Cloud Application Development: CAD Project
A crochet and kintting pattern application where users can store and share links to patterns
- The users can add, delete, edit, and view their added records
- Pattern Recommendation Engine: recommends similar patterns based off difficulty rating and tags (personalized descovery)
- Yarn Usage Calculator: Estimates the total yarn length needed based off the yarn weight (light, medium, or bulky), main stitch type (single crochet, double crochet, knit, purl), and size of the project (small, meduim, or large)
Create App rails new patterns --api cd patterns rails generate scaffold Pattern title:string source:string rating:float difficulty:float made:integer tags:string yarn_weight:string stitch_type:string size:string yarn_estimate:float notes:string link:string user_id:integer rails db:migrate gem install rack-cors
Validations class Pattern < ApplicationRecord # allowes options available_weight = ["lace", "light", "medium", "bulky", "super bulky"].freeze available_stitch = ["single crochet", "double crochet", "half double crochet", "knit", "purl"].freeze available_size = ["small", "medium", "large"].freeze validates :title, presence:true validates :source, presence:true validates :rating, comparison: {greater_than_or_equal_to:0, less_than_or_equal_to:5, message: "Rate for 0 to 5"}, allow_nil: true validates :difficulty, comparison: {greater_than_or_equal_to:0, less_than_or_equal_to:5, message: "Rate for 0 to 5"}, allow_nil: true validates :made, presence:true validates :tags, presence:true validates :yarn_weight, inclusion: { in: available_weight} validates :stitch_type, inclusion: { in: available_stitch} validates :size, inclusion: { in: available_size} validates :notes, length: {minimum: 5} validates :link, presence:true before_validation :calculate_estimated_yarn, if: -> { yarn_weight.present? && stitch_type.present? && size.present? } before_save :normalize_tags scope :search, -> (term) { where("LOWER(title) LIKE :term OR LOWER(tags) LIKE :term", term: "%#{term.downcase}%") } private def calculate_estimated_yarn self.yarn_estimate = YarnCalculator.estimate(yarn_weight, stitch_type, size) end def normalize_tags return if !tags.present? formatted = tags.split(/[, ]+/).map(&:strip).reject(&:empty?).join(", ") self.tags = formatted end end
Library recommendation_system.rb yarn_calculator.rb
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