Class: FsPlug

Inherits:
Object
  • Object
show all
Defined in:
lib/obvious/files/external/fs_plug.rb

Instance Method Summary collapse

Constructor Details

#initialize(filename) ⇒ FsPlug

Returns a new instance of FsPlug.



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# File 'lib/obvious/files/external/fs_plug.rb', line 5

def initialize filename
  @filename = filename
end

Instance Method Details

#find(input) ⇒ Object 



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# File 'lib/obvious/files/external/fs_plug.rb', line 81

def find input
  data = []
  query = load_data 
 
  key = input.keys[0] 
 
  query.each do |h|
    if input[key] == h[key]
      return h
    end
  end 

  raise Exception.new 'no object found'
end

#get(input) ⇒ Object 



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# File 'lib/obvious/files/external/fs_plug.rb', line 51

def get input
  data = []
  query = load_data 

  # transform the data if needed
  query.each do |h|
    return h if h[:id] == input[:id]
  end 

  raise Exception.new 'no object found'
end

#list ⇒ Object 



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# File 'lib/obvious/files/external/fs_plug.rb', line 47

def list
  load_data
end

#load_data ⇒ Object 



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# File 'lib/obvious/files/external/fs_plug.rb', line 9

def load_data
  contents = File.read @filename
  JSON.parse contents, :symbolize_names => true
end

#remove(input) ⇒ Object 



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# File 'lib/obvious/files/external/fs_plug.rb', line 63

def remove input
  data = []
  # parse the json list
  query = load_data 

  # transform the data if needed
  query.each do |h|
    unless h[:id] == input[:id]
      data << h 
    end
  end

  save_data data

  # return true on success
  true 
end

#save(input) ⇒ Object 



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# File 'lib/obvious/files/external/fs_plug.rb', line 19

def save input
  data = []
  query = load_data 

  new_element = true if input[:id] == -1 # by convention set new element flag if id == -1

  max_id = -1
  # transform the data if needed
  query.each do |h|
    if input[:id] == h[:id]
      h = input
    end
    max_id = h[:id] if h[:id] > max_id
    data << h
  end

  # add data to the list if it's a new element 
  if new_element 
    input[:id] = max_id + 1
    data << input 
  end

  save_data data

  # return the transformed data
  input
end

#save_data(input) ⇒ Object 



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# File 'lib/obvious/files/external/fs_plug.rb', line 14

def save_data input
  json_data = JSON.pretty_generate input 
  File.open(@filename, 'w') {|f| f.write(json_data) }
end