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December 16, 2015 20:29
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Backbone Collection extension to maintain hash of models on attributes or user-defined functions
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| class BaseCollection extends Backbone.Collection | |
| initialize: () -> | |
| @_hash_keys = {} | |
| # @hashOn 'last_name', false | |
| # Start hashing on passed in attribute or method on the model that returns a string | |
| # unique indicates whether or not mulitple models in the collection have the same value for this attribute | |
| # If unique is true, we'll keep track of all models with the same value instead of overwriting in the store | |
| hashOn: (key, unique) -> | |
| if undefined == unique | |
| unique = true | |
| @_hash_keys[key] = unique | |
| @_hashModels key, unique | |
| # Clear hash on the key passed in and stop listening in the future | |
| stopHashing: (key) -> | |
| delete @_hash_keys[key] | |
| delete @["_#{key}_hash"] | |
| @stopListening @, 'add reset' | |
| @each (model) => @stopListening model, "change:#{key}" | |
| # key is the attribute originally set via hash_keys(e.g. 'name'), lookup_val is the search term (e.g. 'Frank') | |
| retrieveFromHash: (key, lookup_val) -> | |
| if !key then return [] | |
| # Returns either a single model if attr is unique or an object of models hashed on cid | |
| @["_#{key}_hash"][lookup_val] | |
| _hashModels: (key, unique) -> | |
| @["_#{key}_hash"] = {} | |
| hashSingle = (model) => | |
| hk = if typeof model[key] == 'function' then model[key]() else model.get(key) | |
| if hk | |
| if !unique | |
| # If first key entry, initialize empty object | |
| if !_.has(@["_#{key}_hash"], hk) | |
| @["_#{key}_hash"][hk] = {} | |
| @["_#{key}_hash"][hk][model.cid] = model | |
| else | |
| @["_#{key}_hash"][hk] = model | |
| @listenTo model, "change:#{key}", (m) => | |
| nhk = if typeof m[key] == 'function' then m[key]() else m.get(key) | |
| if !unique | |
| # Remove previous key | |
| delete @["_#{key}_hash"][hk][m.cid] | |
| # Rehash on new key | |
| if !_.has(@["_#{key}_hash"], nhk) | |
| @["_#{key}_hash"][nhk] = {} | |
| @["_#{key}_hash"][nhk] = m unless !nhk | |
| else | |
| # Remove previous key | |
| delete @["_#{key}_hash"][hk] | |
| # Rehash on new key | |
| @["_#{key}_hash"][nhk] = m unless !nhk | |
| @listenTo @, 'add', hashSingle | |
| @listenTo @, 'reset', (collection) => | |
| @["_#{key}_hash"] = {} | |
| _.each(@models, hashSingle, @) | |
| @listenTo @, 'remove', (model) => | |
| hk = if typeof model[key] == 'function' then model[key]() else model.get(key) | |
| if !unique | |
| delete @["_#{key}_hash"][hk][model.cid] | |
| else | |
| delete @["_#{key}_hash"][hk] |
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