Class: CouchRest::ExtendedDocument

Inherits:
Document show all
Includes:
Callbacks, Mixins::ClassProxy, Mixins::DesignDoc, Mixins::DocumentQueries, Mixins::ExtendedAttachments, Mixins::Views
Defined in:
lib/couchrest/more/extended_document.rb

Overview

Same as CouchRest::Document but with properties and validations

Instance Attribute Summary collapse

Attributes inherited from Document

#database

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Mixins::ClassProxy

included

Methods included from Mixins::ExtendedAttachments

#attachment_url, #create_attachment, #delete_attachment, #has_attachment?, #read_attachment, #update_attachment

Methods included from Mixins::DesignDoc

included

Methods included from Mixins::Views

included

Methods included from Mixins::DocumentQueries

included

Methods included from Callbacks

included, #method_missing, #run_callbacks

Methods inherited from Document

#copy, #id, #new_document?, #rev, #uri, use_database

Methods included from Mixins::Attachments

#delete_attachment, #fetch_attachment, #put_attachment

Methods inherited from Response

#[], #[]=

Constructor Details

#initialize(passed_keys = {}) ⇒ ExtendedDocument

Returns a new instance of ExtendedDocument.



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# File 'lib/couchrest/more/extended_document.rb', line 34

def initialize(passed_keys={})
  apply_defaults # defined in CouchRest::Mixins::Properties
  super
  cast_keys      # defined in CouchRest::Mixins::Properties
  unless self['_id'] && self['_rev']
    self['couchrest-type'] = self.class.to_s
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class CouchRest::Callbacks

Instance Attribute Details

#casted_by ⇒ Object

Accessors



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# File 'lib/couchrest/more/extended_document.rb', line 26

def casted_by
  @casted_by
end

Class Method Details

.inherited(subklass) ⇒ Object 



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# File 'lib/couchrest/more/extended_document.rb', line 16

def self.inherited(subklass)
  subklass.send(:include, CouchRest::Mixins::Properties)
  subklass.class_eval <<-EOS, __FILE__, __LINE__
    def self.inherited(subklass)
      subklass.properties = self.properties.dup
    end
  EOS
end

.method_missing(m, *args, &block) ⇒ Object

Temp solution to make the view_by methods available



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# File 'lib/couchrest/more/extended_document.rb', line 81

def self.method_missing(m, *args, &block)
  if has_view?(m)
    query = args.shift || {}
    view(m, query, *args, &block)
  else
    super
  end
end

.timestamps! ⇒ Object

Automatically set updated_at and created_at fields on the document whenever saving occurs. CouchRest uses a pretty decent time format by default. See Time#to_json



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# File 'lib/couchrest/more/extended_document.rb', line 47

def self.timestamps!
  class_eval <<-EOS, __FILE__, __LINE__
    property(:updated_at, :read_only => true, :cast_as => 'Time', :auto_validation => false)
    property(:created_at, :read_only => true, :cast_as => 'Time', :auto_validation => false)
    
    save_callback :before do |object|
      object['updated_at'] = Time.now
      object['created_at'] = object['updated_at'] if object.new_document?
    end
  EOS
end

.unique_id(method = nil, &block) ⇒ Object

Name a method that will be called before the document is first saved, which returns a string to be used for the document’s _id. Because CouchDB enforces a constraint that each id must be unique, this can be used to enforce eg: uniq usernames. Note that this id must be globally unique across all document types which share a database, so if you’d like to scope uniqueness to this class, you should use the class name as part of the unique id.



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# File 'lib/couchrest/more/extended_document.rb', line 66

def self.unique_id method = nil, &block
  if method
    define_method :set_unique_id do
      self['_id'] ||= self.send(method)
    end
  elsif block
    define_method :set_unique_id do
      uniqid = block.call(self)
      raise ArgumentError, "unique_id block must not return nil" if uniqid.nil?
      self['_id'] ||= uniqid
    end
  end
end

Instance Method Details

#create(bulk = false) ⇒ Object

Trigger the callbacks (before, after, around) and create the document It’s important to have a create callback since you can’t check if a document was new after you saved it

When creating a document, both the create and the save callbacks will be triggered.



