Class: Nested::Resource

Inherits:
Object
  • Object
show all
Includes:
WithSingleton
Defined in:
lib/nested/resource.rb

Direct Known Subclasses

Many, One, Singleton

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from WithSingleton

#singleton, #singleton_if

Constructor Details

#initialize(app, sinatra, name, parent, resource_if_block, model_block) ⇒ Resource

Returns a new instance of Resource.



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# File 'lib/nested/resource.rb', line 7

def initialize(app, sinatra, name, parent, resource_if_block, model_block)
  raise "resource must be given a name" unless name

  @app = app
  @sinatra = sinatra
  @name = name
  @parent = parent
  @resources = []
  @actions = []

  raise "resource_if_block is nil, pass Nested::PROC_TRUE instead" unless resource_if_block
  @resource_if_block = resource_if_block

  unless @model_block = model_block
    if is_a?(One)
      @model_block = default_model_block
    else
      @model_block = resource_if_block != PROC_TRUE ? parent.try(:model_block) : default_model_block
    end
  end

  raise "no model_block passed and could not lookup any parent or default model_block" unless @model_block

  @before_blocks = []
  @after_blocks = []

  @serializer = initialize_serializer_factory
end

Instance Attribute Details

#actions ⇒ Object (readonly)

Returns the value of attribute actions.



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# File 'lib/nested/resource.rb', line 3

def actions
  @actions
end

#after_blocks ⇒ Object (readonly)

Returns the value of attribute after_blocks.



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# File 'lib/nested/resource.rb', line 3

def after_blocks
  @after_blocks
end

#before_blocks ⇒ Object (readonly)

Returns the value of attribute before_blocks.



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# File 'lib/nested/resource.rb', line 3

def before_blocks
  @before_blocks
end

#model_block ⇒ Object (readonly)

Returns the value of attribute model_block.



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# File 'lib/nested/resource.rb', line 3

def model_block
  @model_block
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/nested/resource.rb', line 3

def name
  @name
end

#parent ⇒ Object (readonly)

Returns the value of attribute parent.



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# File 'lib/nested/resource.rb', line 3

def parent
  @parent
end

#resources ⇒ Object (readonly)

Returns the value of attribute resources.



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# File 'lib/nested/resource.rb', line 3

def resources
  @resources
end

#serializer ⇒ Object (readonly)

Returns the value of attribute serializer.



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# File 'lib/nested/resource.rb', line 3

def serializer
  @serializer
end

#sinatra ⇒ Object (readonly)

Returns the value of attribute sinatra.



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# File 'lib/nested/resource.rb', line 3

def sinatra
  @sinatra
end

Instance Method Details

#after(&block) ⇒ Object 



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# File 'lib/nested/resource.rb', line 63

def after(&block)
  @after_blocks << block
  self
end

#before(&block) ⇒ Object 



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# File 'lib/nested/resource.rb', line 58

def before(&block)
  @before_blocks << block
  self
end

#behave(name) ⇒ Object 



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# File 'lib/nested/resource.rb', line 36

def behave(name)
  instance_exec(&@app.behaviors[name])
end

#child_resource(name, clazz, resource_if_block, model_block, &block) ⇒ Object 



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# File 'lib/nested/resource.rb', line 44

def child_resource(name, clazz, resource_if_block, model_block, &block)
   clazz.new(@app, @sinatra, name, self, resource_if_block, model_block)
    .tap{|r| r.instance_eval(&(block||Proc.new{ }))}
    .tap{|r| @resources << r}
end

#create_sinatra_route(method, action, method_if_block, &block) ⇒ Object 



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# File 'lib/nested/resource.rb', line 243

def create_sinatra_route(method, action, method_if_block, &block)
  @actions << {method: method, action: action, block: block}

  resource = self

  route = resource.route(action)

