logo
down
shadow

Rails 4: display values for lookups


Rails 4: display values for lookups

By : Exdata
Date : November 16 2020, 06:23 AM
it fixes the issue I have a polymorphic lookups table that has columns value and display_value. Similar to how HTML select form elements work, the value is what is stored in the DB while the display_value is what is shown on screen to make it look "pretty". , Yes, what you have is most succinct:
code :
read_attribute(:display_value) || value
super || value
class Lookup < ActiveRecord::Base
  DISPLAY_VALUES = {
    # add keys and values
  }

  def display_value
    DISPLAY_VALUES[self.value] || self.value
  end
end


Share : facebook icon twitter icon
Optimizing Lookups: Dictionary key lookups vs. Array index lookups

Optimizing Lookups: Dictionary key lookups vs. Array index lookups


By : mylho
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Don't forget that Big-O notations only says how the complexity grows with respect to the size (etc) - it doesn't give any indication of the constant factors involved. That's why sometimes even a linear search for keys is faster than a dictionary lookup, when there are sufficiently few keys. In this case you're not even doing a search with the array though - just a straight indexing operation.
For straight index lookups, arrays are basically ideal - it's just a case of
code :
pointer_into_array = base_pointer + offset * size
Reduce lookups for rarely changing information in the footer / header in Rails 3

Reduce lookups for rarely changing information in the footer / header in Rails 3


By : OleG
Date : March 29 2020, 07:55 AM
DataReader ordinal-based lookups vs named lookups

DataReader ordinal-based lookups vs named lookups


By : user3022960
Date : March 29 2020, 07:55 AM
To fix this issue Microsoft recommends not calling GetOrdinal within a loop.
That would include indirect calls with the string indexer.
Use a zoo's values as column lookups in another zoo

Use a zoo's values as column lookups in another zoo


By : Aymen Brahim
Date : March 29 2020, 07:55 AM
help you fix your problem You need to first get the "coordinates" of the data points that you want.
match(index(myZoo2), index(myZoo)) will match indices of 2 zoo objects, and match(as.vector(myZoo2), names(myZoo)) will get list of column numbers.
code :
coord <- cbind(match(index(myZoo2), index(myZoo)), match(as.vector(myZoo2), names(myZoo)))

coord
##       [,1] [,2]
##  [1,]    1    3
##  [2,]    2    2
##  [3,]    3    1
##  [4,]    1    2
##  [5,]    2    1
##  [6,]    3    2
##  [7,]    1    3
##  [8,]    2    3
##  [9,]    3    1


zoo(matrix(as.matrix(myZoo)[coord], nrow = nrow(myZoo)), order.by = index(myZoo))
##               
## 1/1/2000 7 4 7
## 1/2/2000 5 2 8
## 1/3/2000 3 6 3
three way lookups to add values to a table

three way lookups to add values to a table


By : user2918401
Date : March 29 2020, 07:55 AM
hop of those help? I am trying to fill out the table 1 with the sales values in table 2. But I keep getting #N/A. , SUMIFS formula is probably the easiest way, it would look like this:
code :
=SUMIFS(Table2[SALES],Table2[ACODE],[@ACODE],Table2[CITY],[@CITY],Table2[DATES],Table1[#Headers])
Related Posts Related Posts :
  • How to implement custom mutating methods in Ruby?
  • Precedence operators in Ruby from Haskell?
  • How to install command line tools on OSX Mavericks
  • When making network requests, when should I use Threads vs Processes?
  • how to call method in one application from another application in ruby on rails
  • LoadError on line ["51"] when trying compass watch command
  • Why does `Dir[directory_path].empty?` return `false` all the time?
  • ruby conjunction and union operators
  • Ruby - watch for file with extension being updated
  • How do I have Ruby YAML dump a Hash subclass as a simple Hash?
  • How do I get ruby-prof to ignore Ruby core / standard library / gem methods?
  • How do I give my instance variable a getter?
  • syntax error, unexpected '=', expecting keyword_end
  • Symbol literal or a method
  • Singleton logger usage in ruby
  • Difficult code packaging design
  • Passing absent parameters
  • Is there a more efficient way of ensuring my database gets closed?
  • Take in escaped input in Ruby command line app
  • String with comma-separated values and newlines: split values and create arrays for each newline
  • Instance variables on Ruby main class
  • How do I cache user specific objects
  • How to specify the location of the chromedriver binary
  • How to setup "application/ld+json" schema.org meta data in rails 4 app
  • How to use String split[]
  • Capture Ruby Logger output for testing
  • Regex group match if present
  • Unusual use of module namespacing
  • Why doesn't this loop stop?
  • How do I run Rails/Rake from another directory?
  • Ruby Tempfile doesn't Create File on Disk
  • Consecutive letter frequency
  • Calling second-level function from the second level in Ruby
  • How do I use a Chef Resource in a Library
  • Ruby Method Name Interpolation
  • Weird behavior of #upcase! in Ruby
  • Ruby array access position in array
  • Ruby NameError: Undefined local variable
  • Using Nokogiri to validate XML: finding the line-nr of validation errors?
  • How to calling a function with arguments in one .rb script to another .rb script
  • Get and clear cookie using rest-client
  • invalid argument creating a ruby dev env with docker & fig
  • How can I better test equality for decorated objects?
  • Replace text in brackets gsub
  • Ruby's Array Combination Method
  • Don't have access to Heroku app
  • Take any hash keys and flatten into mixed array
  • Ruby On Rails Relationship Between Model, View, And Controller
  • Quitting method chain execution early
  • Data scrapping with Nokokiri and Pismo
  • Date format ends before converting entire input string
  • Search for uppercased substring
  • Check params presence in Grape
  • How to create a method that checks if string1 can be rearranged to equal string2?
  • shadow
    Privacy Policy - Terms - Contact Us © ourworld-yourmove.org