我有一张非常大的地图，我试图从中获取数据，但我不确定如何访问我想要的值。
%{"attendance" => 20562,
"away" => %{"id" => "583ecb8f-fb46-11e1-82cb-f4ce4684ea4c",
"leaders" => %{"assists" => [%{"full_name" => "Dennis Schroder",
"id" => "a2c6a907-282f-4172-9d60-42d03987da0e",
"jersey_number" => "17", "position" => "G", "primary_position" => "PG",
"statistics" => %{"assists" => 6, "assists_turnover_ratio" => 1.5,
"blocked_att" => 1, "blocks" => 0, "defensive_rebounds" => 1,
"field_goals_att" => 16, "field_goals_made" => 10,
"field_goals_pct" => 62.5, "flagrant_fouls" => 0,
"free_throws_att" => 5, "free_throws_made" => 5,
"free_throws_pct" => 100.0, "minutes" => "32:09",
"offensive_rebounds" => 1, "personal_fouls" => 3, "pls_min" => 3,
"points" => 28, "rebounds" => 2, "steals" => 0, "tech_fouls" => 1,
"three_points_att" => 6, "three_points_made" => 3,
"three_points_pct" => 50.0, "turnovers" => 4, "two_points_att" => 10,
"two_points_made" => 7, "two_points_pct" => 70.0}}],
"points" => [%{"full_name" => "Dennis Schroder",
"id" => "a2c6a907-282f-4172-9d60-42d03987da0e",
"jersey_number" => "17", "position" => "G", "primary_position" => "PG",
"statistics" => %{"assists" => 6, "assists_turnover_ratio" => 1.5,
"blocked_att" => 1, "blocks" => 0, "defensive_rebounds" => 1,
"field_goals_att" => 16, "field_goals_made" => 10,
"field_goals_pct" => 62.5, "flagrant_fouls" => 0,
"free_throws_att" => 5, "free_throws_made" => 5,
"free_throws_pct" => 100.0, "minutes" => "32:09",
"offensive_rebounds" => 1, "personal_fouls" => 3, "pls_min" => 3,
"points" => 28, "rebounds" => 2, "steals" => 0, "tech_fouls" => 1,
"three_points_att" => 6, "three_points_made" => 3,
"three_points_pct" => 50.0, "turnovers" => 4, "two_points_att" => 10,
"two_points_made" => 7, "two_points_pct" => 70.0}}],
"rebounds" => [%{"full_name" => "Dwight Howard",
"id" => "ae8df356-5e57-43e7-be4d-5ec7663312bd", "jersey_number" => "8",
"position" => "C", "primary_position" => "C",
"statistics" => %{"assists" => 2, "assists_turnover_ratio" => 0.67,
"blocked_att" => 0, "blocks" => 3, "defensive_rebounds" => 15,
"field_goals_att" => 5, "field_goals_made" => 3,
"field_goals_pct" => 60.0, "flagrant_fouls" => 0,
"free_throws_att" => 4, "free_throws_made" => 1,
"free_throws_pct" => 25.0, "minutes" => "26:59",
"offensive_rebounds" => 2, "personal_fouls" => 4, "pls_min" => 3,
"points" => 7, "rebounds" => 17, "steals" => 0, "tech_fouls" => 0,
"three_points_att" => 0, "three_points_made" => 0,
"three_points_pct" => 0.0, "turnovers" => 3, "two_points_att" => 5,
"two_points_made" => 3, "two_points_pct" => 60.0}}]},
"market" => "Atlanta", "name" => "Hawks", "points" => 110,
"scoring" => [%{"number" => 1, "points" => 20, "sequence" => 1,
"type" => "quarter"},
%{"number" => 2, "points" => 33, "sequence" => 2, "type" => "quarter"},
%{"number" => 3, "points" => 31, "sequence" => 3, "type" => "quarter"},
%{"number" => 4, "points" => 26, "sequence" => 4, "type" => "quarter"}]},
"clock" => "00:00", "coverage" => "full", "duration" => "2:16",
"home" => %{"id" => "583ec773-fb46-11e1-82cb-f4ce4684ea4c",
"leaders" => %{"assists" => [%{"full_name" => "LeBron James",
"id" => "0afbe608-940a-4d5d-a1f7-468718c67d91",
"jersey_number" => "23", "position" => "F", "primary_position" => "SF",
"statistics" => %{"assists" => 5, "assists_turnover_ratio" => 5.0,
"blocked_att" => 1, "blocks" => 0, "defensive_rebounds" => 7,
"field_goals_att" => 17, "field_goals_made" => 8,
"field_goals_pct" => 47.1, "flagrant_fouls" => 0,
"free_throws_att" => 5, "free_throws_made" => 5,
"free_throws_pct" => 100.0, "minutes" => "36:52",
"offensive_rebounds" => 2, "personal_fouls" => 3, "pls_min" => 7,
"points" => 23, "rebounds" => 9, "steals" => 3, "tech_fouls" => 0,
"three_points_att" => 5, "three_points_made" => 2,
"three_points_pct" => 40.0, "turnovers" => 1, "two_points_att" => 12,
