Class: Wice::WiceGrid

Inherits:
Object show all
Defined in:
lib/wice_grid.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klass_or_relation, controller, opts = {}) ⇒ WiceGrid

core workflow methods START

Raises:



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# File 'lib/wice_grid.rb', line 66

def initialize(klass_or_relation, controller, opts = {})  #:nodoc:
  @controller = controller

  @relation = klass_or_relation
  @klass = klass_or_relation.is_a?(ActiveRecord::Relation) ?
    klass_or_relation.klass :
    klass_or_relation

  unless @klass.kind_of?(Class) && @klass.ancestors.index(ActiveRecord::Base)
    raise WiceGridArgumentError.new("ActiveRecord model class (second argument) must be a Class derived from ActiveRecord::Base")
  end

  # validate :with_resultset & :with_paginated_resultset
  [:with_resultset, :with_paginated_resultset].each do |callback_symbol|
    unless [NilClass, Symbol, Proc].index(opts[callback_symbol].class)
      raise WiceGridArgumentError.new(":#{callback_symbol} must be either a Proc or Symbol object")
    end
  end

  opts[:order_direction].downcase! if opts[:order_direction].kind_of?(String)

  # validate :order_direction
  if opts[:order_direction] && ! (opts[:order_direction] == 'asc'  ||
                                  opts[:order_direction] == :asc   ||
                                  opts[:order_direction] == 'desc' ||
                                  opts[:order_direction] == :desc)
    raise WiceGridArgumentError.new(":order_direction must be either 'asc' or 'desc'.")
  end

  # options that are understood
  @options = {
    :conditions           => nil,
    :csv_file_name        => nil,
    :csv_field_separator  => Defaults::CSV_FIELD_SEPARATOR,
    :custom_order         => {},
    :enable_export_to_csv => Defaults::ENABLE_EXPORT_TO_CSV,
    :group                => nil,
    :include              => nil,
    :joins                => nil,
    :name                 => Defaults::GRID_NAME,
    :order                => nil,
    :order_direction      => Defaults::ORDER_DIRECTION,
    :page                 => 1,
    :per_page             => Defaults::PER_PAGE,
    :saved_query          => nil,
    :total_entries        => nil,
    :with_paginated_resultset  => nil,
    :with_resultset       => nil
  }

  # validate parameters
  opts.assert_valid_keys(@options.keys)

  @options.merge!(opts)
  @export_to_csv_enabled = @options[:enable_export_to_csv]
  @csv_file_name = @options[:csv_file_name]
  @csv_field_separator = @options[:csv_field_separator]

  case @name = @options[:name]
  when String
  when Symbol
    @name = @name.to_s
  else
    raise WiceGridArgumentError.new("name of the grid should be a string or a symbol")
  end
  raise WiceGridArgumentError.new("name of the grid can only contain alphanumeruc characters") unless @name =~ /^[a-zA-Z\d_]*$/

  @table_column_matrix = TableColumnMatrix.new
  @table_column_matrix.default_model_class = @klass

  @ar_options = {}
  @status = HashWithIndifferentAccess.new

  if @options[:order]
    @options[:order] = @options[:order].to_s
    @options[:order_direction] = @options[:order_direction].to_s

    @status[:order_direction] = @options[:order_direction]
    @status[:order] = @options[:order]

  end
  @status[:total_entries] = @options[:total_entries]
  @status[:per_page] = @options[:per_page]
  @status[:page] = @options[:page]
  @status[:conditions] = @options[:conditions]
  @status[:f] = @options[:f]

  process_loading_query
  process_params

  @ar_options_formed = false

end

Instance Attribute Details

#ar_options ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 60

def ar_options
  @ar_options
end

#csv_field_separator ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 60

def csv_field_separator
  @csv_field_separator
end

#csv_file_name ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 60

def csv_file_name
  @csv_file_name
end

#csv_tempfile ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 62

def csv_tempfile
  @csv_tempfile
end

#custom_order ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 59

def custom_order
  @custom_order
end

#export_to_csv_enabled ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 60

def export_to_csv_enabled
  @export_to_csv_enabled
end

#klass ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 59

def klass
  @klass
end

#name ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 59

def name
  @name
end

#output_buffer ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 62

def output_buffer
  @output_buffer
end

#query_store_model ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 59

def query_store_model
  @query_store_model
end

#renderer=(value) ⇒ Object (writeonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 61

def renderer=(value)
  @renderer = value
end

#resultset ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 59

def resultset
  @resultset
end

#saved_query ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 60

def saved_query
  @saved_query
end

#status ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 60

def status
  @status
end

#view_helper_finished ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 62

def view_helper_finished
  @view_helper_finished
end

Instance Method Details

#all_pages_records ⇒ Object

Returns the list of objects browsable through all pages with the current filters. Should only be called after the grid helper.

