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Versions: 37
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Contents
module GraphQL
class Query
# Read-only access to query variables, applying default values if needed.
class Variables
def initialize(schema, ast_variables, provided_variables)
@schema = schema
@provided_variables = provided_variables
@storage = ast_variables.each_with_object({}) do |ast_variable, memo|
variable_name = ast_variable.name
memo[variable_name] = get_graphql_value(ast_variable)
end
end
def [](key)
@storage.fetch(key)
end
private
# Find the right value for this variable:
# - First, use the value provided at runtime
# - Then, fall back to the default value from the query string
# If it's still nil, raise an error if it's required.
def get_graphql_value(ast_variable)
variable_type = @schema.type_from_ast(ast_variable.type)
variable_name = ast_variable.name
default_value = ast_variable.default_value
provided_value = @provided_variables[variable_name]
validation_result = variable_type.validate_input(provided_value)
if !validation_result.valid?
raise GraphQL::Query::VariableValidationError.new(ast_variable, variable_type, provided_value, validation_result)
elsif provided_value.nil?
GraphQL::Query::LiteralInput.coerce(variable_type, default_value, {})
else
variable_type.coerce_input(provided_value)
end
end
end
end
end
Version data entries
37 entries across 37 versions & 1 rubygems