"two_points_made" => 6, "two_points_pct" => 50.0}}],
"points" => [%{"full_name" => "Kyrie Irving",
"id" => "dd146010-902b-4ad7-b98c-650d0363a2f0", "jersey_number" => "2",
"position" => "G", "primary_position" => "PG",
"statistics" => %{"assists" => 4, "assists_turnover_ratio" => 0,
"blocked_att" => 0, "blocks" => 1, "defensive_rebounds" => 1,
"field_goals_att" => 27, "field_goals_made" => 11,
"field_goals_pct" => 40.7, "flagrant_fouls" => 0,
"free_throws_att" => 7, "free_throws_made" => 6,
"free_throws_pct" => 85.7, "minutes" => "39:28",
"offensive_rebounds" => 0, "personal_fouls" => 3, "pls_min" => -4,
"points" => 29, "rebounds" => 1, "steals" => 0, "tech_fouls" => 0,
"three_points_att" => 7, "three_points_made" => 1,
"three_points_pct" => 14.3, "turnovers" => 0, "two_points_att" => 20,
"two_points_made" => 10, "two_points_pct" => 50.0}}],
"rebounds" => [%{"full_name" => "Kevin Love",
"id" => "7d615ccd-db96-42a3-9a6c-7f18ea25634e", "jersey_number" => "0",
"position" => "F", "primary_position" => "PF",
"statistics" => %{"assists" => 3, "assists_turnover_ratio" => 1.5,
"blocked_att" => 2, "blocks" => 0, "defensive_rebounds" => 6,
"field_goals_att" => 17, "field_goals_made" => 7,
"field_goals_pct" => 41.2, "flagrant_fouls" => 0,
"free_throws_att" => 11, "free_throws_made" => 10,
"free_throws_pct" => 90.9, "minutes" => "38:10",
"offensive_rebounds" => 6, "personal_fouls" => 4, "pls_min" => -8,
"points" => 24, "rebounds" => 12, "steals" => 3, "tech_fouls" => 0,
"three_points_att" => 4, "three_points_made" => 0,
"three_points_pct" => 0.0, "turnovers" => 2, "two_points_att" => 13,
"two_points_made" => 7, "two_points_pct" => 53.846}}]},
"market" => "Cleveland", "name" => "Cavaliers", "points" => 106,
"scoring" => [%{"number" => 1, "points" => 20, "sequence" => 1,
"type" => "quarter"},
%{"number" => 2, "points" => 22, "sequence" => 2, "type" => "quarter"},
%{"number" => 3, "points" => 37, "sequence" => 3, "type" => "quarter"},
%{"number" => 4, "points" => 27, "sequence" => 4, "type" => "quarter"}]},
"id" => "35a64e45-75f1-4d7e-a855-37e9051733fc", "lead_changes" => 12,
"neutral_site" => false, "quarter" => 4,
"scheduled" => "2016-11-09T00:00:00+00:00", "status" => "closed",
"times_tied" => 7}
如果你花时间阅读这张地图，我试图让＃34;领导者＆＃34;从它的全名vaule。这是我尝试过的失败。
<%= for boxscore <- @boxscore do %>
<td><%= boxscore["away"]["leaders"]["points"] %></td>
<% end %>
返回此错误：
no function clause matching in Access.get/3
我怎样才能从这张地图中提取领导者值？
答案 0 :(得分：1)
此地图是@boxscore还是boxscore？我在IEx中进行了测试，它确实很好，我的意思是 - boxscore["away"]["leaders"]["points"]做了预期的事情：
[%{"full_name" => "Dennis Schroder",
"id" => "a2c6a907-282f-4172-9d60-42d03987da0e", "jersey_number" => "17",
"position" => "G", "primary_position" => "PG",
"statistics" => %{"assists" => 6, "assists_turnover_ratio" => 1.5,
"blocked_att" => 1, "blocks" => 0, "defensive_rebounds" => 1,
"field_goals_att" => 16, "field_goals_made" => 10,
"field_goals_pct" => 62.5, "flagrant_fouls" => 0, "free_throws_att" => 5,
"free_throws_made" => 5, "free_throws_pct" => 100.0, "minutes" => "32:09",
"offensive_rebounds" => 1, "personal_fouls" => 3, "pls_min" => 3,
"points" => 28, "rebounds" => 2, "steals" => 0, "tech_fouls" => 1,
"three_points_att" => 6, "three_points_made" => 3,
"three_points_pct" => 50.0, "turnovers" => 4, "two_points_att" => 10,
"two_points_made" => 7, "two_points_pct" => 70.0}}]
也许您正在尝试浏览@boxscore，它作为地图而不是列表。因此，您迭代{key, value}对，所以
for boxscore <- @boxscore do
boxscore["away"]["leaders"]["points"]
end
将返回** (FunctionClauseError) no function clause matching in Access.get/3，因为例如。 @boxscore["attendance"]是一个整数，因此Access.get/3将找不到该情况的子句并从上面返回错误。
只需尝试访问@boxscore["away"]["leaders"]["points"] - 甚至更好 - 使用Kernel.get_in/2：
get_in(@boxscore, ["away", "leaders", "points"])