Reselect: Question: How do I get state from within the callback of createSelector?

[dimatter]

I need to call additional selectors from within the selector callback.

[markerikson]

Just add state => state as another input selector?

[dimatter]

that way my selector gets called on ANY state change

[markerikson]

Can you give more info on your specific use case? What's wrong with adding more selectors as input arguments? Why do you need to call selectors _inside_ your new selector?

[dimatter]

state structure

state.commands = immutable.Map of id: immutable.Record
state.packages = immutable.Map of id:  immutable.Record
state.package_commands = immutable.Map of packageId: immutable.List of commandIds

so package_commands is a join table

component structure

packages connect(packagesSelector)
    package connect(packageSelector)
        command_list connect(makeFilteredCommandsForPackage)
           command connect(commandSelector)

above the packages page there is a filter which affects both package & 'command_list' components.

package component needs to know if there are any commands which have not been filtered out.

package.cjsx

{makeFilteredCommandsForPackage,
packageFilterSelector,
packageSelector,
} = require '../selectors'

makeMapStateToProps = (state, props)->
  filteredCommandsForPackage = makeFilteredCommandsForPackage()
  (state, props) ->
    commands: filteredCommandsForPackage state, props
    packageFilter: packageFilterSelector state, props
    pack: packageSelector state, props



class Package extends React.Component
  render: ->
    <CommandList commands={ @props.commands } />

module.exports = connect(makeMapStateToProps) Package

selectors.coffee

commandsForPackageSelector = (state, props) ->
  state.package_commands.get props.packageId

# search query to filter by
packageFilterQuerySelector = (state, props) ->
  packageFilterSelector(state).get 'query'

# here "state" is filtering by command's enabled/disabled state
packageFilterStateSelector = (state) ->
  packageFilterSelector(state).get 'state'

makeFilteredCommandsForPackage = ->
  createSelector [
    packageFilterStateSelector,
    _makeFilteredCommandsForPackage()
  ], (filter, commands) ->
    console.log 'filtering state'
    unless filter is 'all'
      return commands.filter (command) ->
        command.enabled is (filter is 'enabled')
    commands

_makeFilteredCommandsForPackage = ->
  createSelector [
     packageFilterQuerySelector,
     commandsForPackageSelector
  ], (query, commands) ->
      commands = commands.filter (commandId) ->
        # this is the problem... I only have the id of the command
        # I need to retrieve the full command here

[dimatter]

nevermind. can't avoid subscribing to commands...

[pengw00]

Just add state => state as another input selector?

use state as a dependency, will make the selectors expensive!