bootstrap-vue/src/components/table/helpers/normalize-fields.js

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import { identity } from '../../../utils/identity'
import { isArray, isFunction, isObject, isString } from '../../../utils/inspect'
import { clone, keys } from '../../../utils/object'
import { startCase } from '../../../utils/string'
import { IGNORED_FIELD_KEYS } from './constants'

// Private function to massage field entry into common object format
const processField = (key, value) => {
  let field = null
  if (isString(value)) {
    // Label shortcut
    field = { key, label: value }
  } else if (isFunction(value)) {
    // Formatter shortcut
    field = { key, formatter: value }
  } else if (isObject(value)) {
    field = clone(value)
    field.key = field.key || key
  } else if (value !== false) {
    // Fallback to just key
    /* istanbul ignore next */
    field = { key }
  }
  return field
}

// We normalize fields into an array of objects
// [ { key:..., label:..., ...}, {...}, ..., {..}]
export const normalizeFields = (origFields, items) => {
  const fields = []

  if (isArray(origFields)) {
    // Normalize array Form
    origFields.filter(identity).forEach(f => {
      if (isString(f)) {
        fields.push({ key: f, label: startCase(f) })
      } else if (isObject(f) && f.key && isString(f.key)) {
        // Full object definition. We use assign so that we don't mutate the original
        fields.push(clone(f))
      } else if (isObject(f) && keys(f).length === 1) {
        // Shortcut object (i.e. { 'foo_bar': 'This is Foo Bar' }
        const key = keys(f)[0]
        const field = processField(key, f[key])
        if (field) {
          fields.push(field)
        }
      }
    })
  }

  // If no field provided, take a sample from first record (if exits)
  if (fields.length === 0 && isArray(items) && items.length > 0) {
    const sample = items[0]
    keys(sample).forEach(k => {
      if (!IGNORED_FIELD_KEYS[k]) {
        fields.push({ key: k, label: startCase(k) })
      }
    })
  }

  // Ensure we have a unique array of fields and that they have String labels
  const memo = {}
  return fields.filter(f => {
    if (!memo[f.key]) {
      memo[f.key] = true
      f.label = isString(f.label) ? f.label : startCase(f.key)
      return true
    }
    return false
  })
}