title: How to select one value of a data.frame within a list column with R?
body: <p>I have a data.frame that contains a  type column. The list contains a 1x3 data.frame. I only want one value from this list. Thus will flatten my data.frame so I can write out a csv.</p>
  
  <p>How do I select one item from the nested data.frame (see the 2nd column)? <a href="https://i.stack.imgur.com/c2Rww.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/c2Rww.png" alt="screenshot"></a></p>
  
  <p>Here's the nested col. I'd provide the data but cannot flatten to write_csv.</p>
  
  <p><a href="https://i.stack.imgur.com/gstBb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gstBb.png" alt="enter image description here"></a></p>
  
  <p>result of dput:</p>
  
  <pre><code>structure(list(id = c("1386707", "1386700", "1386462", "1386340", 
  "1386246", "1386300"), fields.created = c("2020-05-07T02:09:27.000-0700", 
  "2020-05-07T01:20:11.000-0700", "2020-05-06T21:38:14.000-0700", 
  "2020-05-06T07:19:44.000-0700", "2020-05-06T06:11:43.000-0700", 
  "2020-05-06T02:26:44.000-0700"), fields.customfield_10303 = c(NA, 
  NA, 3, 3, NA, NA), fields.customfield_28100 = list(NULL, structure(list(
      self = ".../rest/api/2/customFieldOption/76412", 
      value = "New Feature", id = "76412"), .Names = c("self", 
  "value", "id"), class = "data.frame", row.names = 1L), structure(list(
      self = ".../rest/api/2/customFieldOption/76414", 
      value = "Technical Debt", id = "76414"), .Names = c("self", 
  "value", "id"), class = "data.frame", row.names = 1L), NULL, 
      structure(list(self = ".../rest/api/2/customFieldOption/76411", 
          value = "Maintenance", id = "76411"), .Names = c("self", 
      "value", "id"), class = "data.frame", row.names = 1L), structure(list(
          self = ".../rest/api/2/customFieldOption/76412", 
          value = "New Feature", id = "76412"), .Names = c("self", 
      "value", "id"), class = "data.frame", row.names = 1L))), row.names = c(NA, 
  6L), class = "data.frame", .Names = c("id", "fields.created", 
  "fields.customfield_10303", "fields.customfield_28100"))
  </code></pre>