  @sinatra.send(method, route) do
    def self.error(message)
      errors.add(:base, message)
    end

    def self.errors
      @__errors ||= ActiveModel::Errors.new({})
    end

    begin
      content_type :json

      resource.self_and_parents.reverse.each do |res|
        res.sinatra_init(self)
      end

      raise "method_if_block returns false for method: #{method}, action: #{action}, resource: #{resource.name}" unless instance_exec(&method_if_block)

      resource.send(:"sinatra_exec_#{method}_block", self, &block)

      resource.sinatra_response(self, method)
    rescue Exception => e
      context_arr = []
      context_arr << "route: #{route}"
      context_arr << "method: #{method}"
      context_arr << "action: #{action}"

      context_arr << "resource: #{resource.name} (#{resource.class.name})"
      resource_object = instance_variable_get("@#{resource.instance_variable_name}")
      context_arr << "@#{resource.instance_variable_name}: #{resource_object.inspect}"

      parent = resource.try(:parent)

      if parent
        context_arr << "parent: #{parent.name} (#{parent.class.name})"
        parent_object = instance_variable_get("@#{parent.instance_variable_name}")
        context_arr << "@#{parent.instance_variable_name}: #{parent_object.inspect}"
      end

      puts context_arr.join("\n")
      raise e
    end
  end
end

#default_model_block ⇒ Object 



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# File 'lib/nested/resource.rb', line 50

def default_model_block
  raise "implement me"
end

#initialize_serializer_factory ⇒ Object 



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# File 'lib/nested/resource.rb', line 40

def initialize_serializer_factory
  Serializer.new([])
end

#instance_variable_name ⇒ Object 



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# File 'lib/nested/resource.rb', line 112

def instance_variable_name
  @name
end

#parents ⇒ Object 



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# File 'lib/nested/resource.rb', line 116

def parents
  (@parent ? @parent.parents + [@parent] : [])
end

#route(action = nil) ⇒ Object 



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# File 'lib/nested/resource.rb', line 90

def route(action=nil)
  "".tap do |r|
    r << @parent.route if @parent
    r << to_route_part
    r << "/#{action}" if action
  end
end

#route_replace(route, args) ⇒ Object 



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# File 'lib/nested/resource.rb', line 83

def route_replace(route, args)
  args.each do |k, v|
    route = route.gsub(":#{k}", "#{v}")
  end
  route
end

#self_and_parents ⇒ Object 



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# File 'lib/nested/resource.rb', line 120

def self_and_parents
  (self.parents + [self]).reverse
end

#serialize(*args) ⇒ Object 



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# File 'lib/nested/resource.rb', line 68

def serialize(*args)
  args.each {|arg| serializer + arg }
  self
end

#serialize_exclude_if(condition, *args) ⇒ Object 



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# File 'lib/nested/resource.rb', line 78

def serialize_exclude_if(condition, *args)
  args.each {|arg| @serializer - SerializerField.new(arg, condition) }
  self
end

#serialize_include_if(condition, *args) ⇒ Object 



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# File 'lib/nested/resource.rb', line 73

def serialize_include_if(condition, *args)
  args.each {|arg| @serializer + SerializerField.new(arg, condition) }
  self
end

#sinatra_errors_to_hash(errors) ⇒ Object 



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# File 'lib/nested/resource.rb', line 231

def sinatra_errors_to_hash(errors)
  errors.to_hash.inject({}) do |memo, e|
    memo[e[0]] = e[1][0]
    memo
  end
end

#sinatra_exec_delete_block(sinatra, &block) ⇒ Object 



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# File 'lib/nested/resource.rb', line 162

def sinatra_exec_delete_block(sinatra, &block)
  sinatra_init_data(:delete, sinatra, &block)
  sinatra.instance_exec(*sinatra.instance_variable_get("@__data"), &block)
end

#sinatra_exec_get_block(sinatra, &block) ⇒ Object 



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# File 'lib/nested/resource.rb', line 157

def sinatra_exec_get_block(sinatra, &block)
  sinatra_init_data(:get, sinatra, &block)
  sinatra.instance_exec(*sinatra.instance_variable_get("@__data"), &block)
end

#sinatra_exec_post_block(sinatra, &block) ⇒ Object 



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# File 'lib/nested/resource.rb', line 186

def sinatra_exec_post_block(sinatra, &block)
  sinatra_init_data(:post, sinatra, &block)
  res = sinatra.instance_exec(*sinatra.instance_variable_get("@__data"), &block)
  sinatra.instance_variable_set("@#{self.instance_variable_name}", res)
  # TODO: do we need to check for existing variables here?
  # sinatra_set_instance_variable(sinatra, self.instance_variable_name, res)
end

#sinatra_exec_put_block(sinatra, &block) ⇒ Object 



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# File 'lib/nested/resource.rb', line 181

def sinatra_exec_put_block(sinatra, &block)
  sinatra_init_data(:put, sinatra, &block)
  sinatra.instance_exec(*sinatra.instance_variable_get("@__data"), &block)
end

