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module Gitlab
module ImportExport
# Generates a hash that conforms with http://apidock.com/rails/Hash/to_json
# and its peculiar options.
class JsonHashBuilder
def self.build(model_objects, attributes_finder)
new(model_objects, attributes_finder).build
end
def initialize(model_objects, attributes_finder)
@model_objects = model_objects
@attributes_finder = attributes_finder
end
def build
process_model_objects(@model_objects)
end
private
# Called when the model is actually a hash containing other relations (more models)
# Returns the config in the right format for calling +to_json+
#
# +model_object_hash+ - A model relationship such as:
# {:merge_requests=>[:merge_request_diff, :notes]}
def process_model_objects(model_object_hash)
json_config_hash = {}
current_key = model_object_hash.keys.first
model_object_hash.values.flatten.each do |model_object|
@attributes_finder.parse(current_key) { |hash| json_config_hash[current_key] ||= hash }
handle_model_object(current_key, model_object, json_config_hash)
end
json_config_hash
end
# Creates or adds to an existing hash an individual model or list
#
# +current_key+ main model that will be a key in the hash
# +model_object+ model or list of models to include in the hash
# +json_config_hash+ the original hash containing the root model
def handle_model_object(current_key, model_object, json_config_hash)
model_or_sub_model = model_object.is_a?(Hash) ? process_model_objects(model_object) : model_object
if json_config_hash[current_key]
add_model_value(current_key, model_or_sub_model, json_config_hash)
else
create_model_value(current_key, model_or_sub_model, json_config_hash)
end
end
# Constructs a new hash that will hold the configuration for that particular object
# It may include exceptions or other attribute detail configuration, parsed by +@attributes_finder+
#
# +current_key+ main model that will be a key in the hash
# +value+ existing model to be included in the hash
# +json_config_hash+ the original hash containing the root model
def create_model_value(current_key, value, json_config_hash)
json_config_hash[current_key] = parse_hash(value) || { include: value }
end
# Calls attributes finder to parse the hash and add any attributes to it
#
# +value+ existing model to be included in the hash
# +parsed_hash+ the original hash
def parse_hash(value)
@attributes_finder.parse(value) do |hash|
{ include: hash_or_merge(value, hash) }
end
end
# Adds new model configuration to an existing hash with key +current_key+
# It may include exceptions or other attribute detail configuration, parsed by +@attributes_finder+
#
# +current_key+ main model that will be a key in the hash
# +value+ existing model to be included in the hash
# +json_config_hash+ the original hash containing the root model
def add_model_value(current_key, value, json_config_hash)
@attributes_finder.parse(value) { |hash| value = { value => hash } }
add_to_array(current_key, json_config_hash, value)
end
# Adds new model configuration to an existing hash with key +current_key+
# it creates a new array if it was previously a single value
#
# +current_key+ main model that will be a key in the hash
# +value+ existing model to be included in the hash
# +json_config_hash+ the original hash containing the root model
def add_to_array(current_key, json_config_hash, value)
old_values = json_config_hash[current_key][:include]
json_config_hash[current_key][:include] = ([old_values] + [value]).compact.flatten
end
# Construct a new hash or merge with an existing one a model configuration
# This is to fulfil +to_json+ requirements.
#
# +hash+ hash containing configuration generated mainly from +@attributes_finder+
# +value+ existing model to be included in the hash
def hash_or_merge(value, hash)
value.is_a?(Hash) ? value.merge(hash) : { value => hash }
end
end
end
end
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