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# File 'lib/couchrest/more/extended_document.rb', line 129

def create(bulk = false)
  caught = catch(:halt)  do
    _run_create_callbacks do
        _run_save_callbacks do
          create_without_callbacks(bulk)
      end
    end
  end
end

#create! ⇒ Object

Creates the document in the db. Raises an exception if the document is not created properly.



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# File 'lib/couchrest/more/extended_document.rb', line 149

def create!
  raise "#{self.inspect} failed to save" unless self.create
end

#create_without_callbacks(bulk = false) ⇒ Object

unlike save, create returns the newly created document

Raises:

  • (ArgumentError) 


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# File 'lib/couchrest/more/extended_document.rb', line 140

def create_without_callbacks(bulk =false)
  raise ArgumentError, "a document requires a database to be created to (The document or the #{self.class} default database were not set)" unless database
  set_unique_id if new_document? && self.respond_to?(:set_unique_id)
  result = database.save_doc(self, bulk)
  (result["ok"] == true) ? self : false
end

#destroy(bulk = false) ⇒ Object

Deletes the document from the database. Runs the :destroy callbacks. Removes the _id and _rev fields, preparing the document to be saved to a new _id.



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# File 'lib/couchrest/more/extended_document.rb', line 201

def destroy(bulk=false)
  caught = catch(:halt)  do
    _run_destroy_callbacks do
      result = database.delete_doc(self, bulk)
      if result['ok']
        self.delete('_rev')
        self.delete('_id')
      end
      result['ok']
    end
  end
end

#properties ⇒ Object

Returns the Class properties

Returns

Array

the list of properties for the instance



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# File 'lib/couchrest/more/extended_document.rb', line 96

def properties
  self.class.properties
end

#save(bulk = false) ⇒ Object

Trigger the callbacks (before, after, around) and save the document



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# File 'lib/couchrest/more/extended_document.rb', line 171

def save(bulk = false)
  caught = catch(:halt)  do
    if self.new_document?
      _run_save_callbacks do
        save_without_callbacks(bulk)
      end
    else
      update(bulk)
    end
  end
end

#save! ⇒ Object

Saves the document to the db using save. Raises an exception if the document is not saved properly.



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# File 'lib/couchrest/more/extended_document.rb', line 194

def save!
  raise "#{self.inspect} failed to save" unless self.save
end

#save_without_callbacks(bulk = false) ⇒ Object

Overridden to set the unique ID. Returns a boolean value

Raises:

  • (ArgumentError) 


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# File 'lib/couchrest/more/extended_document.rb', line 185

def save_without_callbacks(bulk = false)
  raise ArgumentError, "a document requires a database to be saved to (The document or the #{self.class} default database were not set)" unless database
  set_unique_id if new_document? && self.respond_to?(:set_unique_id)
  result = database.save_doc(self, bulk)
  result["ok"] == true
end

#update(bulk = false) ⇒ Object

Trigger the callbacks (before, after, around) only if the document isn’t new



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# File 'lib/couchrest/more/extended_document.rb', line 155

def update(bulk = false)
  caught = catch(:halt)  do
    if self.new_document?
      save(bulk)
    else
      _run_update_callbacks do
        _run_save_callbacks do
          save_without_callbacks(bulk)
        end
      end
    end
  end
end

#update_attributes(hash) ⇒ Object

Takes a hash as argument, and applies the values by using writer methods for each key. Raises a NoMethodError if the corresponding methods are missing. In case of error, no attributes are changed.



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# File 'lib/couchrest/more/extended_document.rb', line 115

def update_attributes(hash)
  update_attributes_without_saving hash
  save
end

#update_attributes_without_saving(hash) ⇒ Object

Takes a hash as argument, and applies the values by using writer methods for each key. It doesn’t save the document at the end. Raises a NoMethodError if the corresponding methods are missing. In case of error, no attributes are changed.



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# File 'lib/couchrest/more/extended_document.rb', line 103

def update_attributes_without_saving(hash)
  hash.each do |k, v|
    raise NoMethodError, "#{k}= method not available, use property :#{k}" unless self.respond_to?("#{k}=")
  end      
  hash.each do |k, v|
    self.send("#{k}=",v)
  end
end