Raises:



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# File 'lib/wice_grid.rb', line 451

def all_pages_records
  raise WiceGridException.new("all_pages_records can only be called only after the grid view helper") unless self.view_helper_finished
  resultset_without_paging_with_user_filters
end

#all_record_mode? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/wice_grid.rb', line 438

def all_record_mode? #:nodoc:
  @status[:pp]
end

#count ⇒ Object Also known as: size

:nodoc:



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# File 'lib/wice_grid.rb', line 393

def count  #:nodoc:
  form_ar_options(:skip_ordering => true, :forget_generated_options => true)
  @relation.count(:conditions => @ar_options[:conditions], :joins => @ar_options[:joins], :include => @ar_options[:include], :group => @ar_options[:group])
end

#current_page_records ⇒ Object

Returns the list of objects displayed on current page. Should only be called after the grid helper.

Raises:



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# File 'lib/wice_grid.rb', line 457

def current_page_records
  raise WiceGridException.new("current_page_records can only be called only after the grid view helper") unless self.view_helper_finished
  @resultset
end

#declare_column(column_name, model, custom_filter_active, table_alias, filter_type) ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 207

def declare_column(column_name, model, custom_filter_active, table_alias, filter_type)  #:nodoc:
  if model # this is an included table
    column = @table_column_matrix.get_column_by_model_class_and_column_name(model, column_name)
    raise WiceGridArgumentError.new("Column '#{column_name}' is not found in table '#{model.table_name}'!") if column.nil?
    main_table = false
    table_name = model.table_name
  else
    column = @table_column_matrix.get_column_in_default_model_class_by_column_name(column_name)
    if column.nil?
      raise WiceGridArgumentError.new("Column '#{column_name}' is not found in table '#{@klass.table_name}'! " +
        "If '#{column_name}' belongs to another table you should declare it in :include or :join when initialising " +
        "the grid, and specify :model in column declaration.")
    end
    main_table = true
    table_name = @table_column_matrix.default_model_class.table_name
  end

  if column
    conditions_generator = ActiveRecordColumnWrapper.new(column, @status[:f], main_table, table_alias, custom_filter_active, filter_type)
    conditions, current_parameter_name = conditions_generator.wg_initialize_request_parameters

    if @status[:f] && conditions.blank?
      @status[:f].delete(current_parameter_name)
    end

    @table_column_matrix.add_condition(column, conditions)
    [column, table_name , main_table]
  else
    nil
  end
end

#distinct_values_for_column(column) ⇒ Object

with this variant we get even those values which do not appear in the resultset



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# File 'lib/wice_grid.rb', line 405

def distinct_values_for_column(column)  #:nodoc:
  res = column.model.select("distinct #{column.name}").order("#{column.name} asc").collect{|ar|
    ar[column.name]
  }.reject{|e| e.blank?}.map{|i|[i,i]}
end

#distinct_values_for_column_in_resultset(messages) ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 412

def distinct_values_for_column_in_resultset(messages)  #:nodoc:
  uniq_vals = Set.new

  resultset_without_paging_without_user_filters.each do |ar|
    v = ar.deep_send(*messages)
    uniq_vals << v unless v.nil?
  end
  return uniq_vals.to_a.map{|i|
    if i.is_a?(Array) && i.size == 2
      i
    elsif i.is_a?(Hash) && i.size == 1
      i.to_a.flatten
    else
      [i,i]
    end
  }.sort{|a,b| a[0]<=>b[0]}
end

#dump_status ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 442

def dump_status #:nodoc:
  "   params: #{params[name].inspect}\n"  +
  "   status: #{@status.inspect}\n" +
  "   ar_options #{@ar_options.inspect}\n"
end

#each ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 328

def each   #:nodoc:
  self.read unless @resultset # database querying is late!
  @resultset.each do |r|
    yield r
  end
end

#empty? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/wice_grid.rb', line 400

def empty?  #:nodoc:
  self.count == 0
end

#filter_params(view_column) ⇒ Object

Getters



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# File 'lib/wice_grid.rb', line 314

def filter_params(view_column)  #:nodoc:
  column_name = view_column.attribute_name_fully_qualified_for_all_but_main_table_columns
  if @status[:f] && @status[:f][column_name]
    @status[:f][column_name]
  else
    {}
  end
end

#filtered_by ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 357

def filtered_by  #:nodoc:
  @status[:f].nil? ? [] : @status[:f].keys
end

#filtered_by?(view_column) ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/wice_grid.rb', line 361

def filtered_by?(view_column)  #:nodoc:
  @status[:f].nil? ? false : @status[:f].has_key?(view_column.attribute_name_fully_qualified_for_all_but_main_table_columns)
end

#filtering_on? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/wice_grid.rb', line 353

def filtering_on?  #:nodoc:
  not @status[:f].blank?
end

#form_ar_options(opts = {}) ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 239

def form_ar_options(opts = {})  #:nodoc:

  return if @ar_options_formed
  @ar_options_formed = true unless opts[:forget_generated_options]

