Class: CouchPotato::Database

Inherits:
Object
  • Object
show all
Defined in:
lib/couch_potato/database.rb

Defined Under Namespace

Classes: ValidationsFailedError

Instance Method Summary collapse

Constructor Details

#initialize(couchrest_database) ⇒ Database

Returns a new instance of Database.



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# File 'lib/couch_potato/database.rb', line 6

def initialize(couchrest_database)
  @couchrest_database = couchrest_database
end

Instance Method Details

#couchrest_database ⇒ Object

returns the underlying CouchRest::Database instance



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# File 'lib/couch_potato/database.rb', line 148

def couchrest_database
  @couchrest_database
end

#destroy_document(document) ⇒ Object Also known as: destroy 



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# File 'lib/couch_potato/database.rb', line 101

def destroy_document(document)
  begin
    destroy_document_without_conflict_handling document
  rescue RestClient::Conflict
    retry if document = document.reload
  end
end

#first(spec) ⇒ Object

returns the first result from a #view query or nil



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# File 'lib/couch_potato/database.rb', line 60

def first(spec)
  spec.view_parameters = spec.view_parameters.merge({:limit => 1})
  view(spec).first
end

#first!(spec) ⇒ Object

returns th first result from a #view or raises CouchPotato::NotFound



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# File 'lib/couch_potato/database.rb', line 66

def first!(spec)
  first(spec) || raise(CouchPotato::NotFound)
end

#inspect ⇒ Object

:nodoc:



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# File 'lib/couch_potato/database.rb', line 143

def inspect #:nodoc:
  "#<CouchPotato::Database @root=\"#{couchrest_database.root}\">"
end

#load!(id) ⇒ Object

loads one or more documents by its id(s) behaves like #load except it raises a CouchPotato::NotFound if any of the documents could not be found

Raises:



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# File 'lib/couch_potato/database.rb', line 134

def load!(id)
  doc = load(id)
  if id.is_a?(Array)
    missing_docs = id - doc.map(&:id)
  end
  raise(CouchPotato::NotFound, missing_docs.try(:join, ', ')) if doc.nil? || missing_docs.try(:any?)
  doc
end

#load_document(id) ⇒ Object Also known as: load

loads a document by its id(s) id - either a single id or an array of ids returns either a single document or an array of documents (if an array of ids was passed). returns nil if the single document could not be found. when passing an array and some documents could not be found these are omitted from the returned array



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# File 'lib/couch_potato/database.rb', line 115

def load_document(id)
  raise "Can't load a document without an id (got nil)" if id.nil?

  if id.is_a?(Array)
    bulk_load id
  else
    begin
      instance = couchrest_database.get(id)
      instance.database = self
      instance
    rescue(RestClient::ResourceNotFound)
      nil
    end
  end
end

#save_document(document, validate = true, &block) ⇒ Object Also known as: save

saves a document. returns true on success, false on failure. if passed a block will:

  • yield the object to be saved to the block and run if once before saving

  • on conflict: reload the document, run the block again and retry saving



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# File 'lib/couch_potato/database.rb', line 74

def save_document(document, validate = true, &block)
  retries = 0
  begin
    block.call document if block
    save_document_without_conflict_handling(document, validate)
  rescue RestClient::Conflict => e
    if block
      document = document.reload
      if retries == 5
        raise CouchPotato::Conflict.new
      else
        retries += 1
        retry
      end
    else
      raise e
    end
  end
end

#save_document!(document) ⇒ Object Also known as: save!

saves a document, raises a CouchPotato::Database::ValidationsFailedError on failure



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# File 'lib/couch_potato/database.rb', line 96

def save_document!(document)
  save_document(document) || raise(ValidationsFailedError.new(document.errors.full_messages))
end

#view(spec) ⇒ Object

executes a view and return the results. you pass in a view spec which is usually a result of a SomePersistentClass.some_view call.

Example:

class User
  include CouchPotato::Persistence
  property :age
  view :all, key: :age
end
db = CouchPotato.database

db.view(User.all) # => [user1, user2]

You can pass the usual parameters you can pass to a couchdb view to the view:

db.view(User.all(limit: 5, startkey: 2, reduce: false))

For your convenience when passing a hash with only a key parameter you can just pass in the value

db.view(User.all(key: 1)) == db.view(User.all(1))

Instead of passing a startkey and endkey you can pass in a key with a range:

db.view(User.all(key: 1..20)) == db.view(startkey: 1, endkey: 20) == db.view(User.all(1..20))

You can also pass in multiple keys:

db.view(User.all(keys: [1, 2, 3]))



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# File 'lib/couch_potato/database.rb', line 39

def view(spec)
  results = CouchPotato::View::ViewQuery.new(
    couchrest_database,
    spec.design_document,
    {spec.view_name => {
      :map => spec.map_function,
      :reduce => spec.reduce_function
    }
    },
    ({spec.list_name => spec.list_function} unless spec.list_name.nil?),
    spec.lib,
    spec.language
  ).query_view!(spec.view_parameters)
  processed_results = spec.process_results results
  processed_results.each do |document|
    document.database = self if document.respond_to?(:database=)
  end if processed_results.respond_to?(:each)
  processed_results
end