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# frozen_string_literal: true
module Graphql
# Helper to pass variables around generated queries.
#
# e.g.:
# first = var('Int')
# after = var('String')
#
# query = with_signature(
# [first, after],
# query_graphql_path([
# [:project, { full_path: project.full_path }],
# [:issues, { after: after, first: first }]
# :nodes
# ], all_graphql_fields_for('Issue'))
# )
#
# post_graphql(query, variables: [first.with(2), after.with(some_cursor)])
#
class Var
attr_reader :name, :type
attr_accessor :value
def initialize(name, type)
@name = name
@type = type
end
def sig
"#{to_graphql_value}: #{type}"
end
def to_graphql_value
"$#{name}"
end
# We return a new object so that running the same query twice with
# different values does not risk re-using the value
#
# e.g.
#
# x = var('Int')
# expect { post_graphql(query, variables: x) }
# .to issue_same_number_of_queries_as { post_graphql(query, variables: x.with(1)) }
#
# Here we post the `x` variable once with the value set to 1, and once with
# the value set to `nil`.
def with(value)
copy = Var.new(name, type)
copy.value = value
copy
end
def to_h
{ name => value }
end
end
end
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