  # validate @status[:order_direction]
  @status[:order_direction] = case @status[:order_direction]
  when /desc/i
    'desc'
  when /asc/i
    'asc'
  else
    ''
  end

  # conditions
  if @table_column_matrix.generated_conditions.size == 0
    @status.delete(:f)
  end

  @ar_options[:conditions] = klass.send(:merge_conditions, @status[:conditions], * @table_column_matrix.conditions )

  # conditions processed

  if (! opts[:skip_ordering]) && @status[:order]
    @ar_options[:order] = add_custom_order_sql(complete_column_name(@status[:order]))

    @ar_options[:order] += ' ' + @status[:order_direction]
  end

  @ar_options[:joins]   = @options[:joins]
  @ar_options[:include] = @options[:include]
  @ar_options[:group]   = @options[:group]

  if self.output_html?
    @ar_options[:per_page] = @status[:per_page]
    @ar_options[:page] = @status[:page]
    @ar_options[:total_entries] = @status[:total_entries] if @status[:total_entries]
  end

end

#get_state_as_parameter_value_pairs(including_saved_query_request = false) ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 365

def get_state_as_parameter_value_pairs(including_saved_query_request = false) #:nodoc:
  res = []
  unless status[:f].blank?
    Wice::WgHash.parameter_names_and_values(status[:f], [name, 'f']).collect do |param_name, value|
      if value.is_a?(Array)
        param_name_ar = param_name + '[]'
        value.each do |v|
          res << [param_name_ar, v]
        end
      else
        res << [param_name, value]
      end
    end
  end

  if including_saved_query_request && @saved_query
    res << ["#{name}[q]", @saved_query.id ]
  end

  [:order, :order_direction].select{|parameter|
    status[parameter]
  }.collect do |parameter|
    res << ["#{name}[#{parameter}]", status[parameter] ]
  end

  res
end

#order_direction ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 349

def order_direction  #:nodoc:
  @status[:order_direction]
end

#ordered_by ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 344

def ordered_by  #:nodoc:
  @status[:order]
end

#ordered_by?(column) ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/wice_grid.rb', line 335

def ordered_by?(column)  #:nodoc:
  return nil if @status[:order].blank?
  if column.main_table && ! offs = @status[:order].index('.')
    @status[:order] == column.attribute
  else
    @status[:order] == column.table_alias_or_table_name + '.' + column.attribute
  end
end

#output_csv? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/wice_grid.rb', line 430

def output_csv? #:nodoc:
  @status[:export] == 'csv'
end

#output_html? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/wice_grid.rb', line 434

def output_html? #:nodoc:
  @status[:export].blank?
end

#process_loading_query ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 173

def process_loading_query #:nodoc:
  @saved_query = nil
  if params[name] && params[name][:q]
    @saved_query = load_query(params[name][:q])
    params[name].delete(:q)
  elsif @options[:saved_query]
    if @options[:saved_query].is_a? ActiveRecord::Base
      @saved_query = @options[:saved_query]
    else
      @saved_query = load_query(@options[:saved_query])
    end
  else
    return
  end

  unless @saved_query.nil?
    params[name] = HashWithIndifferentAccess.new if params[name].blank?
    [:f, :order, :order_direction].each do |key|
      if @saved_query.query[key].blank?
        params[name].delete(key)
      else
        params[name][key] = @saved_query.query[key]
      end
    end
  end
end

#process_params ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 200

def process_params  #:nodoc:
  if this_grid_params
    @status.merge!(this_grid_params)
    @status.delete(:export) unless self.export_to_csv_enabled
  end
end

#read ⇒ Object

TO DO: what to do with other @ar_options values?



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# File 'lib/wice_grid.rb', line 283

def read  #:nodoc:
  form_ar_options
  @klass.unscoped do
    @resultset = if self.output_csv? || all_record_mode?
      # @relation.find(:all, @ar_options)
      @relation.
        includes(@ar_options[:include]).
        joins(   @ar_options[:joins]).
        order(   @ar_options[:order]).
        where(   @ar_options[:conditions])

    else
      # p @ar_options
      @relation.
        page(    @ar_options[:page]).
        per(     @ar_options[:per_page]).
        includes(@ar_options[:include]).
        joins(   @ar_options[:joins]).
        order(   @ar_options[:order]).
        where(   @ar_options[:conditions])

    end
  end
  invoke_resultset_callbacks
end

#with_paginated_resultset(&callback) ⇒ Object

A block executed from within the plugin to process records of the current page. The argument to the callback is the array of the records. See the README for more details.



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# File 'lib/wice_grid.rb', line 162

def with_paginated_resultset(&callback)
  @options[:with_paginated_resultset] = callback
end

#with_resultset(&callback) ⇒ Object

A block executed from within the plugin to process all records browsable through all pages with the current filters. The argument to the callback is a lambda object which returns the list of records when called. See the README for the explanation.



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# File 'lib/wice_grid.rb', line 169

def with_resultset(&callback)
  @options[:with_resultset] = callback
end