_queries)
result
else
wrapper.call
end
end
def graphql_query_for(name, attributes = {}, fields = nil)
<<~QUERY
{
#{query_graphql_field(name, attributes, fields)}
}
QUERY
end
def graphql_mutation(name, input, fields = nil)
mutation_name = GraphqlHelpers.fieldnamerize(name)
input_variable_name = "$#{input_variable_name_for_mutation(name)}"
mutation_field = GitlabSchema.mutation.fields[mutation_name]
fields ||= all_graphql_fields_for(mutation_field.type)
query = <<~MUTATION
mutation(#{input_variable_name}: #{mutation_field.arguments['input'].type}) {
#{mutation_name}(input: #{input_variable_name}) {
#{fields}
}
}
MUTATION
variables = variables_for_mutation(name, input)
MutationDefinition.new(query, variables)
end
def variables_for_mutation(name, input)
graphql_input = input.map { |name, value| [GraphqlHelpers.fieldnamerize(name), value] }.to_h
{ input_variable_name_for_mutation(name) => graphql_input }.to_json
end
def input_variable_name_for_mutation(mutation_name)
mutation_name = GraphqlHelpers.fieldnamerize(mutation_name)
mutation_field = GitlabSchema.mutation.fields[mutation_name]
input_type = field_type(mutation_field.arguments['input'])
GraphqlHelpers.fieldnamerize(input_type)
end
def query_graphql_field(name, attributes = {}, fields = nil)
fields ||= all_graphql_fields_for(name.classify)
attributes = attributes_to_graphql(attributes)
<<~QUERY
#{name}(#{attributes}) {
#{fields}
}
QUERY
end
def all_graphql_fields_for(class_name)
type = GitlabSchema.types[class_name.to_s]
return "" unless type
type.fields.map do |name, field|
# We can't guess arguments, so skip fields that require them
next if required_arguments?(field)
if nested_fields?(field)
"#{name} { #{all_graphql_fields_for(field_type(field))} }"
else
name
end
end.compact.join("\n")
end
def attributes_to_graphql(attributes)
attributes.map do |name, value|
"#{GraphqlHelpers.fieldnamerize(name.to_s)}: \"#{value}\""
end.join(", ")
end
def post_graphql(query, current_user: nil, variables: nil)
post api('/', current_user, version: 'graphql'), params: { query: query, variables: variables }
end
def post_graphql_mutation(mutation, current_user: nil)
post_graphql(mutation.query, current_user: current_user, variables: mutation.variables)
end
def graphql_data
json_response['data']
end
def graphql_errors
json_response['errors']
end
def graphql_mutation_response(mutation_name)
graphql_data[GraphqlHelpers.fieldnamerize(mutation_name)]
end
def nested_fields?(field)
!scalar?(field) && !enum?(field)
end
def scalar?(field)
field_type(field).kind.scalar?
end
def enum?(field)
field_type(field).kind.enum?
end
def required_arguments?(field)
field.arguments.values.any? { |argument| argument.type.non_null? }
end
def field_type(field)
field_type = field.type
# The type could be nested. For example `[GraphQL::STRING_TYPE]`:
# - List
# - String!
# - String
field_type = field_type.of_type while field_type.respond_to?(:of_type)
field_type
end
end
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