#sinatra_init(sinatra) ⇒ Object 



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# File 'lib/nested/resource.rb', line 131

def sinatra_init(sinatra)
  sinatra_init_set_resource(sinatra)

  raise "resource_if is false for resource: #{self.name} " unless sinatra.instance_exec(&@resource_if_block)

  sinatra_init_before(sinatra)
  sinatra_init_set_model(sinatra)
  sinatra_init_after(sinatra)
end

#sinatra_init_after(sinatra) ⇒ Object 



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# File 'lib/nested/resource.rb', line 153

def sinatra_init_after(sinatra)
  @after_blocks.each{|e| sinatra.instance_exec(&e)}
end

#sinatra_init_before(sinatra) ⇒ Object 



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# File 'lib/nested/resource.rb', line 149

def sinatra_init_before(sinatra)
  @before_blocks.each{|e| sinatra.instance_exec(&e)}
end

#sinatra_init_data(method, sinatra, &block) ⇒ Object 



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# File 'lib/nested/resource.rb', line 167

def sinatra_init_data(method, sinatra, &block)
  raw_data = if [:put, :post].include?(method)
    sinatra.request.body.rewind
    HashWithIndifferentAccess.new(JSON.parse(sinatra.request.body.read))
  elsif [:get, :delete].include?(method)
    sinatra.params
  else
    {}
  end

  sinatra.instance_variable_set("@__raw_data", raw_data)
  sinatra.instance_variable_set("@__data", raw_data.values_at(*block.parameters.map(&:last)))
end

#sinatra_init_set_model(sinatra) ⇒ Object 



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# File 'lib/nested/resource.rb', line 145

def sinatra_init_set_model(sinatra)
  sinatra.instance_variable_set("@#{self.instance_variable_name}", sinatra.instance_exec(*(@model_block.parameters.empty? ? [] : [sinatra.instance_exec(&default_model_block)]), &@model_block))
end

#sinatra_init_set_resource(sinatra) ⇒ Object 



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# File 'lib/nested/resource.rb', line 141

def sinatra_init_set_resource(sinatra)
  sinatra.instance_variable_set("@__resource", self)
end

#sinatra_response(sinatra, method) ⇒ Object 



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# File 'lib/nested/resource.rb', line 198

def sinatra_response(sinatra, method)
  response = if sinatra.errors.empty?
    sinatra.instance_variable_get("@#{self.instance_variable_name}")
  else
    sinatra.errors
  end

  response = self.send(:"sinatra_response_create_#{sinatra_response_type(response)}", sinatra, response, method)

  case response
    when Nested::Redirect then
      sinatra.redirect(response.url)
    when String then
      response
    else
      response.to_json
  end
end

#sinatra_response_create_data(sinatra, response, method) ⇒ Object 



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# File 'lib/nested/resource.rb', line 221

def sinatra_response_create_data(sinatra, response, method)
  data = if response && (is_a?(Many) || response.is_a?(Array)) && method != :post
    response.to_a.map{|e| sinatra.instance_exec(e, &@serializer.serialize) }
  else
    sinatra.instance_exec(response, &@serializer.serialize)
  end

  {data: data, ok: true}
end

#sinatra_response_create_error(sinatra, response, method) ⇒ Object 



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# File 'lib/nested/resource.rb', line 238

def sinatra_response_create_error(sinatra, response, method)
  errors = response.is_a?(ActiveModel::Errors) ? response : response.errors
  {data: sinatra_errors_to_hash(errors), ok: false}
end

#sinatra_response_create_redirect(sinatra, response, method) ⇒ Object 



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# File 'lib/nested/resource.rb', line 217

def sinatra_response_create_redirect(sinatra, response, method)
  response
end

#sinatra_response_type(response) ⇒ Object 



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# File 'lib/nested/resource.rb', line 194

def sinatra_response_type(response)
  (response.is_a?(ActiveModel::Errors) || (response.respond_to?(:errors) && !response.errors.empty?)) ? :error : (response.is_a?(Nested::Redirect) ? :redirect : :data)
end

#sinatra_set_instance_variable(sinatra, name, value) ⇒ Object 



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# File 'lib/nested/resource.rb', line 126

def sinatra_set_instance_variable(sinatra, name, value)
  raise "variable @#{name} already defined" if sinatra.instance_variable_defined?(:"@#{name}")
  sinatra.instance_variable_set(:"@#{name}", value)
end

#to_route_part ⇒ Object 



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# File 'lib/nested/resource.rb', line 54

def to_route_part
  "/#{@name}"
end